Thanks for the replies, Guys! Yes, we do like to throw the planes around, but in the case of the F90's, we were both taking it very easy, or so we thought. No yank and bank stuff at all. Dick I see from the pics that you do build the ailerons very stiff, the difference seems to be that the size of the aileron is waaaay smaller than the just about, 1/3 wing area ones on the F90. I have included some fuzzy shots of my mass balancers. Any comments welcome