Wright R-1300

The Wright R -1300 Cyclone 7 (internal designation: Curtiss 957 ) was an air-cooled 7- cylinder radial engine with compressor of the U.S. manufacturer Curtiss- Wright.

History

R -1300 is essentially an existing only an asterisk Wright R- 2600. The engine was manufactured in larger series, but found no widespread. The development began in 1942, but the engine could be tested only in 1949 in the air. He was also manufactured under license in Kaiser- Frazer and later Lycoming.

The engine was installed in the North American T -28A Trojan and the Sikorsky UH -19 Chickasaw. In addition, he came in the agricultural aircraft Rockwell Thrush Commander S -2R is used, which was taken over by the company Ayres.

For installation in helicopters to run R -1300 -3 was created, a 515 kW ( 700 hp) had reduced power.

The cylinders were made of steel and nitrided. They were cooled with the aid of attached aluminum ribs. The cylinder heads were made of forged aluminum, from which the fins were milled. The cylinder heads are shrunk onto the cylinder and screwed with them. Each cylinder head bore two valves, the outlet valve was sodium- cooled. The valve train itself consisted of a dual cam drum of the valves on the roller tappet, pushrods and rocker arms are operated. The pistons were made of high-strength forged aluminum and are internally cooled by oil spray. The crank drive consisting of a forged steel, undivided Hauptpleuel were six auxiliary connecting rod articulated to the H- cross section. It plain bearings are used. The crankshaft was made ​​in two parts for the Pleuelmontage and dynamically damped. For the crank forged steel was used. The front part was the reduction gear in it and was like the rear part with the compressor and the power take-offs from a magnesium alloy. The engine was powered by a dry sump lubrication with oil. For the ignition Bosch attended SF7LU -1 magnets.

Technical data (R -1300 -1)

  • Cylinder: 7 air-cooled,
  • Bore: 155.6 mm
  • Stroke: 160.34 mm
  • Displacement: 21.4 l
  • Compression ratio: 6.2:1
  • Translation of the compressor: 7,21:1
  • Reduction of the propeller drive: 0,5625:1
  • Start Power: 588 kW ( 800 hp) at an engine speed of 2600 rpm in 1070m
  • Continuous power: 515 kW ( 700 hp) at an engine speed of 2400 rpm at 1525 m
  • Carburetor: Stromberg P9DE1
  • Diameter: 1281 mm
  • Length: 1255 mm
  • Dry Weight: 461 kg
  • Octane requirement: 91/98 RON
  • Radial engine (aviation )
  • Propeller engine
Curtiss-Wright Wright R-2600 Aluminium Valvetrain Robert Bosch GmbH
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