Hirth HM 504

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 from	Hirth HM 60
Developed into	Hirth HM 500

The Hirth HM 504 is a four-cylinder air-cooled inverted inline engine. The 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.

Applications

Specifications (HM 504 A-2)

Data from Katz.^[2]

General characteristics

Type: 4-cylinder air-cooled inverted inline
Bore: 105 mm
Stroke: 115 mm
Displacement: 3,998 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 2,500 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

Wikimedia Commons has media related to Hirth HM 504.

Göbler-Hirthmotoren Company website

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

Two-strokes	F-23 F-30 F-33 F-36 F-263 2702 2703 2704 2706 3002 3003 3202 3203 3502 3503 3701 3702 3703

Gas turbines	HeS 1 HeS 3 HeS 8 HeS 30 HeS 40 HeS 50 HeS 60 HeS 011

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