At about 1108 Eastern time, the airplane experienced a partial loss of engine power during climb shortly after takeoff. Visual conditions prevailed. The airplane was substantially damaged, but the commercial pilot and one passenger were not injured. The purpose of the flight was to fly the airplane following extensive engine maintenance. The pilot intended on orbiting the airport for one hour, then land and have the mechanic/passenger inspect the engine. After takeoff, when the flight was between 50 and 75 feet agl, he noticed a partial loss of engine power. The pilot turned away from trees toward an open field. The airplane came to rest upright in a left-wing-low attitude, which resulted in fuel leaking from the left fuel cap.
