19980711016539A

Failed to recover from an aerobatic maneuver at an appropiate altitude. Struk pile of gravel in gravel pit.(.4) the pilot was performing aerobatic maneuvers in a charted aerobatics practice box, part of which was over a gravel pile/construction site. The aircraft co-owner was on the ground watching the pilot's routine. He maintained radio communication with the pilot during the flight. The pilot informed the aircraft co-owner that he was finished and the co-owner started to head back to the airport. A ground witness saw the aircraft maneuver under a series of telephone lines and around construction equipment about 15 feet AGL or less. He stated that the aircraft appeared to be attempting to pull up as it impacted the gravel pit. The witness further reported that the aircraft appreared to have power throughout the maneuvering and he did not notice any decrease in engine noise. The pilot suffered serious injuries and does not remember the accident flight. The aircraft co-owner reported that the pilot did not report any mechanical problems with the aircraft during the accident flight. (-23) appears that the pilot failed to recover from aerobatic maneuvers at inappropriate altitude. Aircraft impacted a pee gravel pile located at a local gravel pit.