Incident Summary
The pilot reported that before departure, the engine start and run-up were normal. During the ground roll for takeoff, the aircraft accelerated normally. However, after rotation at an altitude of approximately 100 feet above ground level, the engine RPM dropped from 2,600 to 2,200. A witness observed puffs of black smoke trailing the aircraft.
Actions Taken
The pilot initiated a turn to return to the airport, but the engine RPM continued to decrease. He then rolled the wings level, and the aircraft subsequently collided with a tree and then the ground.
Investigation Findings
Examination of the engine revealed that the partial loss of engine power was due to a foreign object obstructing the inlet of the carburetor.