Hirth HM 504

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The Hirth HM 504 is a four-cylinder air-cooled inverted inline engine. The 504 was a popular engine for light aircraft of the 1930-40s and it was used to power a number of Germany's trainer aircraft of WWII. The engine featured a cast magnesium alloy crankcase.^[1] The Hitachi Hatsukaze Model 11 was a Japanese licensed version.

Applications

Specifications (HM 504 A-2)^[2]

General characteristics

Type: 4-cylinder air-cooled inverted inline
Bore: 105 mm
Stroke: 115 mm
Displacement: 3998 cm³
Length: 945 mm
Width: 520 mm
Height: 780 mm
Dry weight: 107 kg

Components

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

Performance

Power output: 105 hp at 2500 RPM
Compression ratio: 6.2:1
Fuel consumption: 228 g/PSh
Oil consumption: 1.5-3 g/PSh
Power-to-weight ratio: 2.87 lb/hp at cruise speed

References

Notes

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

Bibliography

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

External links

Göbler-Hirthmotoren Company website

v t e Hirth and Heinkel-Hirth aircraft engines

Piston engines	HM 8 HM 60 HM 150 HM 500 HM 501 HM 504 HM 506 HM 508 HM 512 HM 515

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