Curtiss Model 75A

Last revised June 12, 1999

Model 75A was the company designation for a Curtiss-owned demonstrator which carried a civilian registration of NX22028. This demonstrator aircraft was used to carry out several company-originated experiments. First, it was fitted with an external mechanical supercharger mounted underneath its Pratt & Whitney R-1830 engine and briefly designated Model 75J. Then, it was experimentally fitted with a turbosupercharged R-1830-SC2-G engine. The supercharger was fitted underneath the nose just aft of the engine cowling, and the intercooler was mounted underneath the trailing edge of the wing. The company designation for this modification was Model 75R. Empty and normal loaded weights went up to 5074 lbs and 6163 lbs. During trials in January 1939, it attained a maximum speed of 330 mph at 15,000 feet. However, the poor reliability and complexity of the turbosupercharger led the USAAC to decide not to proceed with a supercharged variant of the P-36, choosing instead to purchase the turbo-supercharged Seversky (Republic) XP-41, which had been converted from the last P-35. After trials at Wright Field, the aircraft was returned to the Curtiss plant in Buffalo, where it was fitted with a Wright R-1820 engine and resumed its role as a demonstrator. Sources:

  1. Curtiss Aircraft, 1907-1947, Peter M Bowers, Naval Institute Press, 1979

  2. The Curtiss Hawk 75, Aircraft in Profile No. 80, Profile Publications, Ltd. 1966

  3. War Planes of the Second World War, Fighters, Volume Four, William Green, Doubleday, 1961.

  4. Air Enthusiast, Volume 1, William Green et al, Doubleday, 1971.