At about 1045 eastern time, a homebuilt Preiss Vans RV-9A was substantially damaged after a loss of control on landing. The pilot received serious injuries and the passenger received minor injuries. The pilot stated that as he landed, he realized that he had inadvertently lined up on the shorter runway, that he was too fast, and that he had forgotten to lower the flaps. After his first contact with the turf runway he lowered the flaps. The airplane porpoised and on the fourth touchdown the propeller hit the ground and the airplane nosed over. The pilot remarked that the 1,725-foot runway would have been long enough if he had slowed down sufficiently prior to landing.