The pilot was completing a 50 hour test flying program on the aircraft. Two previous sorties had been flown during the day, without incident. On this occasion, the pilot was conducting a glide approach, but when power was re-applied to go around, the engine delivered some 400 rpm less than normal. The pilot attempted to conduct a low level circuit, however the engine power continued to decay on the downwind leg. The turn onto base leg was conducted at about 100 feet, and shortly afterwards all power was lost. The aircraft landed heavily in a paddock. A post accident test run and inspection of the engine found that the power loss was caused by a spark plug failure. This accident was not the subject of an on-site investigation.
