Sequence of Events
The pilot reported departing about 50 pounds under the gross weight limit. The paved runway, 8,999 feet long, was located at an elevation of 6,606 feet mean sea level (msl). Winds were down the runway at 20 to 25 knots, with a temperature of about 50 degrees Fahrenheit, resulting in a density altitude of approximately 8,100 feet msl. About three-quarters of the way down the runway, the pilot aborted the takeoff. He then taxied back to the terminal and offloaded a passenger estimated to weigh about 300 pounds. With this reduction, the pilot estimated the airplane was now about 350 pounds below the gross weight limit.
Pilot Actions
The pilot was cleared for a second takeoff. He started the takeoff with the mixture full rich and gradually leaned it to about 20 gallons per hour. He described the acceleration as slow but normal for a loaded airplane. After becoming airborne, at about 100 feet above ground level (agl), the airplane's climb performance seemed to worsen, and the pilot determined it was too late to abort. The control tower advised a 15-degree right turn toward lower terrain, which the pilot executed, clearing tree tops by about 50 feet. The pilot reported that all preflight and in-flight checks were normal. He performed additional in-flight checks of the engine systems, including simultaneous use of the fuel boost pumps, with no increase in performance.
Subsequent Collision
About 10 minutes into the flight, the airplane was still 50 to 100 feet above treetops and approaching high-tension power lines without enough altitude to clear them. The pilot started looking for a landing site. Subsequently, the airplane collided with trees about 14 miles from the departure point.
Post-Accident Findings
Examination of the magnetos by the manufacturer revealed numerous discrepancies affecting the optimum performance of the engine.