On July 25, 2003, at 1710 central daylight time, a Beech C23, N9361S, piloted by a private pilot, received substantial damage during an aborted touch and go landing on runway 22 (2,953 feet by 57 feet, dry asphalt) at Blackhawk Airfield (87Y), Madison, Wisconsin. Visual meteorological conditions prevailed at the time of the accident. The 14 CFR Part 91 instructional flight was not operating on flight plan. The private pilot and the certified flight instructor (CFI) were uninjured. The flight originated from Wittman Regional Airport, Oshkosh, Wisconsin, at 1615, en route to 87Y. The CFI stated in the National Transportation Safety Board (NTSB) Pilot/Operator Aircraft Accident Report, that the short field approach was normal with an approach speed of 73 knots. An obstacle on short final was cleared by 25 feet and a flare was initiated at the first third of the runway. The CFI stated that the pilot misjudged the flare height by about 5 feet and left the power at 1,500 rpm. The airplane ballooned again and the student added more power, which was then removed by the CFI. The CFI stated that the landing was okay. The student then retracted the flaps and added power somewhat slower that normal and beyond half way point down the runway which was an intersecting runway or about 1,200 feet of remaining runway. Immediately after full power was established, the CFI commented, 'It took you a long time to get the power in there' and about 1 second later, the pilot closed the throttle. The CFI stated that prior to the power reduction, they had enough runway remaining to clear the bushes and ditch by 5 to 10 feet. In the 1 second it took the CFI to decide whether to continue the abort, or attempt the take off, they lost any chance to clear the bushes. The airplane overran the runway going about 25 knots and stopped about 20 feet past the runway end. The Madison, Wisconsin, Automated Surface Observing System (ASOS), recorded at 1710: wind 180 degrees at 15 knots; visibility 10 statute miles; temperature 27 degrees Celsius; dew point 19 degrees Celsius; altimeter setting 30.01 inches of mercury. The CFI reported that at the time of the accident the MSN ASOS was reporting winds 190 at 18 knots gusting to 21 knots.