Bell Boeing V-22 Osprey
|A U.S. Marine Corps MV-22 lands aboard USNS Robert E. Peary as part of exercise Bold Alligator 2012|
|Role||V/STOL military transport aircraft|
|National origin||United States|
Boeing Rotorcraft Systems
|First flight||19 March 1989|
|Introduction||13 June 2007|
|Primary users||United States Marine Corps
United States Air Force
|Number built||200+ as of 2014|
|Program cost||US$35.6 billion after planned procurement of 408 aircraft|
|Developed from||Bell XV-15|
The Bell Boeing V-22 Osprey is an American multi-mission, tiltrotor military aircraft with both a vertical takeoff and landing (VTOL), and short takeoff and landing (STOL) capability. It is designed to combine the functionality of a conventional helicopter with the long-range, high-speed cruise performance of a turboprop aircraft.
The V-22 originated from the United States Department of Defense Joint-service Vertical take-off/landing Experimental (JVX) aircraft program started in 1981. The team of Bell Helicopter and Boeing Helicopters was awarded a development contract in 1983 for the tiltrotor aircraft. The Bell Boeing team jointly produce the aircraft. The V-22 first flew in 1989, and began flight testing and design alterations; the complexity and difficulties of being the first tiltrotor intended for military service in the world led to many years of development.
The United States Marine Corps began crew training for the Osprey in 2000, and fielded it in 2007; it supplemented and then replaced their Boeing Vertol CH-46 Sea Knights. The Osprey's other operator, the U.S. Air Force, fielded their version of the tiltrotor in 2009. Since entering service with the U.S. Marine Corps and Air Force, the Osprey has been deployed in transportation and medivac operations over Iraq, Afghanistan, Libya and Kuwait.
- 1 Development
- 2 Design
- 3 Operational history
- 4 Variants
- 5 Operators
- 6 Notable accidents
- 7 Aircraft on display
- 8 Specifications (MV-22B)
- 9 Notable appearances in media
- 10 See also
- 11 References
- 12 External links
The failure of the Iran hostage rescue mission in 1980 demonstrated to the United States military a need for "a new type of aircraft, that could not only take off and land vertically but also could carry combat troops, and do so at speed." The U.S. Department of Defense began the Joint-service Vertical take-off/landing Experimental (JVX) aircraft program in 1981, under U.S. Army leadership.
The defining mission of the Marine Corps has been to perform an amphibious landing, and they were particularly interested in the JVX program. They realized that a concentrated strike force was vulnerable to a single nuclear weapon, airborne solutions with good speed and range allowed for significant dispersal; and their CH-46s were wearing out; without replacement, the threat of a merger between the Marine Corps and the Army lingered, similar to President Truman's proposal following World War II. The OSD and Navy administration were against the tiltrotor project, but congressional pressure eventually proved persuasive.
The U.S. Navy and Marine Corps were given the lead in 1983. The JVX combined requirements from the U.S. Marine Corps, Air Force, Army and Navy. A request for proposals (RFP) was issued in December 1982 for preliminary design work. Interest was expressed by Aérospatiale, Bell Helicopter, Boeing Vertol, Grumman, Lockheed, and Westland. Contractors were encouraged to form teams. Bell partnered with Boeing Vertol to submit a proposal for an enlarged version of the Bell XV-15 prototype on 17 February 1983. Being the only proposal received, a preliminary design contract was awarded on 26 April 1983.
The JVX aircraft was designated V-22 Osprey on 15 January 1985; by that March, the first six prototypes were being produced, and Boeing Vertol was expanded to deal with the project workload. Work has been split evenly between Bell and Boeing. Bell Helicopter manufactures and integrates the wing, nacelles, rotors, drive system, tail surfaces, and aft ramp, as well as integrates the Rolls-Royce engines and performs final assembly. Boeing Helicopters manufactures and integrates the fuselage, cockpit, avionics, and flight controls. The USMC variant of the Osprey received the MV-22 designation and the U.S. Air Force variant received CV-22; this was reversed from normal procedure to prevent Marine Corps Ospreys from having a conflicting designation with aircraft carriers (CV). Full-scale development of the V-22 tilt-rotor aircraft began in 1986. On 3 May 1986, the Bell Boeing partnership was awarded a $1.714 billion contract for V-22 aircraft by the U.S. Navy. At this point, all four U.S. military services had acquisition plans for V-22 versions.
The first V-22 was rolled out with significant media attention in May 1988. The project suffered several blows. That year, the U.S. Army left the program, citing a need to focus its budget on more immediate aviation programs. In 1989, the project survived two separate votes in the Senate that could have resulted in cancellation. Despite the Senate's decision, the Department of Defense instructed the U.S. Navy not to spend more money on the V-22. When the V-22's projected development budget greatly increased in 1988, Defense Secretary Dick Cheney tried to remove funding from 1989 to 1992 in an effort to cancel it. He was eventually overruled by Congress, which provided unrequested funding for the program. Multiple studies of alternatives found the V-22 provided more capability and combat effectiveness with similar operating costs. The Clinton Administration was supportive of the V-22 and helped it attain funding.
Flight testing and design changes
The first of six MV-22 prototypes first flew on 19 March 1989 in the helicopter mode, and on 14 September 1989 in fixed-wing mode. The third and fourth prototypes successfully completed the Osprey's first sea trials on USS Wasp in December 1990. The fourth and fifth prototypes crashed in 1991–92. From October 1992 – April 1993, Bell and Boeing redesigned the V-22 to reduce empty weight, simplify manufacture, and reduce production costs. This redesigned version became the V-22B model. V-22 flights resumed in June 1993 after safety improvements were incorporated in the prototypes. Bell Boeing was awarded a contract for the engineering manufacturing development (EMD) phase in June 1994. The prototypes also received changes to better match the B-model configuration. Flight testing at the stage focused on expanding the flight envelope, measuring flight loads, and supporting the EMD redesign. This and further flight testing with the early V-22s continued into 1997.
Flight testing of four full-scale development V-22s began in early 1997 when the first pre-production V-22 was delivered to the Naval Air Warfare Test Center, Naval Air Station Patuxent River, Maryland. The first EMD flight took place on 5 February 1997. Testing fell behind schedule. The first of four low rate initial production aircraft, ordered on 28 April 1997, was delivered on 27 May 1999. Osprey number 10 completed the program's second sea trials, this time from USS Saipan in January 1999. During external load testing in April 1999, Boeing used a V-22 to lift and transport the light-weight M777 howitzer.
In 2000, there were two further fatal crashes, killing a total of 19 marines, and the aircraft was again grounded while the cause of these crashes was investigated and various parts were redesigned. As of 2012, changes have been made to the V-22's hardware, software, and procedures in response to hydraulic fires in the nacelles, vortex ring state control issues, and opposed landings.
|V-22 with M777 howitzer|
|Osprey carries M777 howitzer for first time|
The V-22 completed its final operational evaluation in June 2005. The evaluation had included long range deployments, high altitude, desert and shipboard operations, and was deemed successful. The problems identified in various accidents had reportedly been addressed.
U.S. Naval Air Systems Command worked on software upgrades to increase the maximum speed from 250 knots (460 km/h; 290 mph) to 270 knots (500 km/h; 310 mph), increase helicopter mode altitude limit from 10,000 feet (3,000 m) to 12,000 feet (3,700 m) or 14,000 feet (4,300 m), and increase lift performance. Implementation of these upgrades began in September 2011 and proved largely effective.
The V-22's development process has been long and controversial, partly due to its large cost increases, some of which are caused by the requirement to fold wing and rotors to fit aboard ships. The development budget was first planned for $2.5 billion in 1986, which increased to a projected $30 billion in 1988. By 2008, $27 billion had been spent on the program and another $27.2 billion was required to complete planned production numbers. Between 2008 and 2011, the estimated lifetime cost for maintaining the V-22 grew by 61 percent, mostly allocated to maintenance and support.
Its [The V-22's] production costs are considerably greater than for helicopters with equivalent capability—specifically, about twice as great as for the CH-53E, which has a greater payload and an ability to carry heavy equipment the V-22 cannot... an Osprey unit would cost around $60 million to produce, and $35 million for the helicopter equivalent.— Michael E. O'Hanlon, 2002.
In 2001, Lieutenant Colonel Odin Lieberman, commander of the V-22 squadron at Marine Corps Air Station New River, was relieved of duty after allegations that he instructed his unit to falsify maintenance records to make the aircraft appear more reliable. A total of three USMC officers were later implicated as having played a role in the falsification scandal.
In October 2007, Time Magazine ran an article condemning the V-22 as unsafe, overpriced, and completely inadequate; the Marine Corps responded by arguing that parts of the article's data were dated, obsolete, inaccurate, and reflected expectations too high for any new field of aircraft. In 2011, it was reported by the controversial defense industry supported Lexington Institute that the average V-22 mishap rate per flight hour over the past 10 years was approximately half of the average accident rate for the USMC fleet; the V-22's accident rate was the lowest of any Marine rotorcraft. In 2011 Wired Magazine reported that the safety record was achieved by excluding ground incidents; the USMC responded that MV-22 reporting were to the same standards as other aircraft in the Department of the Navy.
