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Proving it was a SparrowHawk III Gyroplane Quick-build Kit is sufficient, which is easy to do. The builder does not need to prove compliance with the 51% rule. The Federal Aviation Administration (FAA) has evaluated the SparrowHawk III Gyroplane Quick-build Kit and determined that it qualifies to be included in the FAA listing of Eligible Amateur-Built Aircraft Kits under the "51% rule." This means that the homebuilder who buys and builds a SparrowHawk III only needs it inspected after it is built. Average build time of the SparrowHawk III's quick build format is now down to 100 hours or less for experienced builders or around 250 to 300 hours for builders that don’t have any prior experience. AAI also offers add-on kit options for an additional price. This homebuilt aircraft kit provides everything you need to fly except fuel, and includes a 165 hp Subaru EJ-25 power plant, flight instruments, propeller, and rotor blades. With thousands of flight hours on American Autogyro designed SparrowHawk gyroplanes, the SparrowHawk III is widely accepted as a fun, affordable, and safe gyroplane. Stability needs PROPERLY DESIGNED 'centerline-thrust' to be 'hands-off stable.' The SparrowHawk III is centerline and hands-off-stable.