RE: Shaft Coupler - Good/Bad Idea ?
I would want two servos in the event one quit. I have seen planes come back with one elevator servo burnt up, unplugged, horn fell off etc etc. If it had been just one servo, you ARE going to crash with no hope of saving the plane. With a Moki radial up front, I would want some margin of safety. Even if a servo locked hard over, you still have one to at least try to get the plane to hit flat instead of straight in.