RE: Servo extension & retract servo
It is not a Proportional servo and rotates ~120 deg so you need to make Mechanical Adjustments in order to match your installation. As with all servos, the shorter the servo arm, the more the servo arm has to move to push or pull the pushrod the same distance. I originally used RT88 on my H9 P47-150, but I eventually replaced them with the 791 servo because I needed more horsepower. I am using very short H9 metal servo arms.