By 2012, the USMC reported fleetwide readiness rate had risen to 68 percent; however, the DOD's Inspector General later found 167 of 200 reports had "improperly recorded" information. Captain Richard Ulsh blamed these errors on incompetence and said that they were "not malicious" or deliberate. The required mission capable rate was 82%, but the average was 53% from June 2007 to May 2010. In 2010, Naval Air Systems Command aimed for an 85% reliability rate by 2018. From 2009 to 2014, readiness rates rose 25 percent to the "high 80s," while cost per flight hour had dropped 20 percent to $9,520 through a rigorous maintenance improvement program that focused on diagnosing problems before failures occur. As of 2015[update], although the V-22 requires higher maintenance and has lower availability (62%) than traditional helicopters, it also has a lower incidence rate. The average cost per flight hour is US$9,156, whereas the CH-53E cost about $20,000 per flight hour in 2007. V-22 ownership cost was $83,000 per hour in 2013.
While technically capable of autorotation if both engines fail in helicopter mode, a safe landing is difficult; in 2005, a director of the Pentagon's testing office stated that in a loss of power while hovering below 1,600 feet (490 m), emergency landings "...are not likely to be survivable." V-22 pilot Captain Justin "Moon" McKinney stated that: "We can turn it into a plane and glide it down, just like a C-130." A complete loss of power requires both engines to fail, as one engine can power both proprotors via interconnected drive shafts. Though vortex ring state (VRS) contributed to a deadly V-22 accident, flight testing found the aircraft to be less susceptible to the condition than conventional helicopters. A GAO report stated that the V-22 is "less forgiving than conventional helicopters" during this phenomenon. Several test flights to explore the V-22's VRS characteristics were canceled. The USMC trains pilots in the recognition of and recovery from VRS, and has instituted operational envelope limits and instrumentation to help pilots avoid VRS conditions.
On 28 September 2005, the Pentagon formally approved full-rate production for the V-22, from 11 a year to between 24 and 48 a year by 2012. Of the 458 total planned, 360 are for the U.S. Marine Corps, 48 for the Navy, and 50 for the Air Force at an average cost of $110 million per aircraft, including development costs. The V-22 had an incremental flyaway cost of $67 million per aircraft in 2008, The U.S. Navy had hoped to shave about $10 million off that cost after a five-year production contract in 2013. The cost for each CV-22 was $73 million in the FY 2014 budget.
On 15 April 2010, the Naval Air Systems Command awarded Bell Boeing a $42.1 million contract to design an integrated processor in response to avionics obsolescence and add new network capabilities. By 2014, Raytheon will provide an avionics upgrade that includes Situational awareness and Blue Force Tracking. In late 2009, a contract for Block C upgrades upon the V-22 was awarded to Bell Boeing. In February 2012, the Marine Corps received the first Block C Ospreys; these aircraft feature a new radar, along with additional mission management and electronic warfare equipment. Marines investigate options in 2015 to upgrade all V-22s to C models in order to boost availability.
On 12 June 2013, the U.S. DoD awarded a $4.9 billion contract to Bell and Boeing for 99 V-22s in production Lots 17 and 18, including 92 MV-22s for the Marine Corps. Work is expected to be completed in September 2019. A provision gives NAVAIR the option to order 23 more Ospreys. The combined cost of the June 2013 contract and other associated contracts for the order totaled $6.5 billion.
In 2013, the U.S. was reportedly hoping to sell up to 100 V-22s internationally with up to 15 interested nations identified; prospective customers included Israel, the United Arab Emirates, and Japan. In 2013, Bell began to lay off workers on the V-22 production line following the implementation of defense cuts, which had reduced the US order to about half the originally planned number of aircraft. Production rate went from 40 in 2012 to 22 planned for 2015. Manufacturing robots have replaced older automated machines for increased accuracy and efficiency in production. Large parts are held in place by suction cups and measured electronically. Raw materials arrive frozen.
In March 2014, Air Force Special Operations Command (AFSOC) issued a Combat Mission Need Statement to develop armor to protect V-22 passengers. NAVAIR worked with a Florida-based composite armor company and the Army Aviation Development Directorate to develop and deliver the Advanced Ballistic Stopping System (ABSS) by October 2014. Costing $270,000, the ABSS consists of 66 plates fitting along interior bulkheads and deck, adding 800 lb (360 kg) to the aircraft's weight, affecting payload and unrefueled range. So it can be installed or removed when needed in hours and partially assembled in pieces for partial protection of specific areas. As of May 2015, 16 kits had been delivered to the USAF.
The Osprey is the world's first production tiltrotor aircraft, with one three-bladed proprotor, turboprop engine, and transmission nacelle mounted on each wingtip. It is classified as a powered lift aircraft by the Federal Aviation Administration. For takeoff and landing, it typically operates as a helicopter with the nacelles vertical and rotors horizontal. Once airborne, the nacelles rotate forward 90° in as little as 12 seconds for horizontal flight, converting the V-22 to a more fuel-efficient, higher speed turboprop aircraft. STOL rolling-takeoff and landing capability is achieved by having the nacelles tilted forward up to 45°. Other orientations are possible. It has a ferry range of over 2,100 nmi. Its operational range is 1,100 nmi.
Composite materials make up 43% of the airframe, and the proprotor blades also use composites. For storage, the V-22's rotors fold in 90 seconds and its wing rotates to align, front-to-back, with the fuselage. Due to the requirement for folding rotors, their 38-foot diameter is 5 feet less than optimal for vertical takeoff, resulting in high disk loading. Most missions use fixed wing flight 75% or more of the time, reducing wear and tear and operational costs. This fixed wing flight is higher than typical helicopter missions allowing longer range line-of-sight communications for improved command and control.
Heat from the V-22's engines can potentially damage the flight decks of ships. Naval Air Systems Command (NAVAIR) devised a temporary fix of portable heat shields placed under the engines, and determined that a long-term solution would require redesigning decks with heat resistant coating, passive thermal barriers, and ship structure changes. Similar changes are required for F-35B operations. In 2009, DARPA requested solutions for installing robust flight deck cooling. A heat-resistant anti-skid material called Thermion has been tested on USS Wasp.
In September 2013, Rolls-Royce announced it had increased the AE-1107C engine's power by 17 percent via the adoption of a new Block 3 turbine, an increase in fuel valve flow capacity, and accompanying software updates. The upgrade should increase the reliability in high-altitude, high-heat conditions and boost maximum payload limitations from 6,000 ft to 8,000 ft. A Block 4 upgrade is reportedly being examined, which may increase power by up to 26 percent, producing close to 10,000 hp, and improve fuel consumption.
In August 2014, the U.S. military issued a request for information (RFI) for a potential drop-in replacement for the AE-1107C engines. Submissions must have a power rating of no less than 6,100 shp (4,548.78 kW) at 15,000 rpm, operate at up to 25,000 ft (7,600 m) at up to 130 degrees Fahrenheit (54.4 degrees Celsius), and fit into the existing nacelles on the wings with minimal structural or external modifications. In September 2014, the US Navy was considering contracting for an alternative engine supplier in order to reduce costs. In the V-22 program, the Navy purchases engines separately from the aircraft themselves. The General Electric GE38 has been considered as a replacement, providing commonality with the CH-53K King Stallion.
Either engine can power both proproters through the wing driveshaft. However, the V-22 is generally not capable of hovering on one engine. If a proprotor gearbox fails that proprotor cannot be feathered, and both engines must be stopped before an emergency landing. The aircraft's autorotation characteristics are poor partly because the rotors have low inertia.
The V-22 has a maximum rotor downwash speed above 80 knots, more than the 64 knots lower limit of a hurricane. The rotorwash usually prevents usage of the starboard door in hover, instead the rear ramp is used for rappelling and hoisting. Boeing has stated the V-22 design loses 10 percent of its vertical lift over a tiltwing design when operating in helicopter mode because of airflow resistance due to the wings, but that the tiltrotor design has better short takeoff and landing performance. A V-22 must maintain at least 25 ft (7.6 m) of vertical separation between each other to avoid their rotor wake, which can cause turbulence and potentially lead to a loss of control.
The V-22 is equipped with a glass cockpit, which incorporates four Multi-function displays (MFDs, compatible with night-vision goggles) and one shared Central Display Unit (CDU), to display various images including: digimaps, imagery from the Turreted Forward Looking Infrared System primary flight instruments, navigation (TACAN, VOR, ILS, GPS, INS), and system status. The flight director panel of the Cockpit Management System (CMS) allows for fully coupled (autopilot) functions that take the aircraft from forward flight into a 50 ft (15 m) hover with no pilot interaction other than programming the system. The glass cockpit of the canceled CH-46X was derived from the V-22. The fuselage is not pressurized, and personnel must wear on-board oxygen masks above 10,000 feet.
The V-22 has triple-redundant fly-by-wire flight control systems. The aircraft also has computerized damage control that automatically isolates damaged elements. With the nacelles pointing straight up in conversion mode at 90° the flight computers command the aircraft to fly like a helicopter, with cyclic forces being applied to a conventional swashplate at the rotor hub. With the nacelles in airplane mode (0°) the flaperons, rudder, and elevator fly the aircraft like an airplane. This is a gradual transition and occurs over the rotation range of the nacelles. The lower the nacelles, the greater effect of the airplane-mode control surfaces. The nacelles can rotate past vertical to 97.5° for rearward flight. The V-22 can use the "80 Jump" orientation with the nacelles at 80° for takeoff to quickly achieve high altitude and speed. Aspects of the V-22's flight are automated and simplified by the control system such that the V-22 can hover (in low wind) with no hands on the controls. According to some who have flown the aircraft, former fixed-wing pilots may be preferable because they (unlike those with helicopter experience) are not trained to constantly adjust the controls while hovering.
