The pilot reported that purpose of the flight was to conduct two takeoffs and landings as part of a short takeoff and landing (STOL) competition. Runway 20 was in use, with winds from the south at 5 knots, gusting to 10 knots. Following the second takeoff, ground personnel advised the pilot that wind conditions had increased. During the second landing, at an altitude of about 20 ft above ground level (agl), the pilot inadvertently allowed the airplane’s airspeed to decay as it approached the intended touchdown point, and the left wing stalled. He attempted to correct for the stalled condition but was unable to regain control of the airplane. A spectator positioned near the accident site recorded the accident sequence. Review of the spectator-recorded video showed the airplane descending from about 20 ft agl in a nose-up attitude. The left wing dropped and contacted the ground, and the airplane rotated to the left. The nose subsequently impacted the ground, and the airplane continued to rotate left and came to rest about 180° from its original direction of flight. The airplane’s left wing and fuselage sustained substantial damage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.