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"In January 1946, after the Bureau of Aeronautics showed interest in the use of sweptback wings as a result of the data brought back from Germany by the Naval Technical Mission in Europe and of research undertaken by NACA at the Langley Laboratory, Grumman proposed a research aircraft to obtain data on low-speed handling characteristics oh highly swept wings. To reduce costs, consideration was given to fitting swept wings to either a modified Bell P-63 or to a modified Wildcat. In the end, however, Grumman proposed the all-new Design 77. Neither the modified aircraft nor the new design reached the hardware stage. Intended to be powered by a 450-hp Pratt & Whitney R-985 radial, Design 77 was a low-wing aircraft with a wing box structure arranged to accomodate wings with various degrees of sweepback. Fitted with a non-retractable undercarriage, the aircraft was planned as a single-seater but, if desired, could accommodate an observer aft of the pilot."
Source: http://www.angelfire.com/space/grumman/aircraft/designs.html
"In January 1946, after the Bureau of Aeronautics showed interest in the use of sweptback wings as a result of the data brought back from Germany by the Naval Technical Mission in Europe and of research undertaken by NACA at the Langley Laboratory, Grumman proposed a research aircraft to obtain data on low-speed handling characteristics oh highly swept wings. To reduce costs, consideration was given to fitting swept wings to either a modified Bell P-63 or to a modified Wildcat. In the end, however, Grumman proposed the all-new Design 77. Neither the modified aircraft nor the new design reached the hardware stage. Intended to be powered by a 450-hp Pratt & Whitney R-985 radial, Design 77 was a low-wing aircraft with a wing box structure arranged to accomodate wings with various degrees of sweepback. Fitted with a non-retractable undercarriage, the aircraft was planned as a single-seater but, if desired, could accommodate an observer aft of the pilot."
Source: http://www.angelfire.com/space/grumman/aircraft/designs.html