Hirth HM 506

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

Specifications (HM 506A)

Data 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/PS/h (0.492 lb/hp/h; 0.299 kg/kW/h) at max continuous
  • Oil consumption: 0.003 kg/PS/h (0.007 lb/hp/h; 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.: 9.65 atm (9.78 bar; 141.8 psi)
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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. Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. pp. 60d–61d. ISBN 0-7153-5734-4.
  3. 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.
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