Hirth HM 501
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
Specifications (HM 501A)
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
- Valvetrain: one intake and one exhaust under-head valve per cylinder actuated pushrods and rockers
- Fuel system: SUM 698/2 carburetor
- Fuel type: 80 octane gasoline
- Oil system: Dry sump with one pressure and two scavenge pumps
- Cooling system: Liquid-cooled, ethylene glycol
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/PS/h (0.492 lb/hp/h; 0.299 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: 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)
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References
- 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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Wikimedia Commons has media related to Hirth aircraft engines. |
- 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.
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