The accident occurred during glider towing operations. After the third landing for the morning, the aircraft was being turned to back track on runway 22. The pilot stated that when power was applied to assist the turn being made with rudder and right brake, the aircraft immediately pitched 45 degrees nose down and the propeller was embedded in the earth strip. The wind was estimated to be 18-20 knots gusting to 25 knots from 230-240 degrees magnetic. The pilot stated that he considered inadvertent relaxation of back pressure on the control column, the power application, and possible excessive brake application causing sudden locking of the right-hand wheel were contributing factors.