The Osprey can be armed with one 7.62×51mm NATO (.308 in caliber) M240 machine gun or .50 in caliber (12.7 mm) M2 machine gun on the loading ramp, that can be fired rearward when the ramp is lowered. A .50 in GAU-19 three-barrel Gatling gun mounted below the V-22's nose was studied for future upgrade. BAE Systems developed a belly-mounted, remotely operated gun turret system for the V-22, named the Interim Defense Weapon System (IDWS). The IDWS is remotely operated by a gunner inside the aircraft, who acquires targets via a separate pod using color television and forward looking infrared imagery. The IDWS was installed on half of the first V-22s deployed to Afghanistan in 2009, but found limited use due to its 800 lb (360 kg) weight and restrictive rules of engagement.
There were 32 IDWSs available to the Marine Corps in June 2012. The system had not been fired in combat as V-22s were routinely escorted by helicopter gunships and close air support aircraft, allowing them to focus on their transport role; squadrons also often flew without the belly gun, as the added weight reduced its cargo-carrying capacity. The Osprey's speed means it can outrun supporting conventional helicopters, requiring a self-defense capability on long-range missions and operate independently. The infrared gun camera has proven valuable for reconnaissance and surveillance. Other weapons are being studied to provide an all-quadrant defensive weapon system including nose guns, door guns, and nonlethal countermeasures to work with the current ramp-mounted machine gun and the IDWS.
In 2014, the USMC revealed plans for new V-22 weapons "to increase all-axis, stand-off, and precision capabilities", which may be potentially operated by additional crew members. Armament increases are for enhanced offensive capabilities to special purpose Marine rapid crisis response task forces, rather than as an attack platform. The V-22 could be adapted for various precision weapons, including the AGM-114 Hellfire, AGM-176 Griffin, Joint Air-to-Ground Missile, and GBU-53/B SDB II. Fuselage-based hardpoints for the weapons would be used to clear the proprotors. In November 2014, Bell and Boeing conducted self-funded weapons tests using a V-22 equipped with a small pylon on the front port-side fuselage and the AN/AAQ-27A EO camera replaced with an L-3 Wescam MX-15 sensor/laser designator. 26 unguided Hydra 70 rockets, two guided APKWS rockets, and two Griffin B missiles were fired over five flights. The USMC and USAF seek a traversable nose-mounted weapon connected to a helmet-mounted sight; recoil would complicate integrating a desired forward-facing gun. A weapons pylon on either side of the fuselage can carry 300 lb (140 kg) of munitions.
Boeing is developing a roll-on/roll-off aerial refueling kit, which would give the V-22 the ability to refuel other aircraft. Having an aerial refueling capability that can be based off Wasp-class amphibious assault ships would increase the striking power of Marine F-35Bs, as they would not rely on refueling assets that could only be based on full-sized Nimitz-class aircraft carriers or from land bases. The roll-on/roll-off kit can also be applicable to intelligence, surveillance, and reconnaissance functions. Boeing funded a non-functional demonstration on a VMX-22 aircraft; a prototype kit was successfully tested with an F/A-18 on 5 September 2013.
The high-speed version of the hose/drogue refueling system is designed to be deployed at 185 kn (213 mph; 343 km/h) and function at up to 250 kn (290 mph; 460 km/h). Onboard tanks and a roll-on/roll-off bladder can contain up to 12,000 lb (5,400 kg) of fuel. The operator must open the ramp to extend the refueling hose, then raise the ramp once extended, with the top ramp door left open. The V-22 could refuel rotary-wing aircraft, but it would require a separate drogue used specifically by helicopters and a partially converted nacelle. Bell and Boeing are hoping for funding for additional testing to include contact between the refueler and receiver and eventually the passage of fuel. Since many Marine Corps ground vehicles can run on aviation fuel, a refueling V-22 could also service them. In late 2014, it was stated that such tankers could be operational by 2017. As of 2015, the Navy has no immediate plans to use the V-22 Aerial Refueling System (VARS) on its planned COD fleet, but it may be leveraged in the future.
U.S. Marine Corps
Since March 2000, VMMT-204 has conducted Marine Corps crew training for the V-22. On 3 June 2005, Marine Corps helicopter squadron Marine Medium Helicopter 263 (HMM-263) stood down to transition to the MV-22. On 8 December 2005, Lieutenant General James Amos, commander of II Marine Expeditionary Force, accepted delivery of the first fleet of MV-22s, delivered to HMM-263. The unit reactivated on 3 March 2006 as the first MV-22 squadron, redesignated as VMM-263. On 23 March 2007, HMM-266 became Marine Medium Tiltrotor Squadron 266 (VMM-266) at Marine Corps Air Station New River, North Carolina.
The MV-22 reached initial operational capability (IOC) with the U.S. Marine Corps on 13 June 2007. The Osprey has been replacing the CH-46 Sea Knight since 2007; the Sea Knight was retired in October 2014. On 10 July 2007, an MV-22 landed aboard the Royal Navy aircraft carrier HMS Illustrious, the first time a V-22 had landed on a non-U.S. vessel.
On 13 April 2007, the Marine Corps announced the first V-22 combat deployment at Al Asad Airbase, Iraq. On 17 September 2007, 10 MV-22Bs of VMM-263 left for Iraq aboard USS Wasp. The decision to use a ship instead of self-deploying was made because of concerns over icing during the North Atlantic portion of the trip, lack of available KC-130s for mid-air refueling, and the Wasp's availability.
On arrival, they were used in Iraq's western Anbar province for cargo and troop movements, as well as riskier "aero-scout" missions. General David Petraeus, the top U.S. military commander in Iraq, used one to visit troops around Iraq on Christmas Day 2007; as did then-presidential candidate Barack Obama during his 2008 tour of Iraq. Obtaining spare parts proved problematic. By July 2008, the V-22 had flown 3,000 sorties totaling 5,200 hours in Iraq. General George J. Trautman, III praised the V-22's increased speed and range over legacy helicopters, stating that "it turned his battle space from the size of Texas into the size of Rhode Island." Through 2009, V-22s had been fired upon several times by man-portable air-defense systems, and small arms with none lost to enemy fire.
A Government Accountability Office study reported that by January 2009, 12 MV-22s were operating in Iraq and they completed all assigned missions; mission capable rates averaged 57% to 68%, and an overall full mission capable rate of 6%. The report also stated that the aircraft had shown weakness in situational awareness, maintenance, shipboard operations and transport capability. The study concluded that "...deployments confirmed that the V-22’s enhanced speed and range enable personnel and internal cargo to be transported faster and farther than is possible with the legacy helicopters it is replacing."
The MV-22 deployed to Afghanistan in November 2009 with VMM-261, and saw its first offensive combat mission, Operation Cobra's Anger, on 4 December 2009. Ospreys assisted in inserting 1,000 Marines and 150 Afghan troops into the Now Zad Valley of Helmand Province in southern Afghanistan to disrupt Taliban communication and supply lines. On 18 February 2011, Marine Commandant General James Amos indicated MV-22s deployed to Afghanistan had surpassed 100,000 flight hours and were noted as "the safest airplane, or close to the safest airplane” in the Marine Corps inventory.
In January 2010, the MV-22 was sent to Haiti as part of Operation Unified Response relief efforts after the earthquake there, the type's first humanitarian mission. In March 2011, two MV-22s from Kearsarge participated in a mission to rescue a downed USAF F-15E crew member during Operation Odyssey Dawn. On 2 May 2011, following Operation Neptune's Spear, the body of Osama bin Laden, founder of the al-Qaeda terrorist group, was flown by a MV-22 to the aircraft carrier Carl Vinson in the Northern Arabian Sea, prior to his burial at sea.
In 2013, several MV-22s received communications and seating modifications to support the Marine One presidential transport squadron due to the urgent need for CH-53Es in Afghanistan. On 11 August 2013, two MV-22s from Marine Helicopter Squadron One (HMX-1) made their debut ferrying Secret Service agents, White House staff, and press members from CGAS Cape Cod to Martha's Vineyard during the President's vacation. In May 2010, Boeing announced plans to submit the V-22 for the VXX presidential transport replacement.
Several Japanese politicians and Okinawa residents opposed a V-22 deployment to Japan in July 2012, mainly due to several high-profile accidents. On 14 June 2013, an MV-22 landed on the JDS Hyūga off the coast of California, the first time a V-22 had landed on a Japan Maritime Self-Defense Force vessel. In January 2014, a MV-22 landed aboard the French Mistral-class amphibious assault ship Dixmude. A Marine MV-22 landed on the ROKS Dokdo (LPH-6111) on 26 March 2015, marking the first landing of an Osprey on a Republic of Korea Navy amphibious ship.
From 2–5 August 2013, two MV-22s completed the longest distance Osprey tanking mission to date. Flying from Marine Corps Air Station Futenma in Okinawa alongside two KC-130J tanker aircraft, the Ospreys flew to Clark Air Base in the Philippines on 2 August, then to Darwin, Australia on 3 August, Townsville, Australia on 4 August, and finally rendezvoused with Bonhomme Richard on 5 August.
In 2013, the USMC formed an intercontinental response force, the Special Purpose Marine Air-Ground Task Force - Crisis Response - Africa (SPMAGTF-CR-AF), equipped with V-22s outfitted with specialized communications equipment. In 2013, following Typhoon Haiyan, 12 MV-22s of the 3rd Marine Expeditionary Brigade were deployed to the Philippines for disaster relief operations. The V-22's capabilities were described as "uniquely relevant", being able to fly faster and with greater payload while moving essential supplies to remote sites throughout the island archipelago.
