Hirth HM 60

The Hirth HM 60 was a four-cylinder inverted air-cooled inline aircraft engine designed in 1923 and first sold in 1924. The engine was of very high quality, and its sales success contributed to Hirth's rapid pre-war expansion. It was a popular engine for light aircraft delivering 80 hp (60 kW) at 2,300 rpm. Later Hirth engines built upon the HM 60's success and provided greater power with many of the same design features.[1]

HM 60
Type Inline piston engine
Manufacturer Hirth
First run June 1923
Major applications Klemm Kl 25




Specifications (HM 60R2)

General characteristics

  • Type: 4-cylinder air-cooled inverted inline engine.
  • Bore: 102 mm (4 in)
  • Stroke: 110 mm (4.33 in)
  • Displacement: 3.6 L (220 cu in)
  • Length: 856 mm (33.7 in)
  • Width: 391 mm (15.4 in)
  • Height: 688 mm (27.1 in)
  • Dry weight: 97 kg (214 lb)


  • Valvetrain: 1 inlet and 1 exhaust valve per cylinder.
  • Fuel system: Carburetor
  • Fuel type: 74 octane
  • Cooling system: Air-cooled


See also

Comparable engines

Related lists



  1. Gunston 1989, p.77.


  • Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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