On his third landing of the day, the pilot of an amateur built Vans RV-8 touched down, in a tail low attitude, near the displaced runway threshold. The airplane began to veer left and right, so the pilot applied power and climbed to an altitude of 30 to 50 feet. The airplane then rolled and turned left before it overflew the left edge of the runway and parallel taxiway, while continuing to turn past a heading perpendicular to the runway centerline. The airplane continued the left turn, in an approximate 30-degree bank, and began to descend toward a low wetland adjacent to the runway. The aircraft struck the ground left wingtip first, and the left wing and left main gear separated from the airframe. The airplane then cartwheeled counterclockwise coming to rest upright on the right main landing gear and forward fuselage. Review of Federal Aviation Administration records revealed that the accident flight was the pilot's second incident in an RV-8. Approximately one year prior to the accident, in a different RV-8, the pilot also experienced a loss of control while practicing landings, during which the airplane veered off the left side of the runway and struck a taxiway light.