The Continental XI-1430 (often identified as the IV-1430 ) was a liquid-cooled aircraft engine developed in the United States by a partnership between the United States Army Air Corps (USAAC) and Continental Motors . It resulted from the USAAC's hyper-engine efforts that started in 1932, but never entered widespread production as it was not better than other available engines when it finally matured. In 1939, the I-1430-3 was designated as the engine to power the Curtiss XP-55 , a radical pusher-engine fighter design that did not reach production. This I-1430-11 engine is in the collection of the National Air and Space Museum at the Smithsonian Institution in Washington, D.C.