ASK 13 collision with tree during turbulence near Bettlachstock, Switzerland

On April 14, 1971, an Alexander Schleicher ASK 13 experienced a stall and collision with a tree while flying near Bettlachstock, Switzerland. The incident occurred when the glider encountered turbulence at low speed, causing it to stall and strike a tree. The pilot managed to regain control and safely landed the damaged aircraft at Grenchen airfield. Both the pilot and passenger were unharmed, but the glider sustained significant damage.