Hi Morn

Yes the chain is our problem...

Just wondering if the flutter was a result of the servo or not. What started the chain?
Maybe the model was passing it's structual limit?

Like you and David says, putting in a bigger and stronger servo pushes the limit forward, but will not solve the problem if the rudder is not properly balanced, just move the limit a little.

Still no friend of small servos...

Regards
Anders Wikman