On August 6, 2005, at 2000 central daylight time, an amateur-built Rosner Acro Sport II, N89CJ, sustained substantial damage when it nosed over during landing on runway 09 (1,320 feet by 135 feet, turf) at Reynolds Field (MN91), Princeton, Minnesota. The pilot was not injured. The Title 14 Code of Federal Regulations Part 91 personal flight departed Milaca (18Y), Minnesota, at 1945 and was en route to MN91. Visual meteorological conditions prevailed. No flight plan was filed. The pilot reported that he made a normal approach and did a three-point landing. He applied brakes immediately after touchdown. He reported that as he increased the brake pressure, he felt the tail start to come up. The airplane nosed over and came to rest inverted. The pilot evacuated the airplane without injury. The pilot reported that he had 58 flight hours in the make and model of the accident airplane.