On July 30, 2005, about 2000 central daylight time, a Luscombe 8F, N1841B, piloted by a private pilot, sustained substantial damage on impact with terrain during an aborted takeoff from the Sylvania Airport, near Sturtevant, Wisconsin. The personal flight was operating under 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed at the time of the accident. No flight plan was on file. The pilot reported no injuries. The local flight was originating at the time of the accident. The pilot's accident report stated: I was flying the airplane in the pattern on a grass runway. On the accident take off, the airplane approached flying speed and hit a bump on the runway which caused the airplane to suddenly veer to the left. Another bump cause the airplane to become airborne before a positive rate of climb could occur. The airplane was going to hit a berm so I closed the throttle and did what I could to minimize the impact and damage. At 1953, the reported weather at the Kenosha Regional Airport, near Kenosha, Wisconsin, was: Wind 140 degrees at 5 knots; visibility 10 statute miles; sky condition clear; temperature 23 degrees C; dew point 18 degrees C; altimeter 30.19 inches of mercury.