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The other thing here is there should be NO way for any rod end bearing on that push tube to come off if more than half the threads on each rod end bearing are engaged. |
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Also make sure that the jam nuts are tight before you drop the pushrods in. Not so much with the big rod but with the smaller one that goes forward, it's a giant pain in the neck to get a wrench in there to do it once it's been installed.
I know this is a "duh" advisory, but it's surprising how many times DARs and others find these particular jam nuts loose. |
ROd ends
It should almost be impossible for any pushrod on a Vans aircraft to unscrew it's self since all the rod ends are threaded like a normal bolt and not like a turnbuckle. You can not turn the pushrod and have both rod ends loosen up.
Smilin' Jack Ever wonder if you've been building too long... and now might have an answer :) |
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Since both rod ends are threaded as you describe, if they are both loose and rotating, the push/pull rod would be threading further onto one while it is threading further off the other. The way RV push/pull rods are designed, they should always bottom out onto the jamb nut of the one threading further in, before they fully unscrew off the rod end that is threading out. |
Never say Never!
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My post was in response to the comment that it wasn't possible because of the way the rod ends thread, but in reality, if the push/pull rod is of incorrect length, with the wrong amount of thread engagement of the rod ends, it is possible for the tube to thread to one end and separate from the rod end at the other end. |
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There's a reason why in dealing with rod end bearings -- of any kind -- the wisdom has always been make sure AT LEAST half the threads are engaged at both ends. That's the only foolproof guarantee, and it's just good building practice. That's not to say other methods don't include a margin of safety. |
Interference
So the large and small pushrods are of the correct length, bellcranck verticle, etc... Problem is,the stick hits the instrument panel when full forward!! Not good...what to do?? Shorten sticks, extend elevator stop, or ??? Anyone else have this issue?
Jim |
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