Incident
During a towed takeoff, witnesses observed the glider's spoilers extend after about 200 ft of ground roll. The tow pilot gave an arm signal to indicate a problem. The glider pilot reported that he misinterpreted the signal and elected to make an off-field landing. He was unaware that the spoilers were unlatched.
Sequence of Events
After the glider pilot misinterpreted the tow pilot's arm signal, he released from the tow plane. The glider touched down about 200 ft beyond the runway, with the right wing low, and sustained damage. The right wing spar was bent about 6 ft from the tip.
Pilot Qualifications
The pilot held a commercial, airline transport certificate but had only a student glider certificate.
Spoiler Handle Condition
Reportedly, the spoiler handle was not secured before takeoff.