Hey thanks loads Ben. The 12 to 15 percent was what I was looking for. For your interest. If you remember Chucks Hooker (1977) than you will know what I'm scaleing up. The 60 in. ver is a dream. It will do axle rolls in a straight line all day with just Ail input. I would love to see what one of these do with a 100/120 in. wing. I also plane to rework how the wings go on. If you have seen how Hanger 9 has the wings on the 1/3 scale sukhoi with the graphite tubes then I think I want to try that. All I have to do is find someone that has thoses two telescoping tube sizes. I will get out the Calculator and give it a look see. Thanks Again. Hooker53