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How to use turnbuckles?

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How to use turnbuckles?

Old 11-22-2010, 08:58 AM
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Default How to use turnbuckles?


This may seem like a stupid question on a scale forum, but how exactly are turnbuckles used to tension flying wires?

Having used only non-scale clevises so far, I was wondering if the 2 threaded eyelets (and the attached wires) are twisted during adjustments?

Or does the center bit (loop?) have counter-rotating threads with both eyelets staying 'in plane' but going in or out when the latter is twisted?

What is the best method to secure turnbuckles once the desired tension is achieved?

Finally, I was thinking of ordering some nice looking brass turnbuckles from this supplier
http://arch.navalis.pl/

Has anyone used products from them before?
Old 11-22-2010, 09:21 AM
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Default RE: How to use turnbuckles?

A RCU search has returned these threads:

http://search.rcuniverse.com/search....hwhere=subject
Old 11-22-2010, 09:55 AM
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Default RE: How to use turnbuckles?

Trev, the two end pieces (whether eyes or forks) are right and left hand threaded so that rotating the barrel of the turnbuckles pulls them both inward or outward. So to set up your turnbuckles you need to have them at almost their full extension, then make the wires as without slack as possible by hand. Then you can rotate the body to pull the wires to flying tension. After the tension is set you need to use safety wires which wrap around the ends and thread through the middle of the body. Somewhere I have (and have seen on RCU) a diagram showing the proper safety wire technique.
Old 11-22-2010, 10:34 AM
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Default RE: How to use turnbuckles?

Ah, here it is:

Old 11-22-2010, 10:49 AM
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Default RE: How to use turnbuckles?

Trev: Use great caution when tightening turnbuckles!! It is very easy to pull things out of alignment with them.

LEs
Old 11-22-2010, 11:08 AM
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Default RE: How to use turnbuckles?

ORIGINAL: Trev


What is the best method to secure turnbuckles once the desired tension is achieved?

Just finished securing 75 turnbuckles I did it with 0.3mm steel wire.
Old 11-22-2010, 11:42 AM
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Default RE: How to use turnbuckles?

OK. So where's your EIII thread again? I know it's over on RCSB somewhere, but I always have a hard time finding anything there. I suppose it's under Proctor builds, right?

*****

Nevermind! Found it. I do feel like joining the fun over on RCSB, but I'm just so cozy here on the RCU Scale forum.
Old 11-22-2010, 10:40 PM
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Default RE: How to use turnbuckles?

Trev:

As an aircraft mechanic, I deal with turnbarrels all the time and the other guy's are definetly right when it comes to tightening them up. One thing that I would do is leave a little slack in the cable, this can be adjusted before you crimp the swage. A little experimenting will tell you just the right amount. The reason being that these modelling turnbarrels have way fewer threads than a full size one and you need to have some thread engagement inside the barrel. I usually leave about 4 threads showing on the eye or clevis end. Remember to not tighten to much and you'll be just fine.
Old 11-23-2010, 03:10 AM
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Default RE: How to use turnbuckles?

That sounds like dead-on advice. I'll add that on the ground/bench landing wires should be "taut" and the flying wires just a bit slack. In the air or with your fingertips under the wingtips, the flying wires should be taut and the landing wires a bit slack. The question here is the relative meanings of "taut" and "slack." I take "taut" to be tight enough so the wire makes a low "thuwung" sound when plucked. This isn't very tight and it doesn't need to be. You're not tuning a guitar. It just has to be tight enough to hold the wings where they are under flight loads...and a fraction of a bit more dihedral never hurt anybody.
Old 11-23-2010, 07:58 AM
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Default RE: How to use turnbuckles?



Thanks everyone for the helpful comments and advice! Also in particular for the words of caution (Les, destrat), my naive approach would've been to tighten them up like guitar strings!

Teus from what I can see that's a great looking EIII! Proctor right? Is your thread over on RCSB?

Abu, cheers for the safety wire illustrations!
Old 11-23-2010, 10:22 AM
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Default RE: How to use turnbuckles?

ORIGINAL: Trev

Teus from what I can see that's a great looking EIII! Proctor right? Is your thread over on RCSB?
Thats right Trev, you can find it here: [link=http://www.rcscalebuilder.com/forum/forum_posts.asp?TID=15817&PN=1&TPN=1]Fokker E.III a Dutch build[/link]

Teus

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