Background
The pilot had completed seven or eight touch-and-go landings without incident. The final approach for the last touch-and-go proceeded normally until the airplane was about 70 feet above the ground.
Event
While on final approach at approximately 70 feet above ground level, the airplane began to sink uncontrollably. The pilot reported adding power, but the descent continued until the airplane collided with the ground.
Weather Information
A review of recorded weather data for the airport indicated that at 1021, the wind was from 150 degrees at 8 knots, with direction variable between 121 and 181 degrees; the sky was clear. At 1100, the wind was from 150 degrees at 9 knots, gusting to 15 knots, with direction variable between 131 and 201 degrees; the sky was scattered at 3,000, 5,000, and 9,000 feet. Satellite imagery revealed the presence of cumulus clouds in the area.