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Lockheed XFV-1 Salmon


From 1949 the US Navy actively pursued a policy of VTOL research. The results were two prototypes, the Lockheed XFV-1 and the Convair XFY-1 Pogo. Both aircraft were of the ‘tail-sitter’ concept and powered by the 5500-shp (4101-kW) Allison T40-A-6 turboprop driving large contra-rotating propeller units. These provided more thrust than the weight of the aircraft, making possible VTOL operation.




The XVF-1 was the more conventionally configured of the two types, with a mid-set wing of low aspect ratio, but for VTOL capability had a cruciform arrangement of tail surfaces indexed at 45 degrees to the wings. Each fitted with a small castoring wheel on the outboard end of its trailing edge. For flight trials with an engine not cleared for VTOL operation the type was fitted with a lightweight but very stalky fixed landing gear arrangement to permit conventional rolling take-off and landing, and in this guise first flew in June 1954. The aeroplane flew 22 times, in the process recording 32 operations in the vertical mode, when variation of the engine power made possible descending, hovering and ascending flight. No pure VTOL operations were undertaken with the only one of the two XFV-ls that flew.



The whole programme was cancelled in June 1955 and construction of the second prototype abandoned.

Span: 9.40m
Maximum take-off weight: 7358kg
Maximum speed: estimated 933km/h.

Lockheed XFV-1 Salmon

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