True deadstick, no - and I hope not to have to, but I'm expecting significantly worse glide performance, and hope I'll be able to cope.. after all, the 172 at idle glides a lot worse than a duo discus in just about any config
As for shock cooling, plenty of cracked heads on pawnee glider tugs would indicate a genuine problem, as would the SOP's glider clubs come up with to look after the things.