The Hirth HM 501 was a 6-cylinder air-cooled inverted in-line engine that was developed by Hirth Motoren GmbH in the late 1930s, from the 4-cylinder HM 500 and used principally on the submarine-born Arado Ar 231.

HM 501
Type Inline piston engine
National origin Germany
Manufacturer Hirth Motoren GmbH
Major applications Arado Ar 231
Developed from Hirth HM 500

Applications

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Specifications (HM 501A)

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Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944[1]

General characteristics

  • Type: 6-cylinder air-cooled inverted in-line aircraft piston engine
  • Bore: 105 mm (4.13 in)
  • Stroke: 115 mm (4.53 in)
  • Displacement: 5.97 L (364.3 cu in)
  • Length: 1,272 millimetres (50.1 in)
  • Width: 485 mm (19.1 in)
  • Height: 662 mm (26.1 in)
  • Dry weight: 148 kg (326 lb) dry, unequipped
155 kg (342 lb) wet, equipped

Components

Performance

  • Power output:
  • 160 PS (158 hp; 118 kW) at 2,550 rpm for takeoff
  • 145 PS (143 hp; 107 kW) at 2,470 rpm (high performance) at sea level
  • 130 PS (128 hp; 96 kW) at 2,380 rpm (max. continuous ) at sea level
  • Specific power: 26.8 PS/L (0.43 hp/cu in; 19.71 kW/L)
  • Compression ratio: 6.2:1
  • Specific fuel consumption: 0.220 kg/PSh (0.492 lb/(hp⋅h); 0.299 kg/kWh) at max continuous
  • Oil consumption: 0.002–0.003 kg/PSh (0.004–0.007 lb/(hp⋅h); 0.003–0.004 kg/kWh) at max continuous
  • Power-to-weight ratio: 1.075 PS/kg (0.481 hp/lb; 0.791 kW/kg)
  • B.M.E.P.: 9.46 atm (9.59 bar; 139.0 psi)

References

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  1. ^ 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. pp. 394–395. ISBN 381120484X.

Further reading

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  • Nowarra, Heinz J. (1993). Die Deutsche Luftrüstung 1933-1945 Vola.4 - Flugzeugtypen MIAG-Zeppelin (in German). Koblenz: Bernard & Graefe Verlag. p. 101, 108-109. ISBN 3-7637-5468-7.