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The Franklin O-235 (company designation 4A-235 and Sport 4) is an American air-cooled aircraft engine that first ran in the mid-1960s. The engine is of four-cylinder, horizontally-opposed layout and displaced 235 cu in (4 L). The power output is nominally 125 hp (93 kW).

O-235/4A-235/Sport 4
Type	Piston aircraft engine
National origin	United States
Manufacturer	Franklin Engine Company/WSK-PZL
First run	1964

Variants

4A-235

130 hp (97 kW) at 2,800 rpm

Sport 4

125 hp (93 kW) at 2,800 rpm

Applications

• Duruble Edelweiss
• Hollman Sportster
• MacFam Cavalier
• Practavia Sprite
• PZL-110 Koliber
• Rallye-Club
• Skystar Kitfox
• Stewart Foo Fighter

Specifications (4A4-235)

Data from ^{[citation needed]}

General characteristics

• Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
• Bore: 4.625 in (117.5 mm)
• Stroke: 3.5 in (88.9 mm)
• Displacement: 235.2 in³ (3.85 L)
• Dry weight: 223 lb (101 kg)

Components

• Cooling system: Air-cooled

Performance

• Power output: 130 hp (75 kW) at 2,800 rpm

See also

Comparable engines

• Lycoming O-235

Related lists

• List of aircraft engines

References

Notes

Bibliography

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