Incident Overview
A pilot reported that before starting the engine by manually rotating the propeller, he set the brakes, throttle, and trim. He then exited the airplane and proceeded to rotate the propeller. When the engine started, it immediately accelerated to full rpm, and the airplane began moving forward on the taxiway at high speed.
Sequence of Events
The airplane continued its high-speed taxi until it veered off the taxiway. It then struck a hangar door, causing damage to the engine, both wings, and the right main landing gear.
Pilot Statements
In a conversation with the responding officer, the pilot stated that he had not placed chocks under the wheels and thought the brake was set. He further reported that there were no mechanical problems with the airplane.