The ASK18 I flew from Four Counties gliding club at Syerston, back a few years, certainly enjoyed thermalling to the left rather that the right. It also enjoyed a large boot of right rudder on approach to land. Now, having carried out servicings on the said glider, I could find no asymmetry in the airframe, nothing likely to cause any bias, but flying it always led to a boot full of right rudder. Go figure, as our American friends might say !!
It certainly did! I put it down to the fact that DF cartwheeled it down the airfield from a winch launch. An ambulance was called but ended up taking his mother to the hospital as Dave was fine, but she had a few medical issues as a result of the crash.
Ka8 R85 was the same, right hand thermals only. When we winched it up on a chain hoist as part of the FGC display for families day, it was clear there was a bout a 2 inch bend in the fuselage.
We must know each other!