The Hirth HM 506 was a six-cylinder air-cooled inverted inline engine that was developed from the earlier four-cylinder HM 504.[1] The HM 506 was a popular engine for light aircraft of the 1930s to 1940s and powered the Bücker Bü 133A model trainer. The engine featured a cast magnesium alloy crankcase.
| HM 506 | |
|---|---|
| Type | Inline piston engine |
| National origin | Germany |
| Manufacturer | Hirth Motoren GmbH |
| Major applications | Bücker Bü 133 |
Applications
edit- Bücker Bü 133 A
- Fieseler Fi 99
- Fieseler Fi 157 (UAV prototype)
- Fieseler Fi 158 (UAV prototype)
- Gotha Go 241
- Klemm Kl 35 B (D-ERLQ)
Specifications (HM 506A)
editData from Jane's All the World's Aircraft 1938,[2] Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944[3]
General characteristics
- Type: 6-cylinder air-cooled inverted inline
- Bore: 105 mm (4.13 in)
- Stroke: 115 mm (4.53 in)
- Displacement: 5.976 L (364.68 cu in)
- Length: 1,276 mm (50.2 in)
- Width: 490 mm (19.3 in)
- Height: 735 mm (28.9 in)
- Dry weight: 149 kg (328 lb) dry, unequipped
- 174 kg (384 lb) wet, equipped
Components
- Valvetrain: 1 inlet and 1 exhaust valve per cylinder, operated by push-rods and rockers
- Fuel system: 2x SUM 713/1 down draught carburetters, automatic mixture control and suitable for inverted flight.
- Fuel type: 80 Octane
- Oil system: Fresh oil, metered for each cylinder. Rockers in oil bath.
- Cooling system: air
Performance
- Power output:
- 160 PS (158 hp; 118 kW) at 2,500 rpm (5 minutes) at sea level
- 145 PS (143 hp; 107 kW) at 2,420 rpm (30 minutes) at sea level
- 130 PS (128 hp; 96 kW) at 2,330 rpm (max. continuous / cruise) 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: 0.003 kg/PSh (0.007 lb/(hp⋅h); 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.: 9.65 atm (9.78 bar; 141.8 psi)
References
edit- ^ Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2nd ed.). Cambridge, England: Patrick Stephens Limited. p. 77. ISBN 978-1-85260-163-8.
- ^ Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. pp. 60d–61d. ISBN 0-7153-5734-4.
- ^ 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.