Event Summary
The pilot reported performing a rolling takeoff from a 2315-foot runway. He stated that as soon as the airplane broke ground during the takeoff roll, engine power was lost. The pilot retracted the landing gear to help clear a 42-foot dike at the departure end of the runway. After clearing the dike, he turned gradually to the left, and the left wing stalled. The airplane then descended behind the dike and contacted the river. The engine could be heard until the airplane reached the river.
Witness Observations
Two witnesses reported hearing loud, steady sounds from the airplane's engine and propeller. They observed the airplane in a high nose-up attitude and watched as it descended behind the dike. The engine sound continued until the airplane contacted the river.
Post-Accident Engine Check
During an operational check conducted after the accident, the engine performed at recommended levels, indicating no mechanical malfunction.
Performance Data
According to performance data provided by the FAA, at the given takeoff weight with a zero-degree flap setting, the airplane required 2850 feet of runway to clear a 50-foot obstacle. The charts were based on full power before brake release, suggesting insufficient runway length for the obstacle clearance under the conditions.
Probable Cause
The official probable cause was the pilot's inadequate preflight planning and preparation, and his failure to attain the proper liftoff airspeed, which resulted in a stall and collision with the terrain (river).