XP-47F was the designation given to another P-47B airframe (serial
number 41-5938) which was used to test a new larger-area wing with a
laminar-flow aerofoil. It flew for the first time on September 17,
1942. No production was undertaken.
Sources:
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American Combat Planes, Ray Wagner, Third Enlarged Edition, Doubleday,
1982.
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The American Fighter, Enzo Angelucci and Peter Bowers, Orion Books,
1987.
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War Planes of the Second World War, Fighters, Volume Four, William
Green, Doubleday 1964.
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United States Military Aircraft since 1909, Gordon Swanborough and
Peter M. Bowers, Smithsonian, 1989.
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The Republic P-47D Thunderbolt, Aircraft in Profile, Edward Shacklady,
Doubleday, 1969.
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Famous Fighters of the Second World War, Volume I, William Green,
1967.
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Thunderbolt!, Robert S. Johnson and Martin Caidin, Ballantine Books,
1958.
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Thunderbolt: A Documentary History of the Republic P-47, Roger
Freeman, Motorbooks, 1992.