The V-22 deployment to Afghanistan was set to conclude in late 2013 with the drawdown of combat operations; however VMM-261 was directed to extend operations for a new role, casualty evacuation, for which it was better suited than helicopters as its speed better enabled casualties to reach a hospital within the 'golden hour'; they were fitted with medical equipment such as heart-monitors and basic triage supplies.
In November 2014, three MV-22Bs were placed on alert at Al Jaber Air Base in Kuwait to be ready within 30 minutes to recover downed pilots during the Military intervention against ISIL. On 29 occasions between 1 November and 24 April 2015, two Ospreys and a KC-130J aerial tanker assigned to this Tactical Recovery of Aircraft and Personnel (TRAP) mission spent 145 flight hours loitering, ready to perform rescue missions if required. The only pilot that was downed was a Jordanian, but he did not have a radio on him when he ejected and landed too close to ISIL forces.
U.S. Air Force
The Air Force's first operational CV-22 was delivered to the 58th Special Operations Wing (58th SOW) at Kirtland Air Force Base, New Mexico on 20 March 2006. This and subsequent aircraft became part of the 58th SOW's fleet of aircraft used for training pilots and crew members for special operations use. On 16 November 2006, the Air Force officially accepted the CV-22 in a ceremony conducted at Hurlburt Field, Florida. The Air Force first used the V-22 on a non-training mission to perform search and rescue from Kirtland Air Force Base on 4 October 2007.
The U.S. Air Force's first operational deployment of the Osprey sent four CV-22s to Mali in November 2008 in support of Exercise Flintlock. The CV-22s flew nonstop from Hurlburt Field, Florida with in-flight refueling. AFSOC declared that the 8th Special Operations Squadron reached Initial Operational Capability on 16 March 2009, with six CV-22s in service.
In June 2009, CV-22s of the 8th Special Operations Squadron delivered 43,000 pounds (20,000 kg) of humanitarian supplies to remote villages in Honduras that were not accessible by conventional vehicles. In November 2009, the 8th SO Squadron and its six CV-22s returned from a three-month deployment in Iraq.
In August 2012, the USAF found that "CV-22 wake modeling is inadequate for a trailing aircraft to make accurate estimations of safe separation from the preceding aircraft."
On 21 December 2013, three CV-22s came under small arms fire while on a mission to evacuate American civilians in Bor, South Sudan during the 2013 South Sudanese political crisis. The three aircraft were damaged and four crew wounded; the mission was aborted and the aircraft flew 500 mi (800 km) to Entebbe, Uganda. South Sudanese officials stated that the attackers were rebels. The CV-22s, of the 8th Special Operations Squadron, had flown to Bor over three countries across 790 nmi (910 mi; 1,460 km). The formation was hit 119 times, causing flight control failures and hydraulic and fuel leaks on all three aircraft. Due to fuel leaks, multiple air-to-air refuelings were performed en route. Following the South Sudan incident, AFSOC developed optional armor floor panels for the V-22.
On 3 July 2014, V-22 aircraft carried Delta Force commandos to a campsite in eastern Syria where Islamic State militants had held American and other hostages. The commandos quickly eliminated the militants at the site, but found that the hostages had been moved elsewhere and returned home empty handed.
The Air Force is looking to configure the CV-22 to perform combat search and rescue in addition to its primary long-range special operations transport mission. The Osprey would act as a complement to Air Force HH-60G Pave Hawk and planned HH-60W rescue helicopters, being employed in scenarios were its ability to cover more ground quickly would be better suited to search and rescue than more nimble but slower helicopters.
The United States Navy could potentially employ the V-22 in search and rescue, transport and anti-submarine warfare roles. The V-22 program included navy 48 HV-22s, but none have been ordered. One proposal is to replace the C-2 Greyhound with the V-22 for Carrier Onboard Delivery duties. One specific advantage of the V-22 in this role is the ability to deliver supplies and people between non-carriers ships beyond helicopter range. A MV-22 landed and refueled onboard Nimitz as part of an evaluation for COD in October 2012. Further cargo handling trials took place in 2013 on Harry S. Truman.
V-22 proponents have said that it is capable of similar speed, payload capacity and lift performance as the C-2, the V-22 can also carry greater payloads over short ranges; up to 20,000 lb, and can also carry suspended external loads. The C-2 can only land on carriers, requiring further distribution to smaller vessels via helicopters; the Osprey has been certified for operating upon amphibious ships, aircraft carriers, and logistics ships. The V-22 could also take the roles of some helicopters, with a 600 lb hoist fitted to the ramp and a cabin configuration for 12 non-ambulatory patients and five seats for medical attendants. Boeing designed a special frame for the V-22 to carry the Lockheed Martin F-35's F135 engine to ships. Bell and Boeing have pitched the V-22 to the Navy as a platform for various missions, such as communications, electronic warfare, or aerial refueling; the Navy have a known gap in tactical aerial refueling, currently handled by Marine KC-130s, Air Force KC-10 Extenders, and KC-135 Stratotankers with hose-and-drogue delivery systems.
On 5 January 2015, the Navy and Marines signed a memorandum of understanding (MOU) to buy the V-22 for the COD mission, and was confirmed in the Navy's FY 2016 budget. Designated HV-22, four aircraft would be initially bought each year from 2018–2020. The Navy's variant will incorporate an extended-range fuel system, a high-frequency radio for over-the-horizon communications, and a public address system to communicate with passengers. While the MV-22 has a range of 428 nmi (493 mi; 793 km) when carrying 24 Marines, the Navy has a requirement for an 1,150 nmi (1,320 mi; 2,130 km) unrefueled range a lower passenger/payload capacity.
The Indian Aviation Research Centre (ARC) is interested in acquiring four V-22 Ospreys for the purposes of personnel evacuation in hostile conditions, logistic supplies, and deployment of the Special Frontier Force (SFF) on the border. India had seen the Osprey's utility in relief operations of the April 2015 Nepal earthquake. The deal could be worth some $300 million. Elements of the Indian Navy have also looked at the V-22 rather than the E-2D for Airborne early warning and control to replace the short-range Kamov Ka-31.
Israel has shown interest in the V-22. In 2009, Israel reportedly favored the Sikorsky CH-53K over the V-22. In 2011, Israel was interested in using the V-22 to support special operations and search & rescue missions. In 2013, Israel was reportedly interested in a possible lease of six to eight aircraft for special operations missions; the type is not to act as a replacement for existing rotorcraft.
On 22 April 2013, an agreement was finalized to sell the V-22 to the Israel Air Force. The Israeli aircraft are to be moved to the front of the production queue, jumping ahead of some USMC deliveries. They were expected to arrive as early as 2015. These aircraft are to be optimized for special operations and rescue missions. Israel is interested in doubling the purchase from six MV-22B Ospreys to 12 aircraft. The initial order of six aircraft could cost up to $1.13 billion including additional equipment and support. In October 2014, media reports indicated that Israel is deferring or canceling its procurement of the V-22 due to budget restraints and changing policies. However, although the Letter of Agreement offering a $400 million discount and early delivery formally expired, the deal is still on and the Defense Minister decided to wait until elections form a new cabinet in March 2015 to push for cabinet approval for it.
In 2012, former Defense Minister Satoshi Morimoto ordered an investigation of the costs of V-22 operations. The V-22 exceeds current Japan Self-Defense Forces helicopters in terms of range, speed, and payload. The ministry anticipates deployments to the Nansei Islands and the Senkaku Islands, as well as in multinational cooperation with the U.S. Japan is considering plans to have V-22s in service in a maritime role by as early as 2015. On 21 November 2014, the Japanese Ministry of Defense officially decided to procure 17 V-22s, with deliveries planned from FY 2014 to FY 2019. In January 2015, Japan's parliament approved a defense budget with funding for five V-22s.
In February 2015, the South Korean Army showed interest in the V-22 for delivering special forces to islands in the Yellow Sea near North Korean territory; talks are to be held during 2015 on a possible Osprey buy.
United Arab Emirates
In May 2012, it was reported that the United Arab Emirates was in the final negotiation stages to purchase several V-22s. The UAE intends to use the Osprey to support special forces. Both UAE and the Pentagon seek a $58 million unit cost. On 10 November 2015, UAE selected an AW609 variant for search and rescue use and denies negotiations on the V-22.
- Pre-production full-scale development aircraft used for flight testing. These are unofficially considered A-variants after the 1993 redesign.
- U.S. Air Force variant for the U.S. Special Operations Command (USSOCOM). It conducts long-range special operations missions, and is equipped with extra wing fuel tanks, an AN/APQ-186 terrain-following radar, and other equipment such as the AN/ALQ-211, and AN/AAQ-24 Nemesis Directional Infrared Counter Measures. The fuel capacity is increased by 588 gallons (2,230 L) with two inboard wing tanks; three auxiliary tanks (200 or 430 gal) can also be added in the cabin. The CV-22 replaced the MH-53 Pave Low.
- U.S. Marine Corps variant. The Marine Corps is the lead service in the V-22's development. The Marine Corps variant is an assault transport for troops, equipment and supplies, capable of operating from ships or expeditionary airfields ashore; replacing the Marine Corps' CH-46E and CH-53D fleets.
- Proposed airborne early warning and control variant. The Royal Navy studied this AEW variant as a replacement for its current fleet of carrier-based Sea King ASaC.7 helicopters.
- The U.S. Navy considered an HV-22 to provide combat search and rescue, delivery and retrieval of special warfare teams along with fleet logistic support transport. It chose the MH-60S for this role in 2001. Naval Air Systems Command's 2011/2012 V-22 Osprey Guidebook lists the HV-22 for the U.S. Navy with the USAF and USMC variants.
