Have no idea. Think it depends on how violent you are going to fly it. I had all Hitec 605's (76#torque) on one cap that worked great. On my US I have Hitec 5625 (110oz) digitals on the wings/flaps and 5925 (103oz) digitals on the rudder and elevator just because I had them. My personal, completely unknowledgable, opinion is that a standard servo in the 40+ torque range may be pushing your luck a little. Something in the 70+ range would have a better safety factor.