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Building Tips and technical articles. => Building techniques => Topic started by: Bob Zambelli on December 04, 2007, 06:36:37 AM
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Inspired by the discussion on crimping and swaging, I thought some of you might find this interesting.
I came up with it a few years ago and it's simple, neat and reliable. y1 y1
It eliminates separate line clips - just connect your flying lines directly to the leadouts. #^
As Einstein stated: "All things should be as simple as possible but no simpler!!"
Bob Z.
ps - I described this in the premier issue of CL World.
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When I was a LOT younger, we all (five or six guys) used 1/32 or .045 M.W. for leadouts, mostly .29 and .35 size profiles. The leadouts were attached to the bellcrank arms (bushed pivot, aluminum bellcrank) with a bend almost exactly as your pic----actually, each leadout had a very similiar termination on both ends.
Never a failure, but a little prone to bending.
Jim
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The big advantage of these is since they are spliced into braided leadouts, they cannot bend or kink.
The really work well.
I also use them in take-apart airplanes where the wings split in the middle.
Bob Z.
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Even simpler, (providing you can afford it) - Invest in enough clips to leave in the eyelets of your conventional leadouts ::)
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Yeah but mine just LOOK cool!!!!! ;) ;)
Bob z.
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Bob, I like the concept, but you are totally dependent on the quality of your swaging. Both wires are a "slip fit" held in place by the ferrule.
How about if you had the hard wire bent end outside the ferrule, and the cable wire loops once around it? Then the structure of the ferrule is under compression and a safety feature if anything has a tendency to slip.
Another possibility is to have the cable loop through the bend in the hard wire inside the ferrule so that they bear directly on each other.
I love redundant safety!
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Larry - OF COURSE I depend on the swaging - just like I do on ALL my leadouts.
The end of the music wire section has a small bend that prohibits it from sliding out of the ferrule.
The cable - three passes - is intimately captured by the swaged copper tubing.
The test specimens in my article yielded at around 65 LBf. But, the yield was not catastrophic - the clip end of the music wire just distorted but it held.
I would not hesitate to use this system in any size plane.
Bob Z.
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Looks neat. I was wondering about the diameter of the music wire? Do you have to anneal it first in order to bend it that sharply?
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Hi, David - I found that annealing was not necessary but you must definitely use round-nosed pliers. Here is the write-up I did. It was for a .35 sized ship but I would use it on larger - maybe .46 sized also.
"1) Get some .030 music wire and bend it as shown in the 1st photo. All bends must be with round nose pliers – NO SHARP BENDS!
2) Slide the straight end through a ¾” long piece of annealed copper tubing – NOT BRASS! It helps to flare out the ends to make insertion easier.
3) Now, slide your leadout cable in as shown in the 2nd photo, then back out and finally back in for a total of three passes.
4) Bend the end of the music wire as shown in the 3rd photo.
5) Push the bent over end of the music wire back into the tubing as shown, then gently pull out the long end, till it appears as in the 4th photo.
6) Swage the tubing as shown as shown in the 4th and 5th photos."
I hope this helps.
Bob Z.
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Thanks Bob!
Dave
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Inspired by the discussion on crimping and swaging, I thought some of you might find this interesting.
I came up with it a few years ago and it's simple, neat and reliable. y1 y1
It eliminates separate line clips - just connect your flying lines directly to the leadouts. #^
As Einstein stated: "All things should be as simple as possible but no simpler!!"
Bob Z.
ps - I described this in the premier issue of CL World.
Roy DeCamera has been doing that for years.
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Ian, to your post #3...
I think present AMA rules state that no more than TWO line clips per line are allowable.
Yes, I know, when I was also much younger, we played with additional clips to try to set neutral where our hand preferred. If I recall AMA "guidelines" correctly, that is no longer our option...
To Bob Z:
As others have mentioned, that type of leadout connection was fairly common, way back then, but, as also mentioned, when we used solid wire - .032 or so - for leadouts.
NOT knocking. If the idea of wedding flexible leadout cables with solid wire snap-clips like yours had occurred to people back then, we'd probably see many more such today.
Some of the International community use something similar, according to posts I've seen in other-nation boards. They work.
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Bob: I really enjoyed reading your article on leadouts in CLW. The whole CLW issue was also great (like the previous ones).
Dave