- The proposed anti-submarine warfare variant. The U.S. Navy studied the SV-22 in the 1980s to replace S-3 and SH-2 aircraft.
- United States Air Force
- United States Marine Corps
The V-22 Osprey has had seven hull-loss accidents with a total of 36 fatalities. During testing from 1991 to 2000, there were four crashes resulting in 30 fatalities. Since becoming operational in 2007, the V-22 has had three crashes resulting in six fatalities, and several minor incidents. The aircraft's accident history has generated some controversy over its perceived safety issues.
Aircraft on display
- The third of six V-22A prototypes is on display at the American Helicopter Museum & Education Center in West Chester, Pennsylvania.
- CV-22B 99-021 – National Museum of the United States Air Force at Wright-Patterson AFB in Dayton, Ohio.
- Crew: Four (pilot, copilot and two flight engineers/crew chiefs)
- Length: 57 ft 4 in (17.5 m)
- Rotor diameter: 38 ft 0 in (11.6 m)
- Wingspan: 45 ft 10 in (14 m)
- Width with rotors: 84 ft 7 in (25.8 m)
- Height: 22 ft 1 in/6.73 m; overall with nacelles vertical (17 ft 11 in/5.5 m; at top of tailfins)
- Disc area: 2,268 ft² (212 m²)
- Wing area: 301.4 ft² (28 m²)
- Empty weight: 33,140 lb (15,032 kg)
- Loaded weight: 47,500 lb (21,500 kg)
- Max. takeoff weight: 60,500 lb (27,400 kg) (self-deploy/long runway)
- Maximum speed: 275 knots (509 km/h, 316 mph) at sea level / 305 kn (565 km/h; 351 mph) at 15,000 ft (4,600 m)
- Cruise speed: 241 kn (277 mph, 446 km/h) at sea level
- Stall speed: 110 kn (126 mph, 204 km/h) in airplane mode
- Range: 879 nmi (1,011 mi, 1,627 km)
- Combat radius: 390 nmi (426 mi, 722 km)
- Ferry range: 1,940 nmi (2,230 mi, 3,590 km) with auxiliary internal fuel tanks
- Service ceiling: 25,000 ft (7,620 m)
- Rate of climb: 2,320–4,000 ft/min (11.8 m/s)
- Glide ratio: 4.5:1
- Disc loading: 20.9 lb/ft² at 47,500 lb GW (102.23 kg/m²)
- Power/mass: 0.259 hp/lb (427 W/kg)
- 1× 7.62 mm (0.308 in) M240 machine gun or 0.50 in (12.7 mm) M2 Browning machine gun on ramp, removable
- 1× 7.62 mm (.308 in) GAU-17 minigun, belly-mounted, retractable, video remote control in the Remote Guardian System [optional]
Notable appearances in media
(For V-22 appearances in fiction, and for fictional V-22-based aircraft, respectively.)
- Related development
- Aircraft of comparable role, configuration and era
- Related lists
- "Osprey Deemed Ready for Deployment." U.S. Marine Corps, 14 June 2007.
- Berard, Yamil. "Bell to lay off 325 workers as V-22 orders decline". Fort Worth Star-Telegram, 5 May 2014. Accessed: 8 May 2014.
- "V-22 Osprey Backgrounder." Boeing Defense, Space & Security, February 2010. Retrieved: 26 March 2010.
- Kreisher, Otto. "Finally, the Osprey." Air Force magazine, February 2009.
- Whittle 2010, p. 62.
- Mackenzie, Richard (writer). "Flight of the V-22 Osprey" (Television production). Mackenzie Productions for Military Channel, 7 April 2008. Retrieved: 29 March 2009.
- Norton 2004, p. 35.
- Whittle 2010, p. 55.
- Whittle 2010, p. 91.
- Whittle 2010, p. 87: "As Kelly saw it, the future of the Marine Corps was riding on it."
- Whittle 2010, p. 155.
- Whittle 2010, pp. 53, 55–56.
- Scroggs, Stephen K. "Army Relations with Congress : Thick Armor, Dull Sword, Slow Horse" page 232. Greenwood Press, 2000. ISBN 9780313019265.
- Moyers, Al (Director of History and Research). "The Long Road: AFOTEC's Two-Plus Decades of V-22 Involvement." Headquarters Air Force Operational Test and Evaluation Center, United States Air Force, 1 August 2007. Retrieved: 30 December 2010.
- "Chapter 9: Research, Development, and Acquisition." Department of the Army Historical Summary: FY 1982. Center of Military History (CMH), United States Army, 1988. ISSN 0092-7880.
- Norton 2004, pp. 22–30.
- "AIAA-83-2726, Bell-Boeing JVX Tilt Rotor Program." American Institute of Aeronautics and Astronautics (AIAA), 16–18 November 1983.
- Norton 2004, pp. 31–33.
- Kishiyama, David. "Hybrid Craft Being Developed for Military and Civilian Use." Los Angeles Times, 31 August 1984.
- Adams, Lorraine. "Sales Talk Whirs about Bell Helicopter." Dallas Morning News,10 March 1985.
- "Boeing Vertol launches Three-Year, $50 Million Expansion Program." Philadelphia Inquirer, 4 March 1985.
- "Military Aircraft: The Bell-Boeing V-22." Bell Helicopter, 2007. Retrieved: 30 December 2010.
- Norton 2004, p. 30.
- RL31384, "V-22 Osprey Tilt-Rotor Aircraft: Background and Issues for Congress." Congressional Research Service, 22 December 2009.
- Goodrich, Joseph L. "Bell-Boeing team lands contract to develop new tilt-rotor aircraft, 600 jobs expected from $1.714-billion project for Navy." Providence Journal, 3 May 1986.
- Belden, Tom. "Vertical-takeoff plane may be the 21st century's intercity bus." Toronto Star, 23 May 1988.
- "Tilt-rotor craft flies like copter, plane." Milwaukee Sentinel, 24 May 1988.
- "2 Senators key to fate of Boeing's V-22 Osprey." Philadelphia Inquirer, 6 July 1989.
- Mitchell, Jim. "Gramm defends Osprey's budget cost: Senator makes pitch for V-22 as president stumps for B-2 bomber." Dallas Morning News, 22 July 1989.
- "Pentagon halts spending on V-22 Osprey." Chicago Tribune, 3 December 1989.
- Berler, Ron. "Saving the Pentagon's Killer Chopper-Plane." Wired (CondéNet, Inc), Volume 13, Issue 7, July 2005. Retrieved: 8 February 2008.
- Norton 2004, p. 49.
- Norton 2004, p. 52.
- "Revolutionary plane passes first test." Toledo Blade, 20 March 1989.
- Mitchell, Jim. "V-22 makes first flight in full airplane mode." Dallas Morning News, 15 September 1989.
- Jones, Kathryn. "V-22 tilt-rotor passes tests at sea." Dallas Morning News, 14 December 1990.
- "Navy halts test flights of V-22 as crash investigated." Fort Worth Star-Telegram, 13 June 1991.
- Norton 2004, pp. 52–54.
- Norton 2004, p. 55.
- Norton 2004, pp. 55–57.
- Schinasi 2008, p. 23.
- "M777: He Ain’t Heavy, He’s my Howitzer." Defense Industry Daily, 18 July 2012. Retrieved: 22 July 2012.
- "Lots Riding on V-22 Osprey" Defense Industry Daily, 12 March 2007. Retrieved: 22 July 2012.
- Pappalardo, Joe. "The Osprey's Real Problem Isn't Safety—It's Money." Popular Mechanics, 14 June 2012.
- Chavanne, Bettina H. "V-22 To Get Performance Upgrades." Aviation Week, 25 June 2009.
- "Software Change Gives V-22 Pilots More Lift Options." thebaynet.com. Retrieved: 24 April 2012.
- Capaccio, Tony. "V-22 Osprey Aircraft’s Reliability Improves in Pentagon Testing." Bloomberg News, 13 January 2012.
- Tony Osborne (12 November 2015). "V-22 Osprey Testing Could Lead To Higher Takeoff Weights". Aviation Week.
- Bryce, Robert. "Review of political forces that helped shape V-22 program." Texas Observer, 17 June 2004.
- Whittle, Richard. "Half-airplane, half-helicopter, totally badass" NY Post, 24 May 2015. Archived on 25 May 2015.
- Capaccio, Tony. "Lifetime cost of V-22s rose 61% in three years." Bloomberg News, 29 November 2011.
- O'Hanlon 2002, p. 119.
- Ricks, Thomas E. "Marines Fire Commander Of Ospreys; Alleged Falsification Of Data Investigated." Washington Post, 19 January 2001. Retrieved: 8 August 2011.
- Thompson, Mark. "V-22 Osprey: A Flying Shame." Time, 26 September 2007. Retrieved: 8 August 2011.
- Hoellwarth, John. "Leaders, experts slam Time article on Osprey." Marine Corps Times (Army Times Publishing Company), 16 October 2007. Retrieved: 8 August 2011.
- DiMascio, Jen (December 9, 2010). "Playing defense – but at a price?". Politico.
- Ackerman, Spencer (April 12, 2012). "Defense Industry's Favorite Think Tank Daydreams of Obama Defeat". Wired (magazine).
- Silverstein, Ken (April 1, 2010). "Mad men – Introducing the defense industry's pay-to-play ad agency". Harper's Magazine.
