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.
Quick Facts HM 508, Type ...
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- HM 8U
- HM 508A
- HM 508B
- HM 508C
- 270 PS (266 hp; 199 kW)[2]
- HM 508D
- 280 PS (276 hp; 206 kW) at 3000 rpm[3]
- 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.
Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944,[4] Jane's fighting aircraft of World War II,[3] Jane's all the World's Aircraft 1938[5]
General characteristics
- Type: 60° V-8, inverted air-cooled piston engine
- Bore: 105 mm (4.13 in)
- Stroke: 115 mm (4.53 in)
- Displacement: 7.96 L (486 cu in)
- Length: 1,292 mm (50.87 in)
- Width: 683 mm (26.89 in)
- Height: 815 mm (32.09 in)
- Dry weight: 222 kg (489 lb) dry, unequipped
- 241 kg (531 lb) wet, equipped
Components
- Valvetrain: 1 inlet and 1 exhaust under-valve per cylinder driven by pushrods and rockers
- Supercharger: Centrifugal supercharger geared at 4.47:1 crankshaft speed
- Fuel system: 2x Pallas-Zenith 65 VAH2 carbutettors
- Fuel type: 87 Octane gasoline
- Oil system: Pressure system for crankshaft, pistons and reduction gear at 1.5–2.5 atm (22.04–36.74 psi; 1.52–2.53 bar): splash lubrication for camshaft and supercharger
- Cooling system: Air-cooled
- 1x Double Bosch magneto
- 280 PS (276 hp; 206 kW) at 3,000 rpm (5 minutes) at sea level
- 258 PS (254 hp; 190 kW) at 2,920 rpm (30 minutes) at sea level
- 225 PS (222 hp; 165 kW) at 2,790 rpm (max. continuous) at sea level
- 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: 0.005 kg/PSh (0.011 lb/(hp⋅h); 0.007 kg/kWh) at max continuous
- Power-to-weight ratio: 1.266 PS/kg (0.566 hp/lb; 0.931 kW/kg)
- B.M.E.P.: 10.2 atm (10.3 bar; 150 psi)
- Reduction gear: Stoekicht sun and planet gears 0.666:1
Comparable engines
Related lists
Gunston, Bill (1989). World encyclopaedia of aero engines (Fully rev. 2nd ed.). London: P. Stephens. p. 77. ISBN 1-85260-163-9. 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. 398–399. ISBN 381120484X. Bridgman, Leonard, ed. (1989). Jane's fighting aircraft of World War II (1995 ed.). New York: Military Press. p. 294. ISBN 0517679647. 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. 400–401. ISBN 381120484X. Grey, C.G.; Bridgman, Leonard, eds. (1938). Jane's all the World's Aircraft 1938. London: Sampson Low, Marston & company, ltd. pp. 60d–61d.
