What happened
During a preflight inspection, the pilot observed frost covering the wings and the tail section of the aircraft. The pilot attempted to clear this frost using a rope and believed the lifting surfaces had been sufficiently cleaned prior to departure.
Immediately following takeoff from an off-airport gravel bar, the aircraft climbed to an altitude of approximately five to ten feet. At this height, the right wing stalled. The pilot reported that gusty winds were present during the accident, noting that a wind gust caught the aircraft and forced the right wing downward. As a result of the stall, the right wing struck the ground, causing the airplane to cartwheel.
The aircraft sustained substantial damage to the right wing, tail assembly, and empennage. The pilot was not injured.