Accident Sequence
A pilot departed on a cross-country flight in an experimental airplane. During climb through 8,000 feet, the engine lost manifold pressure, and the pilot was unable to restore climb power. He diverted toward a nearby airport and planned a straight-in approach. Due to low altitude, the pilot delayed landing gear extension until close to the runway. When extended, there was insufficient time for full gear extension, and the airplane touched down approximately 100 feet short of the runway with partial gear extension.
Examination Findings
Post-accident examination of the engine revealed the remains of a paper towel in the turbocharger and intercooler. The engine was a converted automotive V-8 type, equipped with an air filter. Additionally, a 5-inch by 10-inch opening at the back of the engine allowed unfiltered air into the air intake manifold.
Pilot Statement
The pilot had completed phase 1 flight time requirements, and the accident flight was the first flight following an inspection during which the engine cowling had been removed. Paper towels were used as wipes on both the engine and airframe. The pilot was assisted by several persons, some of whom were not rated aviation mechanics. The pilot later reported that a paper towel had inadvertently been left on top of the engine.