• Source: 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. 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.




Variants


HM 8U

HM 508A

HM 508B

HM 508C
270 PS (266 hp; 199 kW)
HM 508D
280 PS (276 hp; 206 kW) at 3000 rpm
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


Ambrosini S.7
Gotha Go 146
Gotha Go 149
Heinkel He 116
IMAM Ro.63
Messerschmitt Bf 108
Siebel Fh 104
Weserflug We 271 Experimental aircraft




Specifications (HM 508D)


Data from Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944, Jane's fighting aircraft of World War II, Jane's all the World's Aircraft 1938




= 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




= Performance

=
Power output:
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




See also



Comparable engines

Argus As 10
Related lists

List of aircraft engines




References

Kata Kunci Pencarian:

• Hirth HM 508
• Hirth
• Hirth HM 500
• List of aircraft engines of Germany during World War II
• Hirth HM 504
• Hirth HM 60
• Hirth HM 512
• Hirth HM 501
• Hirth HM 515
• Heinkel HeS 011