ball links at both ends?

[sportflyer1]

The geometrical configuration of rudder servo arms (rudder servos located at rear of fuselage) to rudder horns is such that the best way is to use ball links at both ends. However the rudder control horn is one of those large Dubro type heavy duty horn ( not the screw bolt type) which is normally used for clevises . Can a ball link be used on these? ...seems kind of thin to fasten on a 4-40 ball link.

[canavanbob]

I would not do it, the ball link will put a twisting load on the control horn. On questions like this it is best to describe the plane it is to be used on.

[sportflyer1]

Sorry, its on a GP Sukhoi SU31 ARF . I suppose I should use a Clevis but make sure its the locking type .

[pumatraca]

Clevis sometimes, can make a big hole on the horn, and this will flutter the ailerons for example, then I prefer ball links at both ends.-

[JoeAirPort]

How about a 2-56 ball end on the rudder side? The thing is the clevis holds the horn on center where the ball end mounts off center of the horn....so it tends to twist it. That's the main problem me thinks.

[billd3]

	Quote: Originally Posted by JoeAirPort
	How about a 2-56 ball end on the rudder side? The thing is the clevis holds the horn on center where the ball end mounts off center of the horn....so it tends to twist it. That's the main problem me thinks.

What size plane are you thinking about using that 2-56 ball end on? If it's a giant, I would'ntuse 2-56 on ANY control surface.

[RTK]

If it is a single phenolic etc. type arm on the rudder and you want to use ball links, just put a ball link on either side of that and on the servo arm too, 4 total. But, maybe I am not understanding you correctly, a picture would help

[kev40]

I drill my control horns all the time for ball links, and never had any problems. Make sure the links are centered so that you have side to side roll at both ends that way they wont bind up and twist the horn.