Incident Overview
During a flight intended for a stall demonstration, the pilot of a glider performed an intentional stall maneuver while in a left turn with approximately 15 to 20 degrees of bank. The pilot configured the glider into a stall in an effort to demonstrate the maneuver to the passenger. The glider stalled with both the nose and left wing dropping, and despite the pilot's attempts, it did not recover from the stall and subsequently entered a spin.
Recovery Attempts
Attempting to recover from the inadvertent spin, the pilot applied a full-forward stick input and full rudder deflection opposite the direction of rotation. The pilot's recovery efforts were unsuccessful, and the glider continued to spin until it impacted a lake.
Post-Impact Events
After impact, the glider's fuselage floated long enough for the pilot and passenger to exit the aircraft and swim to shore. The glider then sank in approximately 200 feet of water. The pilot did not report any preimpact mechanical malfunctions or failures.