At about 1800 Eastern time, the airplane was substantially damaged during a forced landing following a partial loss of engine power after takeoff from a private airstrip. The private pilot was not injured. Visual conditions prevailed. The pilot later reported the airplane sat for approximately a month prior to the accident flight, with its wing fuel tanks about one-quarter full. His preflight inspection included sumping the fuel tanks, and he thought he had removed all water and contamination from the fuel tanks. About 40 feet agl, the engine began to run rough. Since the engine was still producing partial power, the pilot attempted to return to the airport. However, the airplane impacted a field west of the airport and came to rest inverted. The pilot believed some contamination may have remained in the fuel.
