tanks guys i balanced my cub @ 27.5 % it worked out too be 3.5 inchs the fox 78 engine did however fly it verrryyy scale like!!!! not much power would fly backwards in a 10 mile an hour wind!!not many flying days under ten where im from mid mich!! so i put a asp 180 in the front flys real fine now a bit much power now but thats what a throttel is for!!! again thanks guys greg!!!!