Martin P7M SubMaster

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Role ASW flying boat
Manufacturer Martin
Primary user U.S. Navy
Number built 0

The Martin P7M was an unbuilt aircraft designed by Martin in the 1950s. The design was initiated to meet a requirement of the United States Navy (USN) for an anti-submarine warfare seaplane.


The design was for a flying boat that would make use of boundary layer control to achieve slow speed flight. It was intended that this would enable the aircraft to land on the open ocean in rough seas and deploy a dipping sonar. Martin proposed a variant of the P5M Marlin, the P5M-3, to take advantage of this phenomenon, and the P5M-3 was deemed sufficiently distinct from the P5M-2 to be allocated the new designation P7M. The Martin P7M Submaster lost out to the Convair XP6Y along with the Grumman G-132.[1]

Specifications (projected)

General characteristics

  • Length: 136 ft (41 m)
  • Wingspan: 111 ft 7 in (34.01 m)
  • Height: 39 ft (12 m)
  • Wing area: 2,500 sq ft (230 m2)
  • Powerplant: 4 × Wright R-1820-42 radial piston engines
  • Powerplant: 1 × General Electric YJ85-GE-1 turbojets, 2,100 lbf (9.3 kN) thrust in rear of centre nacelle


  • Maximum speed: 403 mph; 648 km/h (350 kn)
  • Range: 1,381 mi; 2,222 km (1,200 nmi)
  • Service ceiling: 25,300 ft (7,711 m) service ceiling


Missiles, bombs, and depth charges on external hardpoints

See also

Aircraft of comparable role, configuration and era
Related lists


  1. Johnson, E.R. (2009). American Flying Boats and Amphibious Aircraft: An Illustrated History. Jefferson, North Carolina: McFarland & Company, Inc., Publishers. pp. 343-345. ISBN 978-0-7864-3974-4.