Franklin 4 series
| 4AC | |
|---|---|
 | |
| Franklin O-200 at the Hiller Aviation Museum | |
| Type | Flat-4 |
| Manufacturer | Franklin Engine Company |
| First run | 1938 |
The Franklin 4 (US military designations O-150, O-170, O-175, and O-200) was a series of air-cooled aircraft engines of flat-4 configuration produced in the 1930s and 1940s.
Variants
Data from:[1]
- 4A4-75
- 4A4-85
- 4A4-95
- 4A4-100
- 4AC
- 4AC-150
- (O-150)
- 4AC-150-40 - 40 hp (30 kW) at 1,875 rpm
- 4AC-150-50 - 50 hp (37 kW) at 2,300 rpm
- 4AC-150-A - 60 hp (45 kW) at 2,400 rpm
- 4AC-171
- 60 hp (45 kW) at 2,350 rpm - (O-170)
- 4AC-176
- (O-175)
- 4AC-176-B - 65 hp (48 kW) at 2,200 rpm
- 4AC-176-BA (O-175-1) - 65 hp (48 kW) at 2,300 rpm
- 4AC-176-C - 75 hp (56 kW) at 2,500 rpm
- 4AC-176-D - 80 hp (60 kW) at 2,650 rpm
- 4AC-176-F - 80 hp (60 kW) at 2,500 rpm
- 4ACG-176
- (O-175)
- 4AC-199
- (O-200)
- 4AC-199-B - 65 hp (48 kW) at 1,950 rpm
- 4AC-199-D - 85 hp (63 kW) at 2,500 rpm
- 4AC-199-E (O-200-1) - 90 hp (67 kW) at 2,500 rpm
- 4AC-199-H (O-200-5) - 113 hp (84 kW) at 3,500 rpm
- 4ACG-199
- O-200
- 4A-225
- O-225
- 4AL-225
- O-225
- 4A-235
- O-235
- Sport 4
- O-235
- O-150
- military designation
- O-170
- military designation
- O-175
- military designation
- O-200
- military designation
- O-225
- military designation
- O-235
- military designation
Applications
Franklin 4AC-150 fitted to a Piper J-3 Cub
- Aeronca 50 Chief
- Aeronca Arrow
- Culver Cadet
- Falconar F11 Sporty
- Fetterman Chickadee
- Goodyear Duck
- Interstate Cadet
- Langley Twin
- Payne MC-7
- Piasecki PV-2
- Piper J-3F Cub
- Piper PA-7
- Porterfield Collegiate
- Rearwin Skyranger
- Rose Parakeet
- Sackett Jeanie
- Stinson Voyager 10A
- Stout Skycar II
- Taylorcraft BF and L-2
- Vought-Sikorsky VS-300
Specifications (4AC-176-BA2, O-175-1)
(4AC-176-BA3 identical except for electric starter and generator)
Data from [2]
General characteristics
- Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
- Bore: 4 in (102 mm)
- Stroke: 3.5 in (89 mm)
- Displacement: 176 cu in (2.88 l)
- Length: 28.6 in (726 mm)
- Width: 30.2 in (767 mm)
- Height: 20 in (508 mm)
- Dry weight: 182 lb (82.6 kg)
Components
- Valvetrain: OHV, 1x inlet valve, 1x exhaust valve operated by pushrods
- Fuel system: 1x Marvel-Schebler MA-3P updraught carburettor
- Fuel type: 73 Octane gasoline
- Oil system: 40 S.U. secs (4.3 cSt) grade pressure fed at 40 psi (275,790 Pa), wet sump
- Cooling system: Air-cooled
Performance
- Power output: 65 hp (48.5 kW) at 2,300 rpm for take-off
- Specific power: 0.37 hp/(cu in) (16.837 kW/L)
- Compression ratio: 6:1
- Specific fuel consumption: 0.49 lb/(hp h) (0.298 kg/(kW h), 220 US gal/(hp h)) cruising
- Oil consumption: 0.003 lb/(hp h) (0.0018 kg/(kW h), 1.4 US gal/(hp h)) cruising
- Power-to-weight ratio: 0.357 hp/lb (0.587kW/kg)
See also
- Related development
- Franklin 2 series
- Franklin 6 series
- Franklin 8 series
- Franklin 12 series
- Franklin O-335
- Franklin O-805
- Related lists
Notes
- ↑ "Franklin, Aircooled Motors, Doman-Marks (US); Franklin Aircraft Engines, WSK-PZL (Poland) Part 1: Introduction and O-110 through O-300".
- ↑ Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 88–89.
References
- Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 88–89.
- Erickson, Jack. "Franklin, Aircooled Motors, Doman-Marks (US); Franklin Aircraft Engines, WSK-PZL (Poland) Part 1: Introduction and O-110 through O-300".
Further reading
- Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
External links
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