NTSB

Probable Cause: The pilot’s diverted attention while taxiing which resulted in his failure to maintain clearance from the skip loader.

The pilot’s failure to maintain directional control during landing. Contributing was the pilot getting his shoe caught in the rudder pedal.

The pilot’s inadequate preflight of the fuel quantity which resulted in a loss of engine power due to fuel starvation during cruise flight.

The front seat pilot’s failure to maintain directional control during the landing roll, and the rear seat pilot’s delayed remedial control inputs that subsequently resulted in a ground loop. Contributing to the accident was a lack of communication by both pilot’s to establish clearly defined pilot-in-command roles prior to the accident flight.

The failure of the pilot to adequately maintain a safe distance from the airplane’s propeller, which resulted in a serious injury when the propeller struck his hand.

A primary control (aileron) system anomaly that progressively worsened during a test flight that resulted in a loss of control. The reason for the anomaly was not determined due to impact damage.

The pilot’s excessive brake input while he attempted to maintain directional control during landing roll.

The student pilot/builder’s addition of winglets to the stabilator, which resulted in flutter and overstress failure of the stabilator control horn.