pull-pull rudder set-up
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pull-pull rudder set-up
I an setting up a pull-pull rudder on a Phoenix Extra 330S, and have never done a pull-pull set-up before. The instructions say to use crimping pliers once you feed the cable through the crimp connector. I don't have crimping pliers, but should be able to make the connection with needle nose pliers. My question is whether or not I should solder the crimp connections? This would give me more confidence in the connection, but I wonder if the heat would weaken the cable near the connection. I really don't think it would, but I'd really appreciate some input from somebody with experience with this type of connection. Thank you in advance for your helpful response.
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RE: pull-pull rudder set-up
Thanks to all of you for your helpful responses!!!!!! I have spare cutting pliers that I can blunt the edges on to do the crimping. And now I know that soldering was a bad idea. Thanks again!!!
#7
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RE: pull-pull rudder set-up
Yes, a pair of Dykes (cutting pliers) work well. You do not even have to dull the edge, just go easy on the force you use. If this is your first pull-pull system here are two very important things to watch out for. First, make sure you do not have any negative Ackerman induced in the setup, positive is okay as long as it is not excessive. Second, do not have the lines to tight, just enough to have no slack at neutral position. If you do not know what Ackerman is, you can Google it or do a search for it here on the forums. It is the relative placement of the attach points on the servo arms/control horns relative to the pivot point of the servo and moveable surfaces and how it effects line tension as the surface is moved off center.
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RE: pull-pull rudder set-up
Thanks for your input Rodney. I just spent the last hour or so reading about the "Ackerman" effect online. I was familiar with the principal, but was not aware that it was called the "Ackerman Effect". I used to use the same principal to get differential aileron travel in the old days, before we had "Computer" radios. The input from all of you has been very helpful, and much appreciated.
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RE: pull-pull rudder set-up
I account for all of Rodney's points, which are good points, by way of adjustable clevises on the servo with a spring between the clevis and the wire. The clevis is, well, for adjusting and the springs maintain tension in the circuit while alleviating one side rotating farther than the other during operation.
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RE: pull-pull rudder set-up
I don't have crimping pliers either. I used to use the side-cutters on pliers VERY carefully and it worked fine. Now I use round-jaw pliers and put in the three crimps that combatpigg mentioned. I also crimp slightly diagonally to make each crimp slightly longer. No failures or cables broken at crimps but I don't honestly know if the diagonal is a good idea or not. No problems though. I don't do anything additional - no glue or solder or anything else.
#14
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RE: pull-pull rudder set-up
ORIGINAL: triumphman49
Assuming the rudder horn connections to be on the hinge line, would the best set up be equi distance between cables at servo and rudder?
T-man49
Assuming the rudder horn connections to be on the hinge line, would the best set up be equi distance between cables at servo and rudder?
T-man49
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RE: pull-pull rudder set-up
Just to throw a curve at ya try servo wheels on servo and in the rudder they have 2 grooves been doing this for years no binding or over centering.try it you mite like it.just a thaught.
#16
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RE: pull-pull rudder set-up
Hey Rodney
Thanx for the response and explanation. Yours I could picturre and understand .
DaDragon, Yours, I couldn't get the picture. Do know how to use servo wheels to set up differential, as for ailerons. Mabey a diagram ? ? ? or another try at explanation ? ?
Many Thanx
T-man49 in Al
Thanx for the response and explanation. Yours I could picturre and understand .
DaDragon, Yours, I couldn't get the picture. Do know how to use servo wheels to set up differential, as for ailerons. Mabey a diagram ? ? ? or another try at explanation ? ?
Many Thanx
T-man49 in Al