The accident airplane was the 2nd of 5 similar models performing a low-level flyby over the runway. Witnesses reported that the airplane climbed and attempted to perform an aileron roll to the left shortly after the 1st airplane had successfully performed the maneuver. A videotape recording of the accident revealed that the roll rate slowed and the nose began to drop as the airplane rolled inverted. The airplane began a diving turn to the right, and subsequently crashed off to the right side of the runway. The wreckage examination revealed no evidence of any pre-existing mechanical malfunction or failure. A relative of the pilot reported that the pilot did not have much aerobatic experience and did not like to perform aerobatics. Examination of the pilot's logbook for the preceding year revealed no logged aerobatic experience. A fly-in was in progress at the airport when the mishap occurred. According to the fly-in organizer, no aerial demonstrations were planned.