Curtiss H-1640

The Curtiss H -1640 Chieftain (also Curtiss R- 1640) from the U.S. manufacturer Curtiss is an air-cooled four-stroke 2- in-line 6 - radial engine (also called a hexagon arrangement ) with 12 cylinders. The cylinder banks are arranged at an angle of 60 °, the crankshaft 2- cranked and mounted in rolling bearings. The propeller was driven directly.

The development of the Town Dringes radial engines lost their aerodynamic disadvantage to its line engine. The engine was tested from 1927. The arrangement of two cylinders in one bank, it was possible to keep the diameter of the engine is smaller than in the conventional radial engine.

The H -1640 was the first flyable row radial engine of this configuration and was funded by the U.S. authorities, tested in a series of aircraft, so in the Thomas Morse XP -13 and the Curtiss XO- 18th Although authorization for civil aviation with a starting output of 600 hp was achieved, ultimately, the cooling problems of each rear cylinder could not be fixed, and the project was abandoned without that, there was a series production.

A similar engine is the Bristol Hydra. However, it has two 8-cylinder star - a total of 16 cylinders, which is why it is called a octagon engine. His two stars are arranged linearly ( in series) one after the other, which also distinguishes him as a series radial engine. Other examples of Hexagon engines are very rare. Among them are the German Junkers Jumo 222 with 24 cylinders and the Soviet, also 24 - zylindrige Dobrynin VD -4K.

Specifications

  • Type: Air-cooled 12 -cylinder radial engine with two 6 -cylinder stars consecutively
  • Power: 615 hp at 2200 min-1
  • Cylinder: 12
  • Motor diameter: 1143 mm
  • Bore: 142.8 mm
  • Stroke: 139.7 mm
  • Capacity: 26.87 l
  • Ignition: Split village magnetic
  • Carburetor: Stromberg NA - U8j
  • Specific consumption: 326 g / kWh
  • Weight: 408 kg
Curtiss Aeroplane and Motor Company Dobrynin VD-4K
210099
de