On June 30, 1993, at 1845 central daylight time, a Mooney M20J, N3740H, was substantially damaged following a forced landing due to the partial loss of power during climbout near Spring, Texas. The private pilot/owner of the airplane sustained minor injuries. Visual meteorological conditions prevailed for the personal flight. According to the David Wayne Hooks Airport tower operator, the airplane departed Runway 17R at 1842 and turned westbound. The pilot contacted the tower during the climb and requested to return to the airport because he had engine problems. The tower immediately cleared him to land on Runway 35L. The airplane was observed high on final approach. At the midfield point he was still fast and 10 feet off the runway. Near the departure end of the runway, the airplane was observed establishing a very high climb angle to clear powerlines and trees. Control was lost and the airplane impacted in a heavily wooded area in a nose down attitude. An engine disassembly revealed that corrosion and pitting were present throughtout the interior of the engine.