Alternative Aircraft Engines or Automotive EnginesThe advantages of alternative engines is either issues of power versus price or the builder not wanting to deal with airworthiness directives. Far and away the three most popular alternative engines today are the Rotax series, Subaru and Mazda series of engines. Rotax engines are designed to operate at rpm's useful for flight and most applications do not require any reduction unit. The Subaru and Mazda engines being automotive require a reduction unit to get the engine rpm's down to an rpm useful for a propeller. The following list is a source reference where you can make contact for some of the more common alternative engines used on kit-built gyroplanes. You can always use something else if you want- that's why it says experimental in big letters on your gyroplane.
Geo: 62 hp & 92 hp: No known source but these engines have been used on some gyroplanes.
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