- "V-22 Is The Safest, Most Survivable Rotorcraft The Marines Have." LexingtonInstitute.org, February 2011. Retrieved: 16 February 2011.
- Axe, David. "Marines: Actually, Our Tiltrotor Is ‘Effective And Reliable’ (Never Mind Those Accidents)." Wired, 13 October 2011.
- "USMC Statement in Response to Article on the Safety Record of the Marine V-22 Osprey." USMC, 13 October 2011.
- "Pentagon watchdog to release classified audit on V-22 Osprey". Marine Corps Times. Retrieved 6 April 2015.
- Capaccio, Tony (25 October 2013). "Pentagon's Inspector General Finds V-22 Readiness Rates Flawed". www.businessweek.com. Bloomberg News. Retrieved 25 October 2013.
- Lamothe, Dan (2 November 2013). "Are the Marines faking the reliability record of their $79 million superplane?". stripes.com. Foreign Policy. Retrieved 2 November 2013.
- Shalal-Esa, Andrea. "U.S. eyes V-22 aircraft sales to Israel, Canada, UAE." Reuters, 26 February 2012. Retrieved: 27 February 2012.
- Reed, John. "Boeing to make new multiyear Osprey offer." Navy Times, 5 May 2010.
- Hoffman, Michael. "Osprey Readiness Rates Improved 25% over 5 years" DODbuzz , April 9, 2014. Accessed: April 9, 2014.
- Whittle, Richard. "Osprey Shows Its Mettle" page 23-26. American Helicopter Society / VERTIFLITE May/June 2015, Vol. 61, No. 3.
- Whittle, Richard. USMC CH-53E Costs Rise With Op Tempo Rotor & Wing, Aviation Today, January 2007. Accessed: 15 March 2012. Quote: For every hour the Corps flies a -53E, it spends 44 maintenance hours fixing it. Every hour a Super Stallion flies it costs about $20,000.
- Magnuson, Stew. "Future of Tilt-Rotor Aircraft Uncertain Despite V-22’s Successes" National Defense Industrial Association, July 2015. Archive
- McKinney, Mike. "Flying the V-22" Vertical (magazine), 28 March 2012. Retrieved: 29 April 2014. Archived on 30 April 2014.
- Norton 2004, pp. 98–99.
- Schinasi 2008, p. 16.
- Schinasi 2008, p. 11.
- Gross, Kevin, Lt. Col. U.S. Marine Corps and Tom Macdonald, MV-22 test pilot and Ray Dagenhart, MV-22 lead government engineer. "Dispelling the Myth of the MV-22." Proceedings: The Naval Institute, September 2004. Retrieved: 9 April 2009.
- "Osprey OK'd." Defense Tech, 28 September 2005.
- "FY 2009 Budget Estimates" (PDF), p. 133. United States Air Force, February 2008.
- Christie, Rebecca. "DJ US Navy Expects Foreign Interest In V-22 To Ramp Up Next Year." Naval Air Systems Command, United States Navy via Dow Jones Newswires, 31 May 2007.
- John T. Bennett (14 January 2014). "War Funding Climbs in Omnibus Bill for First Time Since 2010". defensenews.com. Retrieved 31 March 2014.
- Keller, John. "Bell-Boeing to design new integrated avionics processor for V-22 Osprey tiltrotor aircraft." Militaryaerospace.com, 18 April 2010.
- "Raytheon wins $250 million contract for V-22 aircraft avionics from US." defenseworld.net. Retrieved: 30 December 2010.
- "DOD Contracts." Defense.gov, 24 November 2009. Retrieved: 23 June 2010.
- McHale, John. "Block C V-22 Osprey with new radar, cockpit displays, and electronic warfare features delivered to Marines". Military Embedded Systems, 15 February 2012. Retrieved: 24 February 2012.
- "LTG Davis Talks To Boeing On Upgrading Half Of Marine V-22 Fleet". Breaking Defense. Retrieved 31 October 2015.
- Bell-Boeing award V-22 multi-year contract – Flightglobal.com, 12 June 2013
- US military orders additional V-22 Ospreys – Shephardmedia.com, 13 June 2013
- Pentagon Signs Multiyear V-22 Deal – Aviationweek.com, 13 June 2013
- V-22 Sees Up To 100 Foreign Sales; Drives Flight Costs Down, Boosts Readiness – Breakingdefense.com, 17 June 2013
- Osprey Team Eyes Aerial Refueling, Comms Options – Aviationweek.com, 9 September 2013
- Berard, Yamil (5 May 2014). "Bell to lay off 325 workers as V-22 orders decline". www.star-telegram.com. The McClatchy Company. Retrieved 17 May 2014.
- Huber, Mark (25 February 2015). "New Programs at Full Speed". Aviation International News. Retrieved 12 March 2015.
- Laird, Robbin. "A Hybrid Manufacturer For A Hybrid Airplane" Manufacturing & Technology News, 27 August 2015 Volume 22, No. 10. Archive
- Laird, Robbin. "A PERSPECTIVE FROM VISITING THE BOEING PLANT NEAR PHILADELPHIA" SLD, 28 May 2015 . Archive
- Air Force special ops looks to add armor, firepower to Ospreys – Airforcetimes.com, 17 September 2014
- Whittle, Richard. "AFSOC Ospreys Armor Up After Painful Lessons Learned In South Sudan" Breaking Defense 15 May 2015. Archive
- Croft, John. "Tilters." Alternate link Air & Space/Smithsonian, 1 September 2007. Archived on 6 May 2015.
- Osprey Pilots Receive First FAA Powered Lift Ratings (1999 Archive from Boeing)
- "V-22 Osprey Guidebook, 2013/2014." Bell-Boeing, 2013. Retrieved: 6 February 2014. Archived in 2014.
- Chavanne, Bettina H. "USMC V-22 Osprey Finds Groove In Afghanistan." Aviation Week, 12 January 2010. Retrieved: 23 June 2010.
- Whittle, Richard. "Flying The Osprey Is Not Dangerous, Just Different: Veteran Pilots" defense.aol.com, 5 September 2012. Retrieved: 16 September 2012. Archived on 3 October 2013.
- "V-22 Osprey range and ceiling". AirForceWorld.com , 6 October 2015.
- Currie, Major Tom P., Jr., USAF. "A Research Report Submitted to the Faculty, In Partial Fulfillment of the Graduation Requirements: The CV-22 'Osprey' and the Impact on Air Force Combat Search and Rescue" (PDF). Air Command and Staff College, April 1999.
- "Tenacious Efforts to Accomplish Another V-22 Milestone." U.S. Navy, 17 June 2009.
- Lazarus, Aaron. DARPA-BAA 10-10, Thermal Management System (TMS) DARPA, 16 November 2009. Accessed: 18 March 2012. Quote: "MV-22 Osprey has resulted in ship flight deck buckling that has been attributed to the excessive heat impact from engine exhaust plumes. Navy studies have indicated that repeated deck buckling will likely cause deck failure before planned ship life."
- Butler, Amy (5 September 2013). "F-35B DT 2 Update: A few hours on the USS Wasp". Aviation Week & Space Technology. Archived from the original on 3 September 2014. Retrieved 4 April 2015.
- Rolls-Royce Boosts Power for V-22 Engines Defensenews.com, 16 September 2013.
- US military seeking replacement V-22 engines – Flightglobal.com, 29 August 2014
- Wall, Robert, "US mulls engine options for its Osprey aircraft", Wall Street Journal, 2 September 2014, p.B3
- "US Navy developing early plans for V-22 mid-life upgrade" – Flightglobal.com, 15 April 2015
- Whittle, Richard. "Fatal Crash Prompts Marines To Change Osprey Flight Rules". Breaking Defense, 16 July 2015.
- John Gordon IV et al. Assessment of Navy Heavy-Lift Aircraft Options p39. RAND Corporation, 2005. Retrieved: 18 March 2012. ISBN 0-8330-3791-9. Archived in 2011.
- "Hurricanes... Unleashing Nature's Fury: A Preparedness Guide." National Oceanic and Atmospheric Administration|, National Weather Service, September 2006. Retrieved: 26 February 2008.
- Waters, USMC Cpl. Lana D. V-22 Osprey Fast rope 1 USMC, 6 November 2004. Retrieved: 18 March 2012. Archived on 21 March 2005.
- Trimble, Stephen. "Boeing looks ahead to a 'V-23' Osprey." Flight Global, 22 June 2009. Archived on 12 January 2015.
- "V-22 Osprey – Boeing"
- Ringenbach, Daniel P. and Scott Brick. "Hardware-in-the-loop testing for development and integration of the V-22 autopilot system, pp. 28–36" (PDF). Technical Papers (A95-39235 10–01): AIAA Flight Simulation Technologies Conference Technical Papers, Baltimore, MD, 3 August 2008.
- Beaver, Donald B. "Marine Corps Aviation Assault Support for the 21st Century: Is There a Case for the MV-22." Defense Technical Information Center, 8 April 1992.
- Landis, Kenneth H., et al. "Advanced flight control technology achievements at Boeing Helicopters." International Journal of Control, Volume 59, Issue 1, 1994, pp. 263–290.
- "An Afghan Report: The Osprey Returns from Afghanistan, 2012." SLD, 13 September 2012. Archived on 11 January 2015.
- Norton 2004, pp. 6–9, 95–96.
- Markman and Holder 2000, p. 58.
- Norton 2004, p. 97.
- "Defensive Armament for the V-22 Selection, Integration, and Development." Bell Helicopter and General Dynamics. Retrieved: 30 December 2010.
