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Building Tips and technical articles. => Building techniques => Topic started by: john e. holliday on July 12, 2010, 11:46:08 AM
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Here is how I used to do leadouts and I am doing it on the plane I am working on now just for grins.
Pic one getting every thing together to start.
Pic two The 1/16 tubing has cable slid thru it and inserted into bellcrank, it is bent after inserting into the bellcrank hole. The front leadout has cable inserted thru the tubing. The tubing has been passed thru a torch to red hot condition and then let cool to room temp.
Pic three has copper wire laid along the cable and start wrapping at the bellcrank.
Pic four after putting 20 wraps I fold excess copper wire that was said along cable back over the wraps.
Pic five another 20 wraps and the leadout cable access is laid back over the wraps.
Pic six wrap out another 15-20 wraps and start wrapping back over the existing wraps toward the bellcrank. I use smooth jawed needle nose to bend the cable down along the wraps. When I get to the bellcrank I take the loose end and do a figure 8 wrap thru the opening of the cable/tubing. Twist the copper wires together and clip off access. Depending on how much cable you left for the fold back it needs to be cut so it doesn't go out into the opening of the leadout tubing.
Pic seven is the results after repeating procedure for the other leadout. When all is in the wing/airplane the leadout ends for the clips is basically the same. I use a 1/8th drill bit to bend the tubing around after inserting the cable. Wrap the same way. Hope this isn't too confusing. Now you know why I never took up teaching. H^^
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Doc -that is pretty much how I do mine also - except I use a longer piece of 1/16th tube and bend it around my knife handle, once wrapping is complete - I soak it in either epoxy of thin CA then put heat shrink over the wraps to stop any fraying.....
I use the same technique on my lines - then if they are slightly out - you can jus squeeze the short one until it is hte same length as the other one -
I might take a pic tonight if I remember
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Allen Brickhaus recommended something like this in his recent "Fairey Barracuda" article in FM. I tried it (with appropriate modifications to work with a Sig bellcrank) and it worked nice.
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I do not reccommend using epoxy or CA as that makes for a very stiff connection. I have used the shrink tubing on a cable handle to hold the clips in place so they don't fold back on the cable. H^^
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I do not reccommend using epoxy or CA as that makes for a very stiff connection.
How do you secure the wire, then?
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I never built with cable leadouts. Jack Sheeks taught me to use solids and I never had a problem. Yes, they can get bent if you jam the end of the wing into something, but I was always careful and never bent one. The free ends were bent into an elongated diamond shape to accept the line clips.
My adjustable leadouts consisted of a row of 1/8" holes drilled along the length of the tip block and then connected with a saw cut. Each leadout had a brass headed bushing that was a snug fit in the holes. Each leadout could be adjusted independently of the other. If a hole ever loosened up, it could be re-sized with a few coats of clear dope.
That being said, I will use cables in subsequent models when I resume building, since that is what everyone else is using with success.
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HI Dick,
I,too, use the eyelets in wing tip holes for adjustable lead outs a lot. A tiny bit of paper towel will work in a pinch of you're at a contest and the eyelet doesn't fit snug. ;D
Big Bear
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I do not reccommend using epoxy or CA as that makes for a very stiff connection. I have used the shrink tubing on a cable handle to hold the clips in place so they don't fold back on the cable. H^^
hmmmm- 3 layers of (usually) 21thou or larger leadout wire over a distance of 1 1/2 - 2 " wrapped with copper wire is pretty stiff anyways...........the glue just binds the wire to the leadout.......if you extend the heat shrink past the wrap by 1' or so is abosorbs a little of the issues that may cause a kink.......
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I use a horseshoe end bellcrank, flexible leadouts that are pretty much wrapped the same way at each end (the eyelet fits into the horseshoe) and a captured leadout slider with independently adjustable leadouts (I'll never build another plane without them).
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I use a horseshoe end bellcrank, flexible leadouts that are pretty much wrapped the same way at each end (the eyelet fits into the horseshoe) and a captured leadout slider with independently adjustable leadouts (I'll never build another plane without them).
Hi Randy,
I wonder why Billy has them so close?
Bill
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How do you secure the wire, then?
Pic six comments I guess are vague. I put/pull the loose end of the wrapping thru the opening between the wrap and the tubing/ It is like threading a needle. I go backand forth thru the opening and around the cable. Easier to show than tell about. Then I twist the two ends together. Hope you haven't cut the other end of the copper wire. Once they are twisted together, cut off the excess. H^^