[NSRCA-discussion] Control surface/linkage setup

[Tim Taylor]

The issue is aftermarket servo arms don't have the offest built in, so servo trim is required. 
Stock arms do and are strong enough to use and get to 90 without using subtrim.

Tim
--- On Wed, 11/10/10, Lightfoot <lightfoot at sc.rr.com> wrote:


From: Lightfoot <lightfoot at sc.rr.com>
Subject: Re: [NSRCA-discussion] Control surface/linkage setup
To: "'General pattern discussion'" <nsrca-discussion at lists.nsrca.org>
Date: Wednesday, November 10, 2010, 8:42 PM






The strength of the servo arms is not the issue. If the arm is not at 90 degrees at neutral then the math says that it will differ in response in the +/- directions. Usually this is not an issue.
 
Jay Marshall 

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Tim Taylor
Sent: Wednesday, November 10, 2010 8:22 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Control surface/linkage setup
 





Given Earl's testing results of servo arm sheer strength, I don't think you need anything more than the stock arms.

 

Tim

--- On Wed, 11/10/10, Michael Cohen <precisionaero at hotmail.com> wrote:


From: Michael Cohen <precisionaero at hotmail.com>
Subject: [NSRCA-discussion] Control surface/linkage setup
To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
Date: Wednesday, November 10, 2010, 8:12 PM

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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