| O-225/4A/4A4 | |
|---|---|
| Type | Piston aircraft engine | 
| National origin | United States | 
| Manufacturer | Franklin Engine Company | 
| First run | 1945 | 
The Franklin O-225 (company designation 4A/4A4) was an American air-cooled aircraft engine that first ran in the mid-1940s. The engine was of four-cylinder, horizontally-opposed layout and displaced 225 cu in (4 L). The power output was between 75 hp (56 kW) and 125 hp (93 kW) depending on the version.
Variants
- 4A4-75
 - 75 hp (56 kW) at 1,950 rpm
 
- 4A4-85
 - 85 hp (63 kW) at 2,200 rpm
 
- 4A4-100
 - 100 hp (75 kW) at 2,550 rpm
 
- 4A-225
 - 100 hp (75 kW) at 2,800 rpm
 
Applications
- Cessna 160
 - Bendix 51
 - Bendix 52
 - Bendix 55
 - Dansaire Coupe
 - Eshelman Winglet
 - Government Workshops Triciclo-Experimental
 
Specifications (4A4-100)
Data from
General characteristics
- Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
 - Bore: 4.5 in (114.3 mm)
 - Stroke: 3.5 in (88.9 mm)
 - Displacement: 222.7 in³ (3.65 L)
 - Dry weight: 198 lb (90 kg)
 
Components
- Cooling system: Air-cooled
 
Performance
- Power output: 100 hp (75 kW) at 2,550 rpm
 
See also
Comparable engines
Related lists
References
- Notes
 
- Bibliography
 
- Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
 
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