Hi Harry,

thank you for your reply.
The servos I will use are already much more powerful then what suggested by the calculation (JR 3711HV) and in no way I will use a servo with a torque close to the one suggested.
Is too low and weak in the train and as you say the flutter can increase the torque needed to maintain the surface in position exponentially I guess!
I know that is a good thing to increase the ATV on the transmitter to gain resolution and precision, but is not practical in this application because the servo arm is already too small to deal with.
I think the program is quite precise and correct in the calculation but not being made to take into consideration high G-loads maneuver and flutter we have to introduce kind of safety margin or "k" factor like a multiplier? Maybe 1,5 or 2 could give a good safe margin!

Gianluca