On December 4, 2004, at 1430 central standard time, an unregistered experimental ultralight Goiden Circle T-Bird, piloted by an uncertificated pilot, was destroyed on impact with terrain following a loss of engine power. The pilot stated that the engine quit approximately 80 feet above ground level after takeoff from his private airstrip near Ft. Dodge, Iowa. Visual meteorological conditions prevailed at the time of the accident. The 14 CFR Part 91 personal flight was not operating on a flight plan. The pilot reported serious injuries. The local flight was originating at the time of the accident. The ultralight was last inspected on a reported date of November 10, 2004 and was powered by a Rotax engine. According to a Federal Aviation Administration inspector, the accident aircraft had not flown for several weeks and that the fuel tank was full prior to takeoff. No anomalies were reported.