According to the pilot in the retractable landing gear airplane, his normal approach to the backcountry grass airstrip was to follow the terrain until established on a "5-10 second" final approach. The pilot recalled that there was a five-knot tailwind at the airstrip during the approach. On final, he increased the flaps, the airspeed was 70 knots, and the airplane touched down on the approach end of the runway. However, he reported that he did not extend the retractable landing gear and following the touch down, the airplane slid about 1,000 feet down the runway. The airplane sustained substantial damage to the fuselage longerons and the firewall.
The pilot reported that there were no mechanical failures or anomalies with the airframe or engine, that would have prevented normal operation.