On July 24, 2005, about 1630 eastern daylight time, a WACO AQC-6, was substantially damaged while landing at the St. Mary's Airport, Leonardtown, Maryland. The certificated commercial pilot and passenger were not injured. Visual meteorological conditions prevailed and no flight plan had been filed for the local flight conducted under 14 CFR Part 91. The airplane was landing on runway 11, a 4,150-foot-long, 75-foot-wide, asphalt runway. According to the pilot, the approach and touchdown were normal. Shortly after touchdown, the right wing began to rise, and the airplane began to swerve to the left. The pilot attempted to correct with aileron and rudder input; however, the right wing continued to rise, and the left wing struck the runway. The airplane then veered to the right, and nosed over. Examination of the airplane by a Federal Aviation Administration inspector did not reveal any mechanical malfunctions. Nor did the pilot report any. The pilot reported 4,246 hours of total flight experience, which included 33 hours in the same make and model as the accident airplane. Winds reported at airport located about 8 miles east-southeast of the accident site, at 1555, were from 160 degrees at 5 knots. The pilot reported that the wind at the time of the accident was from 200 degrees at 5 knots.