RE: Towing gliders to altitude, risky?
There will certainly be those to give you more info than I, but my understanding is that it is fairly hard to tow a polyhedral sailplane. I saw a video of a Riser 100 poly being towed, and from the moment it left the ground it was weaving from left to right fairly violently. Maybe that was a once in a while occurance, I really don't know.