Event Overview
A pilot was taxiing with the assistance of a wing walker to the takeoff position. During the stop, the wind had been increasing steadily and changed direction as the aircraft arrived at the takeoff point. As the pilot turned the aircraft into position on Runway 27, the right wing raised unexpectedly.
Attempted Corrective Action
In an effort to correct the situation and take off, the pilot added power. However, he was unable to maintain control. The aircraft tipped onto its left wing, struck a dirt bank, then cartwheeled and came to rest on its landing gear approximately 200 feet from where the occurrence began.
Passenger Harness Details
According to the pilot, he had the passenger fasten her single-strap shoulder harness prior to taxiing. However, when they reached the takeoff point, she had removed it, complaining that it was uncomfortable. As the plane began to roll, the pilot tried to protect her and slid from under his own shoulder harness. He stated that if she had kept her shoulder harness on, neither of them would have been injured.
Wind Conditions Reported
The pilot reported that the wind was variable from 230 to 290 degrees at 35 knots, gusting to 55 knots.