I don't have the mesrurement but I'm flying with the Himax motor and castle useing Power Unlimited batteries. I put the battery back over hanging about 3/4 of inch behind the landing pad,and it fly fine. The same has been for if you use a Petty we have try it and it made no differnce. If I get a chance I'll take a picture and put wing on and get some number for you. What are you useing for power? we have flown four of them and all same place.

Jr