I was just on the point of installing the elevator system in my Hawk on final gearing up.

The servo is a JR 8511, (same as a 8611.) On my set up I am usinga heavy duty JR servo arm withan X-cell helicopter ball link screwed into the arm with a ball link connecting to the push rod witha 4-40 sullivan link on the elev. arm.
I tried pushing down on the stabs. at full deflection and the servo arm seriously deformed (and these arms are STRONG) and the ball link popped off, there is clearly a LOT of mechanical advantage for the stab in the setup.

Back the installation, this time with a metal output arm and a clevis. I also note that there is too much slop in the stab., the holes in the horn are drilled too large for a Sullivan clevis.

Regards,

David Gladwin.