NTSB Probable Cause

THE PILOT'S IMPROPER DECISION TO PERFORM AEROBATICS WHICH RESULTED IN THE DESIGN STRESS LIMITS OF THE AIRPLANE BEING EXCEEDED DUE TO EXCESSIVE AIRSPEED. CONTRIBUTING FACTORS TO THE ACCIDENT WERE THE PILOT'S OVERCONFIDENCE IN HIS AND THE AIRPLANE'S ABILITY, AND HIS LACK OF AEROBATIC FLIGHT EXPERIENCE.