The Martin P7M was an unbuilt

aircraft An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engine ...

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

(USN) for an

anti-submarine warfare Anti-submarine warfare (ASW, or in older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are t ...

flying boat.

Design and development

The design was for a flying boat that would make use of

boundary layer control Boundary layer control refers to methods of controlling the behaviour of fluid flow boundary layers. It may be desirable to reduce flow separation on fast vehicles to reduce the size of the wake (streamlining), which may reduce drag. Boundary l ...

(BLC) 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 Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances (ranging), communicate with or detect objects on or ...

. Martin proposed a variant of the P5M Marlin, the P5M-3, to take advantage of this phenomenon. Martin continued development of the P5M-3 under the designation P7M Submaster, introducing two

General Electric J85 The General Electric J85 is a small single-shaft turbojet engine. Military versions produce up to of thrust dry; afterburning variants can reach up to . The engine, depending upon additional equipment and specific model, weighs from . It is on ...

BLC gas generators, one in the rear of each outer engine nacelle. A mock-up was built, but the P7M,

Convair XP6Y The Convair P6Y was an unbuilt aircraft designed by Convair in the 1950s. The design was initiated to meet a requirement of the United States Navy (USN) for an anti-submarine warfare seaplane. History The design was for a flying boat that wou ...

and

Grumman G-132 The Grumman G-132 was an unbuilt aircraft designed by Grumman in the 1950s. The design was initiated to meet a requirement of the United States Navy (USN) for an anti-submarine warfare seaplane. Design and development The design was for a flying ...

were all cancelled when the US Navy abandoned their open-ocean seaplane requirement.

Specifications (P7M projected)

References

{{USN patrol aircraft P7M Aircraft with auxiliary jet engines Cancelled military aircraft projects of the United States Flying boats Parasol-wing aircraft