Brady,
No, I didn't misunderstand her main question.? I just didn't know the answer to
it. (:>)
What I answered was her secondary question about take-up measurements when turning
the turnbuckle.
Jay in Dallas
-----Original Message-----
From: Brady <brady@magnificentmachine.com>
To: zenith-list@matronics.com
Sent: Sun, 30 Nov 2008 10:19 am
Subject: Re: Aircraft Control Cable (to stretch or not)
Jay,
I think you may have misunderstood her question. :)
I looked to me as though she was asking what the adjustments would net in
tension.
For example:
If you started with a cable tensioned to 30lbs then tightened it 4-6/64Th's what
would the tension be? (31lbs?)
My guess is that it would be insignificant.
The aileron spec is 30lbs +/- 5lbs.
I doubt you would see a difference of 1 pound either way.
I could be wrong, it's happened before :)
Sabrina,
there is a formula for that but I haven't found it yet.
Still looking :)
I am sure the tension to turnbuckle lead is not linear.
The cable will continue to stretch until you reach the yield strength and so the
ratio is a "parabolic" curve. (if I'm using that right?)
The Curve will depend on material, diameter and class (construction; IE 6x19,
6x25, 6x32 etc.) of the wire rope.
also the length of the cable will have a lot to do with it.
The stretch is a percentage so a shorter cable will stretch less total distance
than a longer one will.
If you decide to take on that experiment and take it to cable failure, be very
careful!
I have seen cables break before and they store an amazing amount of energy!
--------
Brady McCormick
Poulsbo, WA
www.magnificentmachine.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=217048#217048
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