Last revised June 5, 1999
The designation P-40J was given to a projected version of the P-40E which was to have a turbosupercharged engine.
This study was abandoned in May 1942 without anything ever being built.
War Planes of the Second World War, Fighters, Volume Four, William Green,
The American Fighter, Enzo Anguluci and Peter Bowers, Orion Books, 1987.
United States Military Aircraft since 1909, Gordon Swanborough and Peter
M. Bowers, Smithsonian Institution Press, 1989.
Curtiss Aircraft, 1907-1947, Peter M. Bowers, Naval Institute Press, 1979.
The Curtiss P-40 Tomahawk, Ray Wagner, Aircraft in Profile, Volume 2,