Hirth HM 504

The Hirth HM 504 is a four-cylinder air-cooled inverted inline engine. The HM 504 was a popular engine for light aircraft of the 1930s-1940s, and it was used to power a number of Germany's trainer aircraft of World War II. The engine featured a cast magnesium alloy crankcase.[1] The Hitachi Hatsukaze Model 11 was a Japanese licensed version.

Hirth HM 504
Hirth HM 504 on display at the Flugausstellung Hermeskeil
Type Inline piston engine
National origin Germany
Manufacturer Hirth-Motoren GmbH, Stuttgart-Zuffenhausen
Major applications Bücker Bü 131
Developed into Hitachi Hatsukaze


Specifications (HM 504 A-2)

Data from Katz.[2]

General characteristics


  • Valvetrain: 1 inlet and 1 exhaust valve per cylinder
  • Cooling system: air


See also

Related development

Comparable engines

Related lists



  1. Gunston 1989, p.77.
  2. Dr Ing Hans Katz, Der Flugmotor, Bauteile und Baumuster, Matthiesen Berlin 1940


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