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Following this he was co-founder of the Spencer-Larsen Aircraft Corporation at Farmingdale, Long Island, New York, where he assisted in the development of a 2-seat pusher amphibian flying boat. Spencer was there until 1940 when he sold his interest in the firm and the name was changed to the Colgate-Larsen Company of Amityville, Long Island, New York. Following this he designed and constructed another light sport amphibian which he intended for the postwar market. 

During World War II he was a test pilot for Republic Aviation Corporation, Farmingdale, new York, on military aircraft, and while there assisted in the design and development of the well-known "Seebee," a 4-place amphibian which gained much public acceptance after the war. 

In 1945 Spencer went west to join Lear, Incorporated, as a staff assistant at Santa Monica, California, where he remained until he retired.

Following his retirement in California, he was active in the design and development or rubber-powered model toy ornithopters which fly successfully and which have been made and marketed by concerns that bought manufacturing rights from him and have sold them through toy stores everywhere. This was followed by a larger gas-powered flying model of the ornithopter. After many successful demonstrations, this ornithopter is now in the National Air and Space Museum collection.

A member of the Early Birds, QB's and National Aeronautic Association, Spencer holds a Commercial Pilot Licence No. 468 and Connecticut License No. 17.

Flying Pioneer Percival H. Spencer devoted his entire lifetime to the engineering, building, developing and flying of aircraft. Self-taught at an early age, he went on to become an outstanding figure in the aviation world and few men have contributed more to the development of aviation progress in the United States. Ingenious, creative, and ever active, his name ranks high in American aviation history.

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