Wright R-2600 Cyclone 14 The R-2600 series engine was introduced in 1939, initially rated at 1,500 hp. With improvements, it later reached a rating of 1,800 hp. In military use, it was used on Army Air Forces A-20s and B-25s as well as some Navy torpedo and patrol bombers. It also gained fame powering the well-known Boeing Model 314 Clipper, which offered transoceanic passenger service beginning in 1939. After the end of World War II, the R-2600 was superseded by larger radial engines. TECHNICAL NOTES: Type: 14-cylinder, two-row, air-cooled radial Displacement: 2,604 cu.in. Maximum rpm: 2,600 Maximum hp: 1,700 Weight: 1,980 lbs. Cost: $16,500 Click here to return to the World War II Gallery.