At 17:50 CST, an amateur-built Lancair 235/320 was damaged during a forced landing following the separation of the propeller in flight near Sterling City. The pilot was not injured. The flight was en route from Kerrville to Big Spring, Texas. The pilot was cruising at 12,000 feet when he felt a vibration and smelled an odor that resembled wire burning. He was cleared to descend to 6,500 feet and, when leveling off at 6,500 feet, the propeller separated from the engine. The pilot selected a road to land on but, during the approach, struck a power line and bounced on the shoulder of the road. The right wing struck a sign and separated from the airplane.