Accident Overview
A non-certificated pilot, who had been constructing the helicopter over several years, was operating the aircraft when it descended steeply and impacted terrain. The wreckage was confined to a small area, and a post-crash fire heavily damaged the center portion of the helicopter, including the engine and transmission.
Pilot Experience
The pilot had accumulated 5 hours of flight experience in 1988 and an additional 10 hours between July 19 and August 24, 1999. Although all flights were logged as 'dual,' family members reported that several of the eight flights conducted in 1999—all in the accident helicopter—were flown solo.
Witness Accounts
An ear witness reported hearing the helicopter depart, followed by a 'popping' sound and then silence. Shortly after, the witness observed a plume of smoke.
Mechanical Issues
A mechanic stated that the pilot had reported engine problems and borrowed a used carburetor. The pilot's logbook contained an entry dated August 16, 1999, with the remark: 'flight test changed carb running good.'
Damage and Indicators
The rotor blades exhibited minimal leading-edge damage. The engine/rotor RPM indicator displayed 0 RPM for the engine and 170 RPM for the rotor at the accident site.