The airplane was substantially damaged at approximately 1139 Central time following a forced landing after initial takeoff. The private pilot and sole occupant was seriously injured. Visual conditions prevailed. According to a witness, the airplane was departing the runway and climbed to approximately 400 feet above ground level when the engine began “sputtering.” As the airplane began a “sharp” turn back to the runway, the engine quit and the airplane descended towards the field. Both main landing gear were separated from the airplane and both wings sustained impact damage.