Martin P7M SubMaster
{{Refimprove|date=September 2018}}
| {{Infobox Aircraft Begin
|name = P7M |caption = |image = }}{{Infobox Aircraft Type |type = anti-submarine warfare (ASW) flying boat |manufacturer = Glenn L. Martin Company |designer = |first flight = |introduced = |retired = |status = |primary user = United States Navy |more users = |produced = |number built = 0 (mock-up only) |unit cost = |program cost = |variants with their own articles = |developed from=P5M Marlin }} |
The Martin P7M was an unbuilt aircraft designed by the Glenn L. Martin Company in the 1950s. The design was initiated to meet a requirement of the United States Navy for an anti-submarine warfare flying boat.
Design and development
The design was for a flying boat that would make use of boundary layer control (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. 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 BLC gas generators, one in the rear of each outer engine nacelle. A mock-up was built, but the P7M, Convair XP6Y and Grumman G-132 were all cancelled when the U.S. Navy abandoned its open-ocean seaplane requirement.{{Cite book |last=Johnson |first=E.R. |url=https://archive.org/details/americanflyingbo0000john/page/349 |title=American flying boats and amphibious aircraft : an illustrated history |date=2009 |publisher=McFarland & Co. |isbn=978-0786439744 |location=Jefferson, N.C. |pages=349–353}}
Specifications (P7M projected)
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|length ft=136
|span ft=111
|span in=7
|height ft=39
|wing area sqft=2500
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|eng1 number=4
|eng1 name=Wright R-1820-42
|eng1 type=radial piston engines
|eng1 kw=
|eng1 hp=1525
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|eng2 number=2
|eng2 name=General Electric YJ85-GE-1
|eng2 type=turbojet
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|eng2 note=gas generators for BLC in rear of outer nacelles
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|max speed kts=350
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|range nmi=1200
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|ceiling ft=25,300
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References
{{reflist}}
{{Martin aircraft}}
{{USN patrol aircraft}}
Category:Aircraft with auxiliary jet engines
Category:Cancelled military aircraft projects of the United States
Category:Parasol-wing aircraft
Category:Four-engined tractor aircraft
Category:Four-engined piston aircraft