Does NOT work. Try rotating a servo with a burnt out motor, impossible, they lock SOLID and the torque of another servo will never overcome one. If you use very strong servos with a system such as the SWB or similar geometric system , you can easily use only half the torque, using a dual rate switch uses also half which SHOULD be MORE than adequate, if you choose your servos carefully (JR8711, 6311) and balance the stab. Of course there is no problem in overcoming a passively failed servo.

The other two points of failure are mechanical. 99.999% reliabilty should be eaily obtainable and slop should also be easily eliminated by careful manufacture and tensioning of the cables !

This SWB system is the best I have seen so far for creating a most reasonable degee of servo redundancy on a twin servo stab. Its not perfect but it goes LONG way to solving the problem.

Regards, David Gladwin.