On September 26, 2001, about 1100, central daylight time, a Robinson R22 Beta, N214WW, piloted by a certified flight instructor, sustained substantial damage on impact with terrain when the helicopter rolled over during a takeoff at East Troy Municipal Airport (57C), near East Troy, Wisconsin. The instructional flight was operating under 14 CFR Part 91. Visual meteorological conditions prevailed at the time of the accident. The instructor pilot was uninjured and the student pilot sustained minor injuries. No flight plan was on file. The local flight was originating from 57C at the time of the accident. The flight instructor stated: The student and I were practicing vertical takeoffs and landings. We use a two stage TO [take off] and lift off. The student was light on the skids and was attempting to correct for left drift and applied right cyclic with excessive collective. In a matter of 2 sec[onds] helicopter was on its right side. We were practicing at the airport on the airport property. The instructor stated that there was no mechanical malfunction or failure.