Franklin O-225

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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[]

Specifications (4A4-100)[]

Data from[citation needed]

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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