What is the formula for calculating the size of a servo needed to controll the elevons on a flying wing? I am building a 96 inch draco out of all balsa. I have a 96 inch draco built with coroplast and i used two servos on each elevon because the coroplast likes to bend at such long lengths, the elevons run the full length of the wing.I would like to only use one servo on each half on the wood verson. Any help would be great.I can post pics of the coro version if anyone is interested. It flys great.