Background
The P-43 Lancer was developed in 1938 by Seversky Aircraft Corp. as a successor to their P-35. The new model was larger overall and featured the Pratt and Whitney R-1830 Twin Wasp radial engine with an exhaust driven supercharger. While the airplane possessed good altitude performance, it was apparent that it would not be able to compete with the aircraft then in operation in Europe. Small numbers were produced for the Army Air Corps and some others for export to the Chinese Air Force and the RAAF. In service, the airplane suffered from leakage from the integral wing fuel tanks and combined with the lower fuselage supercharger this caused a number of fires. The airplane was replaced by the larger, more powerful P-47 Thunderbolt.