The Pratt & Whitney R-2800 Double Wasp is an American twin-row, 18-cylinder, air-cooled radial aircraft engine with a displacement of 2,800 cu in (46 L), and is part of the long-lived Wasp family of engines.
Cutaway of a Pratt & Whitney R-2800 Double Wasp
The first prototype F4U Corsair, the earliest aircraft specifically designed to use the Double Wasp
A preserved "B Series" R-2800-21 or -59. The A and B series can be most readily identified by their smooth, single piece nose casings. This photo shows the simplified tubular ignition harness fitted to some R-2800 subtypes.
Northrop P-61 Black Widow
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The Northrop P-61 Black Widow is a twin-engine United States Army Air Forces fighter aircraft of World War II. It was the first operational U.S. warplane designed as a night fighter.
The P-61 radar operator occupied a separate compartment in the rear of the fuselage accessed from a hatch below.
The YP-61 pre-production prototype.
The P-61's upper turret is visible on the fuselage between the wings.