Incident Overview
During a ferry flight, the pilot encountered a partial loss of engine power, necessitating an emergency landing in a field. The pilot reported that the engine exhibited four vibrations followed by a missing sensation. Subsequently, the engine rpm dropped to 1200, and the aircraft could not maintain altitude. The pilot discovered that by pumping the throttle, he could occasionally increase the rpm above 1200.
Examination Findings
A post-incident examination of the engine revealed a separation of the right exhaust flame tube. This separation was determined to have caused the partial loss of power experienced during the flight.
Summary
The event involved a ferry flight where a partial power loss occurred due to a mechanical failure. The pilot's actions included an emergency landing in a field and intermittent throttle pumping to manage engine rpm. The root cause identified was a separated right exhaust flame tube.