According to pilot, he flew the visual approach at the 55-knot normal airspeed as prescribed by the airplane owner's manual. The pilot stated that during the flare, the airplane lost lift and impacted the runway. During rollout on the runway, the right main landing gear collapsed and the airplane ground looped 180 degrees, and came to rest on the right side of runway 35. Postaccident examination of the airplane by a Federal Aviation Administration inspector revealed that the right main landing gear attachment point and the engine firewall were substantially damaged. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation. The recorded wind at the airport, about the time of the accident, was from 320 degrees at 7 knots.