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The Allison XV-1710-1 (V-1710-A2) was the first V-1710 engine built for the Army Air Corps, following the success of the Navy’s GV-1710-A model. The Air Corps ordered an engineering prototype in March 1932, and after initial testing by Allison, it was delivered for experimental tests to the Air Corps at Wright Field in July 1933, with the first production engine delivered in February 1935. In that same period, Allison became a division of General Motors. The V-1710 was the only U.S. liquid-cooled production engine of World War II. Ultimately, more than 47,000 V-1710s were built in 57 different versions. During World War II, V-1710s powered various models of the Lockheed P-38, Curtiss P-40, Bell P-39 and P-63, and North American P-51 fighter aircraft. Constant development, including use of a turbocharger, increased the rated take-off power to as high as 1,715 kW (2,300 hp) following World War II.