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

Applications

Specifications (HM 504 A-2)

Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944[2], Der Flugmotor. Bauteile und Baumuster[3]

General characteristics

  • Type: 4-cylinder air-cooled inverted inline
  • Bore: 105 mm (4.13 in)
  • Stroke: 115 mm (4.53 in)
  • Displacement: 3.980 l (242.87 cu in)
  • Length: 945 mm (37.2 in)
  • Width: 520 mm (20.5 in)
  • Height: 780 mm (30.7 in)
  • Dry weight: 107 kg (236 lb) dry, unequipped
124 kg (273 lb) wet, equipped

Components

  • Valvetrain: 1 inlet and 1 exhaust under-valve per cylinder driven by pushrods and rockers
  • Fuel type: 80 Octane
  • Oil system: dry sump, pressure feed with scavenge
  • Cooling system: air-cooled

Performance

  • Power output:
  • 105 PS (104 hp; 77 kW) at 2,530 rpm (5 minutes) at sea level
  • 95 PS (94 hp; 70 kW) at 2,450 rpm (30 minutes) at sea level
  • 85 PS (84 hp; 63 kW) at 2,360 rpm (max. continuous / cruise) at sea level
  • Specific power: 26.35 PS/l (0.43 hp/cu in; 19.38 kW/l)
  • Compression ratio: 6.2:1
  • Specific fuel consumption: 0.228 kg/PS/h (0.510 lb/hp/h; 0.310 kg/kW/h) at max continuous
  • Oil consumption: 0.002–0.003 kg/PS/h (0.004–0.007 lb/hp/h; 0.003–0.004 kg/kW/h) at max continuous
  • Power-to-weight ratio: 0.98 PS/kg (0.44 hp/lb; 0.72 kW/kg)
  • B.M.E.P.: 9.37 atm (9.49 bar; 137.7 psi)
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See also

Related development

Comparable engines

Related lists

References
  1. Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2nd ed.). Cambridge, England: Patrick Stephens Limited. p. 77. ISBN 978-1-85260-163-8.
  2. Schneider, Helmut (Dipl.Ing.) (1944). Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 (in German) (Facsimile reprint 1986 ed.). Leipzig: Herm. Beyer Verlag. p. 396. ISBN 381120484X.
  3. Katz, Hans (Dr.Ing) (1940). Der Flugmotor. Bauteile und Baumuster. Luftfahrt Lehrbücherei Band 7. Berlin: de Gruyter.
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