[NSRCA-discussion] Control surface/linkage setup

[J N Hiller]

Be careful selecting servo arms. A believe there are 3 different spline
drives in use. When selecting aftermarket arms get the ones specifically
intended for the servo brand you are using such as 'JR' or 'Futaba'. Someone
did a really nice write-up on this some months back but I don't remember
where I dead it.
Jim Hiller

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Michael Cohen
Sent: Wednesday, November 10, 2010 5:12 PM
To: NSRCA
Subject: [NSRCA-discussion] Control surface/linkage setup

I have a question for the list about control surface/linkage setup.  I
remember a K-factor article which mentioned making the servo arm is as close
to a perfect 90 degrees as possible at neutral.  This is what the little
1-2-3-4 on the stock plastic servo arms are for.  You simply rotate the arm
until 90 degrees is achieved.  However, with aftermarket heavy duty plastic
or metal arms, is there any other solution other than sub-trim?  I am
concerned about the “stock” arms deflection under load and like to use the
aftermarket products, but on some servos on my airplane, this leads to a lot
of sub-trim, which is also not preferable.  Thoughts?

Mike Cohen
D4
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