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ideaz1(at)sbcglobal.net
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 Posted: Tue Nov 18, 2008 4:44 pm Post subject: Fairleads |
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Just had another thought as I am studying my plans and the aileron and
rudder cables are shown going through fairleads and changing directions. I
was under the impression that you should always use a pulley to change the
direction of a cable, and that a fairlead was just to stop vibration or the
cable striking parts it shouldn't. Even just a minor direction change in a
cable under tension running through a 1/8" thick piece of nylon is going to
cut into it and release the tension as it does, and may be contributing to
the tensioning issues being discussed.
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ihab.awad(at)gmail.com
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| Posted: Tue Nov 18, 2008 4:58 pm Post subject: Fairleads |
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On Tue, Nov 18, 2008 at 4:44 PM, Dirk Zahtilla <ideaz1(at)sbcglobal.net> wrote:
| Quote: | Even just a minor direction change in a cable under tension running through a
1/8" thick piece of nylon is going to cut into it and release the tension as it
does, and may be contributing to the tensioning issues being discussed.
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This one is relatively easy to test given the right materials. It
should be easy to construct a geometrically correct model of one of
the setups by screwing some stuff to some 2x4s or whatever, tension it
to 30 pounds, move the cable back and forth a few times, and then
recheck the tension and examine the fairlead. Any Zenith builder might
already have (or have access to) excess cable and maybe even pulleys,
and fairlead material.
Ihab
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Ihab A.B. Awad, Palo Alto, CA
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Tue Nov 18, 2008 7:03 pm Post subject: Fairleads |
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My airplane has over 250 hours on it and there is no sign of wear on
the fairleads. That fairlead material is tough stuff. Fairleads are OK
for small changes of direction of a few degrees. A large change of
direction does require a pulley.
On Nov 18, 2008, at 7:44 PM, Dirk Zahtilla wrote:
| Quote: |
>
Just had another thought as I am studying my plans and the aileron
and rudder cables are shown going through fairleads and changing
directions. I was under the impression that you should always use a
pulley to change the direction of a cable, and that a fairlead was
just to stop vibration or the cable striking parts it shouldn't.
Even just a minor direction change in a cable under tension running
through a 1/8" thick piece of nylon is going to cut into it and
release the tension as it does, and may be contributing to the
tensioning issues being discussed.
|
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith-List |
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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