<p>Wright R-1300</p><p>R-1300</p><p>R-1300-3 installed in a Sikorsky UH-19</p><p>Type Radial engine</p><p>National origin United States</p><p>Manufacturer Wright Aeronautical</p><p>First run 1942</p><p>Major applications T-28 Trojan</p><p>Developed from Wright R-2600</p><p>The Wright R-1300 Cyclone 7 is an American aircooled seven-cylinder supercharged radial aircraft engine produced by Curtiss-Wright.[1] </p><p>The R-1300 is similar to a single row Wright R-2600. The engine was mass produced but not widely used. Engineering began in 1942 but the first flight of an R-1300 did not take place until 1949. The engine was produced under license by Kaiser-Frazer and, later by Lycoming.</p><p>The engine was used in combat, installed in the North American T-28 Trojan and the Sikorsky UH-19 Chickasaw. It was used in the Ayres Thrush.</p><p>For use in helicopters the R-1300-3 was derated to 690.3 hp (515 kW) and uses forced-air cooling.</p><p>General characteristics</p><p> Type: 7-cylinder supercharged air-cooled single row radial engine  Bore: 6.125 in (155.6 mm)  Stroke: 6.312 in (160.2 mm)  Displacement: 1,301 in (21.3 L)  Length: 48.22 in (1,225 mm)  Diameter: 55 in (1,397 mm)  Dry weight: 1055 lb (478 kg)</p><p>Components</p><p> Valvetrain: Two pushrod-actuated valves per cylinder with sodium-cooled exhaust valve  Supercharger: 1-stage  Fuel system: Bendix-Stromberg PD9F1 downdraft carburetor with automatic mixture control  Cooling system: Air-cooled</p><p>Performance</p><p> Power output: 800 hp (596 kW)  Specific power: 0.61 hp/in³ (27.94 kW/L)  Compression ratio: 6.20:1  Power-to-weight ratio: 0.76hp/lb (1.25 kW/kg)</p>