What happened
A Certified Flight Instructor (CFI) was performing a demonstration of a landing approach in a glider without utilizing the aircraft's dive-brakes. During the procedure, the aircraft landed long on the runway. As the landing roll progressed, it became apparent that the glider would not be able to stop before reaching the end of the runway.
To prevent the aircraft from overrunning into a cornfield located at the end of the runway, the pilot deployed the dive-brakes and executed a right turn toward an open, flat field. During this maneuver, the aircraft impacted two trees situated on the right side of the runway. The pilot was not injured.
The investigation
An inspection of the wreckage was conducted following the accident. The examination revealed no pre-accident flight control anomalies.