HM 506
Type Inline piston engine
National origin Germany
Manufacturer Hirth Motoren GmbH
Major applications Bücker Bü 133

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.

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

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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