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larry(at)macsmachine.com
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 Posted: Wed Nov 26, 2008 7:26 am Post subject: [Probable Spam] Re: Spreading fear about the XL |
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Hi Ron,
I completely understood, but many might think these cables have stretch,
where in fact, the cable weight is what's at play here. The concerns for
flutter are
based on the cable weight becoming harmonic and somehow combining to
start a bigger vibration. If this were the case, it would be better to
put guides
at a couple of places along the cable length to support the cable and
then the harmonics of low tension cables would not be possible.
Larry McFarland 601HDS at www.macsmachine.com
Ron Lendon wrote:
| Quote: |
Larry,
It was never my intention to intimate using the airframe to stretch the cables like guitar strings. I will fixture something on my work table when I get to that point. The cables will be pre-stretched before assembly.
Hope that clarifies things,
--------
Ron Lendon, Clinton Township, MI
WW Corvair with Roy's Garage 5th bearing
Zodiac XL, ScrapBuilder 
http://www.mykitlog.com/rlendon
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jaybannist(at)cs.com
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| Posted: Thu Nov 27, 2008 2:32 pm Post subject: [Probable Spam] Re: Spreading fear about the XL |
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Gig,
F.Y.I. - The breaking strength of 1/8" 7x19 galvanized aircraft cable is 2,000 pounds. We are putting a max of 40 pounds on it. It doesn't sound like we are overstressing it much, with a safety factor of 50, now does it? I'm guessing that the weak link is the nicopress sleeves WE install. If any testing is to be done, it probably should be on a made up cable with both ends complete.
Jay in Dallas
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Jeyoung65(at)aol.com
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| Posted: Fri Nov 28, 2008 8:23 am Post subject: [Probable Spam] Re: Spreading fear about the XL |
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Jay, I think your remark "We are putting a max of 40 pounds on it." could be misleading. The max force the control cables will see depends on the force the pilot puts on the joy stick. The force on the control surfaces at max deflection times the mechanical advantage for the system would normally be the max cable force but when the controls have a stop then the pilot becomes the limiting force, again you have to use the system mechanical advantage. Jerry of GA Do not archive
In a message dated 11/27/2008 5:33:05 P.M. Eastern Standard Time, jaybannist(at)cs.com writes:
[quote] Gig,
F.Y.I. - The breaking strength of 1/8" 7x19 galvanized aircraft cable is 2,000 pounds. We are putting a max of 40 pounds on it. It doesn't sound like we are overstressing it much, with a safety factor of 50, now does it? I'm guessing that the weak link is the nicopress sleeves WE install. If any testing is to be done, it probably should be on a made up cable with both ends complete.
Jay in Dallas
Do not archive
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jaybannist(at)cs.com
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| Posted: Fri Nov 28, 2008 8:58 am Post subject: [Probable Spam] Re: Spreading fear about the XL |
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Maybe I am misleading. OK, say we put 80 pounds on it. A safety factor of 25. Or if you are up to it, 100 pounds. Still a safety factor of 20. Most engineering applications work with a safety factor of 2 or 3. My point was (and still is) that we are not anywhere close to challenging the strength of the cable. It is the terminations we should be concerned about.
Jay in Dallas
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notsew_evets(at)frontiern
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| Posted: Fri Nov 28, 2008 10:16 am Post subject: [Probable Spam] Re: Spreading fear about the XL |
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Lernt many eons ago to always install two squeezons on cable.
SW
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