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Lawrance L-4S

DAYTON, Ohio -- Lawrance L-4S engine on display in the Early Years Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Lawrance L-4S engine on display in the Early Years Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo)

Lawrance L-4S 60-hp air-cooled engine of the early 1920s was flight-tested in "Pony Blimp" airships as well as the Sperry "Messenger" airplane. It is typical of early-type radial engines that were developed following the demise of the rotary engine used during World War I.

Click here to return to the Early Years Gallery.

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