Originally Posted by
RCISFUN
As has been pointed out the large span between horns might not be ideal, but can be overcome using the methods you described.
The other observation I have is with the servo behind the air brake it appears that you can not use the mechanical advantage of the servo arm position, (i.e. directly away and in line with the linkage) when the air brake is fully deployed with the servo arm that is shown.
Two evils! If the pushrod is pushing then it will flex (OK maybe shorter that way around) If Marc had used a standard metal arm and a ball link he could have the arm inline..but then all the load is on the servo output spline and servo bearings. The forked clevis arm reduces that.
Ultimately I prefer an air ram, servos are loaded always and if they get a stuck gear you can't land with the airbrake open to slow it (without perfect timing on a switch) as the servo will be destroyed, an air ram can compress.
With the 8511 holding power and expected slow flight from big flaps, it won't be loaded too much/too long.