Thanks for the tips guys! I am building a new bat with the grey flatbat fuse. It's not as sturdy as the black one, but should work out ok. CAUTION, the Spad web site does not show that you need to run the corrogations front to back when building a coro wing. I built my first one with them running spanwise, thus creating a triangular shape to the top of the wing when folding it over the spar, it flys ok but i'm sure there is more drag then I need with this shape. I have also increased the tail area by 25 % to dampen the "wobbles" on this one.