Accident Sequence
The pilot entered a right traffic pattern for Runway 16. At the midfield point on the downwind leg, the glider was 1,000 feet above ground level, and the pilot extended the spoilers. The base leg of the traffic pattern was flown at about 700 feet above ground. When the glider turned onto final approach, the pilot kept the right wing down and applied left rudder to initiate a slip. Determining the slip was ineffective, the pilot rolled the glider level for a moment and then entered the slip again.
Outcome
The glider touched down '90% down the runway' and traveled off the end. It became airborne again, turned to the right, and touched down a second time on a road. The glider then impacted several road signs with both wings before turning 180 degrees and coming to rest.
Pilot Statement
The pilot stated that the reason for the accident was an 'ineffective slip.'