I recently modded my Big Stick's wing in an effort to increase it's roll rate by removing the stock tapered wing tips and adding end plates instead. The plates were cut from 1/8" lite ply and follow the airfoil shape of the wing from L/ edge to the ailerons extending 1/2" above and below the wing. With a small percentage of aileron differential added they do make a quite difference, and many thanks to Ed Moorman for his assistance in getting it right.

Karol