Franklin O-500
The Franklin O-500 (company designation 6AL-500 and 6A8-215) was an American air-cooled aircraft engine that first ran in the mid-1940s. The engine was of six-cylinder, horizontally-opposed layout and displaced 500 cu in (8 L). The power output was 215 hp (160 kW).
| O-500/6AL/6A8 | |
|---|---|
| Type | Piston aircraft engine |
| National origin | United States |
| Manufacturer | Franklin Engine Company |
| First run | 1945 |
Variants
- 6AL-500
- (alternative designation) 215 hp (160 kW) at 2,500 rpm, with crankcase/prop-shaft extension for pusher installation.
- 6A8-215-B8F
- 215 hp (160 kW) at 2,500 rpm, with crankcase/prop-shaft extension for pusher installation.
- 6A8-215-B9F
- same as B8F but with different ignition components.
Specifications (6AL-500 / 6AB-215-B8F)
Data from Aircraft engines of the World 1950.[1]
General characteristics
- Type: 6-cylinder air-cooled horizontally opposed aircraft piston engine
- Bore: 5 in (127.0 mm)
- Stroke: 4.25 in (108.0 mm)
- Displacement: 500.76 cu in (8.2 L)
- Length: 66.3 in (168.4 cm)
- Width: 33.9 in (86.1 cm)
- Height: 27.4 in (69.6 cm)
- Dry weight: 488 lb (221 kg)
Components
- Valvetrain: 1x OHV exhaust and inlet per cylinder operated by push-rods and rockers
- Fuel system: 1x Marvel-Schebler MA4-5 updraught carburetor
- Fuel type: 80 octane Gasoline
- Oil system: Pressure feed at 35–45 psi (2.4–3.1 bar)
- Cooling system: Air-cooled with cooling fan and shrouds
Performance
- Power output: 215 hp (160 kW) at 2,500 rpm
- Specific power: 0.43 hp/cu in (19.6 kW/L)
- B.m.e.p.: 136 psi (9.38 bar)
- Compression ratio: 7:1
- Specific fuel consumption: 0.5 lb/(hp⋅h) (0.30 kg/kWh)
- Power-to-weight ratio: 0.44 hp/lb (0.72 kW/kg)
References
- Wilkinson, Paul H. (1950). Aircraft engines of the World 1950 (8th ed.). London: Sir Isaac Pitman & Sons Ltd. p. 152-153.
Further reading
- Gunston, Bill (1986). World encyclopaedia of aero engines. P. Stephens. p. 57. ISBN 9780850597172.
- Gunston, Bill (2006). World Encyclopaedia of Aero Engines (5th ed.). Stroud: Sutton Publishing. ISBN 978-0-7509-4479-3.
- Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2nd ed.). Cambridge, England: Patrick Stephens Limited. ISBN 978-1-85260-163-8.
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