ORIGINAL: rxAxilleas
hi all ,
i am trying to setup a pull pull system on a rudder of a 85in span sbd plane .it is my first time using this setup and i am not sure.
how do i crimp the wire?(what do they mean by crimmping?}
the servo is a futaba s5303 with 223 oz torque. i think.
do i attach the wire directly to the servo arm or attach it to a belcrank and then attach the arm to the belcrank with a rod?
do i have to use swivel ball links?
2-56 or 4-40 ?
please help.
any information will be apreciated!
It's easier on the servo to connect it to a bellcrank. And connect your pull-pull cables to the bellcrank. That way you are putting the side load on the bellcrank bearings instead of your servo. The bellcrank bearings are usually a lot bigger and more robust.
4-40 on everything. 2-56 is for throttle pushrods on 40 size trainers.
Here is a pic of how to crimp the cables.
Run the cable through the little brass tube. Now pass it through the eye of the bolt or keeper on the bellcrank. Run it back through the brass tube. Now wrap it up and around the top of the brass tube and back through the tube one more time.
Cinch the wires up and get them all as tight as possible before you crimp. See second and third pics.
To crimp, simply squeeze the hell out of it with a pair of pliers. It should smash down a bit. That will crimp the tube nicely on the wire cables. Never had one come out.
In the last pic is one of my planes. I've circled the brass tubes. Those tubes were crimped exactly as I described above. Servos have sonce been switched to JR8411 digitals.
Thats a mock-up from last year. So, pardon the wiring mess inside. I've finished the plane, but haven't taken any pics yet.