Pratt & Whitney R2800 Radial Engine.....Number of Cylinders: 18 Double Row Air Cooled Radial Displacement: 2,800 ci Bore: 5.8 inches Stroke: 6 inches Compression Ratio: 6.8:1 Aspiraton: Single Stage Supercharger Weight: 2,300lbs Length: inches Diameter: 52 inches Output: 2,000hp at 2,400rpm First Flight: 1939 Airframes used on: F4U Corsair, F-6F Hellcat, P-47 Thunderbolt, DC-8, C-6