20211130020879A

Accident involves an attempted high-speed taxi "shake-down" of a newly restored antique aircraft. The pilot's intention was to enter a grass infield area for a high speed taxi eastbound on the grass, then complete a normal taxi on the paved taxiway, and depart runway 6. There was a loss of control and overturning of the aircraft when it became airborne for a brief moment, then settled onto the grass and transitioned to a paved area on the airport's east side. While the pilot reported logging considerable experience in the type aircraft involved, he was operating the particular aircraft for the first time since completion of its full restoration days ago. The airplane was equipped with a lift optimized wing and mechanical brakes, two systems that the pilot was unaccustomed to throughout his experience in the type, and he stated that he chose to utilize the grass infield for his high-speed run because he believed that that surface would be ?more forgiving? Than the adjacent runway. Once up to speed however, the pilot stated that the ?lift wing? Caused the airplane to leave the ground without expectation, and resulted in his applying the dissimilar brakes in the grass area as the aircraft settled and transitioned from the grass area to the paved area ahead. The pilot described the brakes as ?grabby? And stated that he discovered the amount of brake application used in the grass area was suddenly excessive once the aircraft?s wheels met the paved surface area ahead. The pilot also describes unfavorable and variable winds opposite the normal flow of traffic as contributing to the airplane?s overturning, along with the aforementioned causes.