NTSB Probable Cause

THE PILOT'S FAILURE TO PROPERLY LATCH THE CANOPY PRIOR TO TAKEOFF AND BY ALLOWING THE AIRCRAFT TO ENTER INTO A STALL DURING A CRITICAL PHASE OF FLIGHT AT AN ATTITUDE INSUFFICIENT TO RECOVER SAFELY. A FACTOR IN THE ACCIDENT WAS THE LOSS OF HIS EYEGLASSES WHEN THE CANOPY DEPARTED THE AIRCRAFT.