[NSRCA-discussion] Pull-pull setups

[J N Hiller]

John, I can’t comment on Kevlar. I have only used steel (.021” Sig control
line cable). I also use internal bell cranks to eliminate cable tension load
on the servo mount rubber grommets and shaft. This way I can run the cables
quite snug. Short ball link connectors connect the bell cranks to the servo.
By using different holes in the servo wheel or bell crank I can use the full
servo travel, and reduce the control surface travel without resorting to
non-parallel linkage or transmitter endpoint and accompanying resolution
reduction.
I haven’t been totally happy using dual elevator servos so I cable them as
well, connecting all 4 cables to a single bell crank. It is quite easy to
balance the travel, center and end-points by adjusting the threaded control
horn and cable length. When I started doing this it yielded the tightest
system I ever used.
For what it is worth.
Jim Hiller

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of John Pavlick
Sent: Wednesday, January 23, 2008 4:38 PM
To: NSRCA Discussion
Subject: [NSRCA-discussion] Pull-pull setups

I'd like to hear the pros and cons of Kevlar vs. steel pull-pull cables.
Also any tips on installing either of them. I've done a few steel setups but
I haven't installed a Kevlar one yet. how long does Kevlar last?

John Pavlick
http://www.idseng.com
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