Lycoming O-235
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The Lycoming O-235 is a family of four-cylinder, air-cooled, horizontally opposed, piston aircraft engines that produce 100 to 135 hp, derived from the earlier O-233 engine.
A Lycoming O-235-C2C engine mounted in an American Aviation AA-1 Yankee light aircraft.
Lycoming IO-233
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The Lycoming IO-233 is a non-certified four-cylinder, air-cooled, horizontally opposed piston aircraft engine that produces between 100 hp and 116 hp.
Lycoming O-235
…a displacement of 233 cubic inches (3.82 L). The first O-235 model was certified on 11 February 1942. The O-235 was developed into the lighter-weight Lycoming IO-233 engine for light sport aircraft. Aero Boero AB-115…
IO-233-LSA light-sport aircraft engine.
Lycoming IO-233 installation in a FK Comet