When I steam bent three 1/4 inch layers of ash to make my deck beams on my Yare I guessed how much springback there would be. I should of guessed a little higher, a little more knee room acheived with a tighter radius would have been nice. Well, I stumbled onto a formula to determine springback. I hope it helps some of you plywood kayak builders.

http://www.taunton.com/fw/features/techniques/13springback.htm