Same thing happened to me in Vermont in 1993. BOS to BTV in a Beech 1900. I'm driving. We were descending into BTV over the Green Mountains, passing through 10000 and just came out of the bases of the clouds and a glider was dead ahead. Pushed the plane nose down and got zero g's for a second or two and everyone screamed. Landed and turned around to face the passengers and every single head was leaning into the aisle staring at me thru the cockpit door that we weren't allowed to close.

Scariest moment in my aviation career. The Beech had no autopilot and that probably saved our lives as I had my hands on the controls. To this day I keep my hands on the controls below 10 always. People may think I'm weird but oh well nothing new there No transponder in gliders is a bad rule. Times have changed and the skies are too crowded.

I hope that if this incident is true it leads to some new rules regarding gliders and transponders.