- "BAE Systems Launches New V-22 Defensive Weapon System, Begins On-The-Move Testing." BAE Systems, 2 October 2007.
- McCullough, Amy. "Ospreys, with boost in firepower, enter Afghanistan." Marine Corps Times, 7 December 2009, p. 24. Retrieved: 10 December 2009.
- Whittle, Richard. "BAE Remote Guardians Join Osprey Fleet." Rotor & Wing Magazine, 1 January 2010.
- Lamothe, Dan. "Ospreys leave new belly gun in the dust." Marine Corps Times, 28 June 2010. Retrieved: 28 June 2010.
- "Corps seeks better weaponry on Ospreys". Marinecorpstimes.com, 13 February 2012.
- Corps' aviation plan calls for armed Ospreys – MarineCorpstimes.com, 23 November 2014
- Osprey Fires Guided Rockets And Missiles In New Trials – Aviationweek.com, 8 December 2014
- V-22 demonstrates forward-firing missile capability – Flightglobal.com, 23 December 2014
- Boeing developing Osprey aerial refueling kit Flightglobal.com, 10 April 2013
- "Bell Boeing V-22 Osprey Deploys Refueling Equipment in Flight Test". Boeing.com. Boeing. 5 September 2013. Retrieved 4 April 2015.
- "New Pics: MV-22, Hornet in Refueling Tests". Aviationweek.com, 3 September 2013.
- V-22 to get a tanker option – Militarytimes.com, 28 December 2014.
- Navy Not Following Marines’ Lead in Developing V-22 Osprey Tanker – News.USNI.org, 4 May 2015
- Kreisher, Otto. "After decades of tragedy, Osprey may be ready for combat." San Diego Tribune, 15 July 2000.
- "Marine Medium Tiltrotor Squadron 266 History." U.S. Marine Corps. Retrieved: 16 October 2011.
- Carter, Chelsea J. "Miramar Base to Get Osprey Squadrons." USA Today (Associated Press), 18 March 2008.
- Venerable 'Sea Knight' Makes Goodbye Flights – Military.com, 3 October 2014
- CH-46 Phrog’s Phinal Pharewell Approaches – Defensemedianetwork.com, 3 October 2014.
- Mount, Mike. "Marines to deploy tilt-rotor aircraft to Iraq." CNN.com, 14 April 2007. Retrieved: 19 April 2007.
- "Controversial Osprey aircraft heading to Iraq; Marines bullish on hybrid helicopter-plane despite past accidents." MSNBC, 13 April 2007. Retrieved: 3 August 2008.
- Whittle, Richard. "Military/Utility: Osprey Heads to Iraq." Rotor & Wing, 1 October 2007.
- Mount, Mike. "Maligned aircraft finds redemption in Iraq, military says." CNN.com, 8 February 2008.
- Hambling, David. "Osprey's 'Excellent Photo Op'." Wired (CondéNet, Inc.), 31 July 2008. Retrieved: 6 August 2008.
- Warwick, Graham. "US Marine Corps says V-22 Osprey performing well in Iraq." Flightglobal, 7 February 2008. Retrieved: 10 February 2008.
- Hoyle, Craig. "USMC eyes Afghan challenge for V-22 Osprey." Flight International, 22 July 2008. Retrieved: 25 November 2008.
- "Department of Defense Bloggers Roundtable with Lieutenant General George Trautman, Deputy Commandant of the Marines for Aviation via teleconference from Iraq." U.S. Department of Defense, 6 May 2009. Retrieved: 4 September 2011.
- Gertler, Jeremiah. (quoting USMC Karsten Heckl) "V-22 Osprey Tilt-Rotor Aircraft: Background and Issues for Congress", p. 30. Congressional Research Service reports, 22 December 2009. Accessed: 15 March 2012.
- "GAO-09-482: Defense Acquisitions, Assessments Needed to Address V-22 Aircraft Operational and Cost Concerns to Define Future Investments" (summary). gao.gov. Retrieved: 30 December 2010.
- "GAO-09-482: Defense Acquisitions, Assessments Needed to Address V-22 Aircraft Operational and Cost Concerns to Define Future Investments" (full report)." U.S. Government Accountability Office, 11 May 2009.
- McLeary, Paul. "Trial By Fire." Aviation Week, March 15, 2010. Retrieved: 28 June 2010.
- Schanz, Marc V. "V-22s Got Dirty in Anbar." Air Force magazine, Daily Report, 25 February 2009.
- "MV-22 Logs 100,000 Flight Hours." defensetech.org, February 2011. Retrieved: 18 February 2011.
- Talton, Trista. "24th MEU joining Haiti relief effort." Marine Corps Times, 20 January 2010. Retrieved: 21 January 2010.
- Mulrine, Anna. "How an MV-22 Osprey rescued a downed US pilot in Libya." Christian Science Monitor, 22 March 2011.
- Lamothe, Dan. "Reports: Marines rescue downed pilot in Libya." U.S. Navy Times, 22 March 2011.
- Ki Mae Heussner) (2 May 2011). "USS Carl Vinson: Osama Bin Laden's Burial at Sea". Technology. ABC News. Retrieved 2012-05-02.; Jim Garamone (2 May 2011). "Bin Laden Buried at Sea". NNS110502-22. American Forces Press Service. Retrieved 2011-05-02.; and Richard Whittle (April 6, 2012). "Marines Push Quietly, But Hard, For Navy to Replace C-2s With V-22s". Defense. AOL. Retrieved 2012-10-09..
- Revelos, Andrew. "HMX-1’s ‘Super Stallions’ reassigned to operating forces." USMC, 15 April 2011.
- Munoz, Carlo. "Osprey to take on White House transport mission in 2013." The Hill, 24 May 2012.
- "Osprey aircraft deployed for first time in support of Marine One". CNN.com. Retrieved 12 August 2013.
- Reed, John. "Boeing to make new multiyear Osprey offer." Marine Corps Times, 5 May 2010. Retrieved: 6 May 2010.
- Spitzer, Kirk. "No Love For The Marines’ V-22 In Japan". TIME Battleland, 14 June 2012. Retrieved: 17 June 2012.
- "US military Osprey aircraft arrive in Japan amid protests". BBC, 23 July 2012.
- "US Marines land Osprey aircraft on Japanese ship". Newsdaily.com, 15 June 2013.
- USMC V22 Osprey conducted deck trials onboard French Navy's Mistral Class LHD Dixmude – Navyrecognition.com, 11 February 2014.
- USMC Osprey lands on Korean amphibious ship – Shephardmedia.com, 31 March 2015
- Two MV-22B Osprey tiltrotor aircraft completed longest distance flight in the Pacific region – Airrecognition.com, 8 August 2013
- "Marines, Army form quick-strike forces for Africa". www.app.com. USA Today. 15 June 2013. Retrieved 23 June 2013.
- "Marines want new technology for post-Benghazi crisis-response missions" Accessed: April 9, 2014.
- Hoyle, Craig.  Flight International, November 20, 2013. Accessed: November 24, 2013.
- Assistant commandant: MV-22 key to Marines' Philippines mission – Militarytimes.com, 13 November 2013
- Casevac, the new Osprey mission in Afghanistan – MarineCorpstimes.com, 17 May 2014
- SP-MAGTF Commander Details ISIL Strikes; Notes 1st Marines ‘Could Clear’ Iraq – Breakingdefense.com, 20 May 2015
- "CV-22 delivered to Air Force." Air Force Special Operations Command News Service via Air Force Link (United States Air Force), 21 March 2006. Retrieved: 3 August 2008.
- "CV-22 arrival." Hulbert Field, United States Air Force, 20 April 2006. Retrieved: 20 November 2006.
- "Osprey sees first action in search and rescue." Airforce Times, 26 October 2007.
- Sirak, Michael. "Osprey Ready for Combat." Air Force Magazine, Volume 92, Issue 5, May 2009, pp. 11–12. Retrieved: 10 May 2009.
- Lazane, 2nd Lt. Mark. "Osprey delivers for Honduran villagers." U.S. Air Force Special Operations Command, 11 June 2009. Retrieved: 13 March 2011.
- Moore, Mona. "CV-22s return from first deployment with 8th SOS Homecoming." nwfdailynews.com, 12 November 2009.
- "AFSOC Crash Report Faults Understanding Of Osprey Rotor Wake." AOL Defense, 30 August 2012.
- Gordon, Michael R. "Attack on U.S. Aircraft Foils Evacuation in South Sudan" New York Times, December 21, 2013. Accessed: December 22, 2013.
- "Four U.S. soldiers injured in South Sudan after their aircraft CV-22 Osprey came under fire". Armyrecognition.com, 22 December 2013.
- "CV-22 crews save lives". Globalavaiationreport.com, 4 August 2014.
- Entous, Adam, Julian Barnes and Siobhan Gorman, "Intelligence gaps crippled mission to rescue hostages", Wall Street Journal, September 6–7, 2014, p. A1.
- Air Force looking at using Ospreys for search and rescue – Militarytimes.com, 22 April 2015
- Norton 2004, pp. 26–28, 48, 83–84.
- Norton 2004, pp. 28–30, 35, 48.
- Tilghman, Andrew. "Tilt-rotor helicopter still looking for mission." Navy Times, 20 September 2009.
- Thompson, Loren B. "'V' For Versatility: Osprey Reaches For New Missions." Lexington Institute, 29 March 2010.
- Mass Communication Specialist 3rd Class Renee Candelario, USN (8 October 2012). "MV-22 Osprey Flight Operations Tested Aboard USS Nimitz". NNS121008-13. USS Nimitz Public Affairs. Retrieved 2011-10-09.
