(U.S. National Archives and Records Admin. Photograph.) black-and-white photos Pratt & Whitney R-2800 Double Wasp April 12, 2016by Lone_Sentry_Admin1 min read Factory workers assemble the cylinders on an early production Pratt & Whitney R-2800 Double Wasp radial aircraft engine in June 1942. (U.S. National Archives and Records Admin. Photograph.) (U.S. National Archives and Records Admin. Photograph.)