What happened
The incident occurred while a sailplane was being towed for takeoff behind an aircraft serving as the tow plane. According to the glider instructor, the initial acceleration phase appeared normal. However, as the combination of the tow plane and the glider neared the end of the runway, the instructor observed that the tug seemed to be experiencing difficulty accelerating to the necessary takeoff speed.
Believing the tow aircraft was unable to gain sufficient altitude or speed, the instructor made the decision to release the tow line at an approximate altitude of 5 feet. Following the separation, the instructor turned the glider toward a suitable area for landing. The sailplane subsequently touched down in what was described as a nose-down pancake landing.
Later investigation revealed that the speed brakes and spoilers had been fully deployed during the entire takeoff run and the subsequent short flight. This configuration significantly increased drag, likely contributing to the inability of the tow plane to accelerate normally and the glider's hard landing.