Franklin 6 series
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(Redirected from Franklin 6A3)
| Franklin 6 series engines | |
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| Type | 6-cyl. horizontally opposed air-cooled piston engine |
| National origin | United States |
| Manufacturer | Franklin Engine Company |
| Variants | Franklin O-335 |
The Franklin 6 is a series of air-cooled aircraft and helicopter engines of flat-6 configuration, produced from the 1930s to the 1970s, that found widespread use in helicopters and some light aircraft, (Military designation O-335, O-405 and O-425), as well as in the 1948 Tucker Sedan (with the engine modified for water cooling).
Contents
Variants
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Applications
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Specifications (6ACV-403)
Data from [3]
General characteristics
- Type: 6-cylinder air-cooled horizontally opposed vertically mounted helicopter piston engine
- Bore: 4.625 in (117.5 mm)
- Stroke: 4 in (101.6 mm)
- Displacement: 403 cu in (6.60 L)
- Width: 33.7 in (856.0 mm)
- Height: 43.4 in (1,102.4 mm)
- Dry weight: 458 lb (207.7 kg)
Components
- Valvetrain: OHV, 1x inlet valve, 1x exhaust valve operated by pushrods
- Fuel system: 2x Bendix-Stromberg PS-5C pressure updraught carburettors
- Fuel type: 80 Octane gasoline
- Oil system: 120 S.U. secs (25.1 cs) grade pressure fed at 55 psi (379,212 Pa), dry sump
- Cooling system: Air-cooled
- Delco-Remy 108567-541 vertical geared electric starter motor
Performance
- Power output: 245 hp (182.7 kW) at 3,275 rpm for take-off
- Specific power: 0.61 hp/in³ (27.758 kW/l)
- Compression ratio: 7:1
- Specific fuel consumption: 0.5 lb/hp/hr (0.304 kg/kW/hr, 225 US.gal/hp/hr) cruising
- Oil consumption: 0.015 lb/hp/hr (0.09 kg/kW/hr, 7 US.gal/hp/hr) cruising
- Power-to-weight ratio: 0.357 hp/lb (0.587kW/kg)
See also
- Related development
- Franklin 2 series
- Franklin 4 series
- Franklin 6 series
- Franklin 8 series
- Franklin 12 series
- Franklin O-335
- Franklin O-805
- Related lists
Notes
References
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Further reading
- Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
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