Flight Events
A pilot observed that the engine ran rough at low RPM but smoothed out at higher power settings. Despite this finding, the pilot elected to take off but aborted the attempt upon realizing that the aircraft would not become airborne before reaching the end of the runway. After taxiing back to the departure end, another engine runup was performed, and a second takeoff was initiated.
Shortly after takeoff, according to the pilot, the aircraft began to lose power. A landing was made in unimproved terrain beyond the end of the runway.
Aftermath
During the landing roll, the nose gear struck a hole, causing the aircraft to nose over.
Examination
Examination of the wreckage revealed that the propeller control was in the high pitch (low RPM) setting.