|Manufacturer||Douglas Aircraft Company|
|Primary user||United States Army Air Corps|
|Developed from||Douglas XP3D|
Design and development
In November 1932, the U.S. Army ordered the development of an amphibious reconnaissance aircraft/bomber, intended to act as navigation leaders and rescue aircraft for formations of conventional bombers. The resultant aircraft, which was ordered under the bomber designation YB-11, was designed in parallel with the similar but larger Douglas XP3D patrol flying boat for the United States Navy. It was a high-winged monoplane with two Wright R-1820 Cyclone radial engines mounted in individual nacelles above the wing, resembling an enlarged version of the Douglas Dolphin.
Prior to completion, it was redesignated firstly as an observation aircraft YO-44 and then as the YOA-5 'observation amphibian model 5'. It first flew during January 1935, and was delivered to the army during February that year. The concept for which it was designed proved impracticable, and no further production ensued, but the YOA-5 was used to set two world distance records for amphibians, being finally scrapped in December 1943.
- An amphibious reconnaissance bomber ordered in 1932 by the US Army Air Corps.
- The YB-11 redesignated in the Observation category before completion.
- Another redesignation to the Observation Amphibian category. One built, given the aforementioned designations at various times in its life.
- Length: 69 ft 9 in (21.3 m)
- Wingspan: 89 ft 9 in (27.4 m)
- Height: 22 ft 0 in (6.7 m)
- Wing area: 1,101 ft² (102.3 m²)
- Empty weight: 14,038 lb (6,368 kg)
- Loaded weight: 20,000 lb (9,000 kg)
- Powerplant: 2 × Wright R-1820-45 Cyclone air-cooled radial piston engines, 800 hp (600 kW) each
- Maximum speed: 169 mph (147 knots, 272 km/h)
- Cruise speed: 152 mph (132 knots, 245 km/h)
- Stall speed: 75 mph (65 knots, 120 km/h)
- Range: mi (nm, km)
- Service ceiling: 18,900 ft (5,760 m)
- Rate of climb: 770 ft/min (3.9 m/s)
- Wing loading: 18 lb/ft² (89 kg/m²)
- Power/mass: 0.080 hp/lb (130 W/kg)
- Guns: 3× .30 in (7.62 mm) machine guns
- Related lists
- List of bomber aircraft
- List of military aircraft of the United States
- List of seaplanes and flying boats
- Francillon 1979, p.192.
- Francillon 1979, pp. 192—193.
- Francillon, René. McDonnell Douglas Aircraft since 1920. London:Putnam, 1979. ISBN 0-370-00050-1.
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