- Butler, Amy (18 April 2013). "Osprey on the Truman, Fishing for COD". Aviation Week. The McGraw-Hill Companies. Retrieved 18 April 2013. Video
- The Future COD Aircraft Contenders: The Bell Boeing V-22 – Defensemedianetwork.com, 2 August 2013
- Israel could double V-22 order size, Bell says – Flightglobal.com, 25 February 2014
- Navy 2016 Budget Funds V-22 COD Buy, Carrier Refuel – Breakingdefense.com, 2 February 2015
- Whittle, Richard. "Navy Decides to Buy V-22 Ospreys for Carrier Delivery" Breaking Defense, 13 January 2015.
- Navy and Marines Sign MOU for Bell-Boeing Osprey to be Next Carrier Delivery Aircraft – News.USNI.org, 13 January 2015
- NAVAIR Details Changes in Navy V-22 Osprey Variant – News.USNI.org, 2 April 2015
- India; ARC mulls OV-22 Osprey buy – Dmilt.com, 11 May 2015
- "India Outlines New Carrier Ambitions". Aviation International News. Retrieved 31 October 2015.
- Alon, Ben-David. "Israel considers V-22 acquisition" (subscription article). Jane's Defence Weekly (Jane's Information Group ), 25 January 2006.
- "Israel confirms interest in Bell Boeing V-22 tiltrotor." Flight International, 25 October 2007.
- Egozi, Arie. "Israel drops interest in V-22, eyes CH-53K evaluation." Flight International, 12 November 2009.
- Egozi, Arie. "IAF ups pressure for V-22 buy." Flight Global, 2 August 2011. Retrieved: 4 September 2011.
- "Israeli pilots give detailed assessment of V-22 tiltrotor." Flight,
- "Hagel, Yaalon Finalize New Israel Military Capabilities". U.S. DoD, 22 April 2013.
- WEISGERBER, MARCUS (31 October 2013). "Hagel: US To Fast-Track V-22 Sale to Israel". defensenews.com. Gannett Government Media Corporation. Retrieved 31 October 2013.
- Israel Could Receive V-22 Ospreys by 2015 Tamir Eshel, November 1, 2013, Defense Update
- Egozi, Arie (15 January 2014). "Israel requests six-aircraft V-22 purchase". www.flightglobal.com. Flight International. Retrieved 15 January 2014.
- Eshel, Tamir (January 15, 2014). "Pentagon Details Israel's MV-22 Osprey Package". defense-update.com. Defense Update. Retrieved 15 March 2014.
- "Purchase of the V-22 Boeing helicopter-plane is off for the moment". Globes, 28 October 2014.
- "Israel cancels plan to purchase US V-22 Ospreys". Press TV, 31 October 2014.
- Ya'alon Dropping V-22 Osprey Purchase From America. israelnationalnews.com, 30 October 2014.
- Reed Business Information Limited. "Budget pressures threaten Israeli V-22 deal". flightglobal.com. Retrieved 6 April 2015.
- "Heli Expo 2015 Preview", page 124. Helicopter International, Volume 38 Number 4 January – February 2015. ISSN 0143-1005. Archive
- Israeli $800M V-22 Deal Not Dead: Just Hovering – Breakingdefense.com, 11 December 2014
- "Defense Ministry studies Osprey use by Self-Defense Forces". AJW by The Asahi Shimbun. Retrieved 6 April 2015.
- Japan Seeks V-22 Ospreys For Naval Ops – Armedforces-Int.com, 20 August 2013
- Japan Officially Selects Osprey, Global Hawk, E-2D – Defensenews.com, 21 November 2014
- A lot of new equipment purchases in latest 5-year defense plan – Asahi.com, 14 December 2013
- "Japan defence budget calls for 20 P-1s, 5 V-22s". flightglobal.com. Retrieved 12 January 2015.
- Seoul Reportedly Plans to Buy US' Osprey V-22 Aircraft – Sputniknews.com, 23 February 2015
- "UAE V-22 Deal Nears Closure". Aviation Week, 3 May 2012.
- "United Arab Emirates Steps Up Arms Deals With US". Al-Monitor.com, 14 May 2012.
- Mustafa, Awad; Mehta, Aaron (10 November 2015). "UAE Picks AW609 for Tiltrotor Requirement". defensenews.com. TEGNA. Retrieved 10 November 2015.
- Awad Mustafa (13 November 2015). "UAE Armed Forces: No Negotiations on V-22 Tiltrotor". Defense News.
- Norton 2004, p. 54.
- "CV-22 Osprey Fact Sheet." United States Air Force, 7 July 2006. Retrieved: 21 August 2013.
- Norton 2004, pp. 71–72.
- "Bell-Boeing V-22 Guidebook – Bell Helicopter"
- Norton 2004, pp. 100–01.
- Norton 2004, p. 77.
- "US Marine Corps retires CH-53D". Rotorhub, 24 February 2012.
- Richard Beedall (October 9, 2012). "Maritime Airborne Surveillance and Control (MASC)". NNS121008-13. Naval Matters. Retrieved 2011-10-09.
- "V-22 Osprey Guidebook." Naval Air Systems Command, United States Navy, 2011/2012, p. 5.
- "Japan becomes first V-22 export customer". flightglobal.com. Retrieved 14 July 2015.
- World Air Forces 2014, Flightglobal, January 2014.
- "352ND SPECIAL OPERATIONS GROUP". afsoc.af.mil. Retrieved 7 January 2014.
- "Fact Sheet: 8 Special Operations Squadron". U.S. Air Force, 8 August 2008.
- "CV-22 commencement of operations ceremony held". U.S. Air Force, 21 June 2010.
- "Fact Sheet: 71 Special Operations Squadron". U.S. Air Force, 3 January 2012.
- "418th FLTS tests CV-22 terrain-following radar in East Coast fog". af.mil. Retrieved 6 April 2015.
- "Presidential MV-22 Osprey Photo". aviationweek.com. Retrieved 31 October 2015.
- "VMX-22 Argonauts". tripod.com. Retrieved 5 November 2013.
- "VMM-161". tripod.com. Retrieved 5 November 2013.
- "VMM-165". tripod.com. Retrieved 5 November 2013.
- "VMM-165". tripod.com. Retrieved 5 November 2013.
- "VMM-166". tripod.com. Retrieved 5 November 2013.
- "VMMT-204". tripod.com. Retrieved 5 November 2013.
- "VMM-261". tripod.com. Retrieved 5 November 2013.
- "VMM-263". usmc.mil. Retrieved 5 November 2013.
- "VMM-264". tripod.com. Retrieved 5 November 2013.
- "VMM-266". tripod.com. Retrieved 5 November 2013.
- "VMM-363". helis.com. Retrieved 5 November 2013.
- "VMM-365". tripod.com. Retrieved 5 November 2013.
- "VMM-561". tripod.com. Retrieved 5 November 2013.
- Axe, David. "General: ‘My Career Was Done’ When I Criticized Flawed Warplane". Wired, 4 October 2012.
- "Aircraft on display." American Helicopter Museum & Education Center, 2008. Retrieved: 24 April 2012.
- "NMUSAF CV-22". YouTube. Retrieved 6 March 2015.
- Norton 2004, pp. 110–111.
- "V-22 Osprey: Technical Specifications." Boeing Defense, Space and Security. Retrieved: 14 November 2015.
- "V-22 Characteristics." Naval Air Systems Command. Retrieved: 25 November 2008.
- Pincus, Walter. "Marines' New Ride Rolls Out Years Late." Washington Post, 3 February 2009.
- White, Andrew. "USAF seeks special operations CSAR vehicle." Shephard Group, 24 June 2010.
- Wall, Robert. "U.S. Marines See MV-22 Improvements." Aviation Week, 24 June 2010.
- Norton 2004, p. 111.
- "Remote Guardian System (RGS) (United States), Guns – Integral and mounted." Jane's Information Group, 28 April 2010.
- Markman, Steve and Bill Holder. "Bell/Boeing V-22 Osprey Tilt-Engine VTOL Transport (U.S.A.)". Straight Up: A History of Vertical Flight. Atglen, Pennsylvania: Schiffer Publishing, 2000. ISBN 0-7643-1204-9.
- Norton, Bill. Bell Boeing V-22 Osprey, Tiltrotor Tactical Transport. Earl Shilton, Leicester, UK: Midland Publishing, 2004. ISBN 1-85780-165-2.
- O'Hanlon, Michael E. Defense Policy Choices for the Bush Administration. Washington, D.C.: Brookings Institution Press, 2002. ISBN 0-8157-6437-5.
- Schinasi, Katherine V. Defense Acquisitions: Readiness of the Marine Corps' V-22 Aircraft for Full-Rate Production. Darby, Pennsylvania: Diane Publishing, 2008. ISBN 1-4289-4682-9.
- Whittle, Richard. The Dream Machine: The Untold History of the Notorious V-22 Osprey. New York: Simon & Schuster, 2010. ISBN 1-4165-6295-8.
|Wikimedia Commons has media related to V-22 Osprey.|
- Official Boeing V-22 site
- Official Bell V-22 site
- V-22 Osprey web
- V-22 Osprey history on Navy.mil
- CV-22 fact sheet on USAF site
- V-22 page on GlobalSecurity.org
- "The V-22 Osprey", Documentary on the V-22 In Iraq
- "Flight of the Osprey", U.S. Navy video of V-22 operations
- Cutaway drawing of V-22 prototype
- Newer cutaway drawing of V-22