The Continental C90 and O-200 are a family of air-cooled, horizontally opposed, four-cylinder, direct-drive aircraft engines of 201 in3 (3.29 L) displacement, producing between 90 and 100 horsepower (67 and 75 kW).

[1] Built by Continental Motors these engines are used in many light aircraft designs of the United States, including the early Piper PA-18 Super Cub,[2] the Champion 7EC,[3] the Alon Aircoupe,[4] and the Cessna 150.

[5] Though the C90 was superseded by the O-200, and many of the designs utilizing the O-200 had gone out of production by 1980, with the 2004 publication of the United States Federal Aviation Administration light-sport aircraft regulations[6] came a resurgence in demand for the O-200.

[18] The O-200 is an updated and upgraded version of the engine, achieving increased power of 100 hp (75 kW) as a result of higher maximum rpm.

[1] An engine designated the IOL-200, an O-200 variant modified with fuel injection and liquid cooling, powered the 1986 nonstop, non-refueled global circumnavigation flight of the Rutan Voyager.

Between 1991 and 1999, the aircraft won 45 of the 48 events in which it was entered, as well as winning three Louis Blèriot medals, four Pulitzer Trophies, and setting 16 speed records in its class.