Chris,

Seal the control surface joins with diamond tape(sellotape but a lot stronger), this should help.

If its fiber hinges in the kit, as a last resort, I have used a drop of super glue in the middle of the hinge,
to stiffen them up, it solved my flutter problem on my Magic.


Engine , prop size, pich,your using ?


I have a Formula arriving in a couple of days, will be using a Saito 91 with it .

Xup