Hirth HM 508

The Hirth HM 508 was an air-cooled, eight-cylinder, 60° cylinder bank angle inverted-V aircraft engine built in Germany in the 1930s.[1] It had a bore and stroke of 105 mm × 115 mm (4.1 in × 4.5 in) and developed 210 kW (280 hp) at 3,000 rpm.

HM 508
Type Inline inverted 'V' piston engine
Manufacturer Hirth
Major applications Messerschmitt Bf 108

Variants

HM 8U
HM 508A
HM 508B
HM 508C
180 kW (240 hp)
HM 508D
210 kW (280 hp) at 3000 rpm[2]
HM 508E
150 kW (200 hp)
HM 508F
HM 508G
HM 508H
180 kW (240 hp), low fuel consumption variant, with centrifugal supercharger geared at 3.86:1 crankshaft speed for long-range record breaking aircraft.

Applications

Specifications (HM 508D)

Data from Jane's fighting aircraft of World War II[2], Jane's all the World's Aircraft 1938[3]

General characteristics

  • Type: 60° V-8, inverted air-cooled piston engine
  • Bore: 105 mm (4.13 in)
  • Stroke: 115 mm (4.53 in)
  • Displacement: 7.97 l (486 cu in)
  • Length: 1,289 mm (50.75 in)
  • Width: 683 mm (26.89 in)
  • Height: 815 mm (32.09 in)
  • Dry weight: Dry 208 kg (459 lb): Fully equipped 221 kg (487 lb)

Components

  • Supercharger: Centrifugal supercharger geared at 4.46:1 crankshaft speed
  • Fuel system: 2x Pallas-Zenith VAH2 carbutettors
  • Fuel type: Gasoline
  • Oil system: Pressure system for crankshaft, pistons and reduction gear: splash lubrication for camshaft and supercharger
  • Cooling system: Air-cooled
  • Reduction gear: 1.5:1 - Stoekicht sun and planet gears
  • 1x Double Bosch magneto

Performance

  • Power output: Maximum 210 kW (280 hp) at 3,000 rpm: Rated power 192 kW (258 hp) at 2,790 rpm
  • Compression ratio: 6:1

See also

Comparable engines

Related lists

References

  1. Gunston, Bill (1989). World encyclopaedia of aero engines (Fully rev. 2nd ed.). London: P. Stephens. p. 77. ISBN 1-85260-163-9.
  2. Bridgman, Leonard, ed. (1989). Jane's fighting aircraft of World War II (1995 ed.). New York: Military Press. p. 294. ISBN 0517679647.
  3. Grey, C.G.; Bridgman, Leonard, eds. (1938). Jane's all the World's Aircraft 1938. London: Sampson Low, Marston & company, ltd. pp. 60d–61d.
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