On April 7, 1995, at 1827 central daylight time, a Robinson S-12 Airaile, N53CR was destroyed when it nosed over during a forced landing at Sugartown, Louisiana. The pilot received serious injuries. Visual meteorological conditions prevailed. The following is based on the pilot/operator report. The pilot took off from his private airstrip at Sugartown at 1730 and climbed to an altitude of 350 feet. The engine lost partial power and the pilot made a successful forced landing on a private road. After making a full power static check, the pilot took off to return to his airstrip. At an altitude of 50 feet, the engine lost partial power. The pilot attempted to land at his airstrip but there was insufficient altitude and engine power available. He made a forced landing in a nearby field but during the landing roll, the airplane nosed over. In a telephone interview, the pilot said he had been unable to determine the reason for the partial power loss.