[NSRCA-discussion] Trim changes

[Dean Pappas]

Hi All,
Back in the Stone Age (Ron remembers this) we always said, "wood fuse, wood pushrod and fiberglass fuse, fiberglass pushrod.
As long as the elevator trim is the only one that changes, then life is simple especially with crossed digital trims.
Putting the servos in the tail works, as does an MS-10 or Matchbox.
So does putting a 1:1 bellcrank halfway between the servo arm and the elevator horn. That's a trick that nobody uses anymore.
 
Dean
 
Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Jay Marshall
Sent: Wednesday, December 06, 2006 2:06 PM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Trim changes


Some servo electronics could be temp sensitive. Measure the elevator on a cold morning then warm it up slowly with a heat gun (carefully) and see if anything moves.
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Brian Billings
Sent: Wednesday, December 06, 2006 12:05 PM
To: nsrca-discussion at lists.nsrca.org
Subject: [NSRCA-discussion] Trim changes
 
I have been dealing with elevator trim changes on my D.E.P.S. installation which has been worse with cold mornings and warm afternoons. Last night on the way home from the field I got the idea of figuring out a way to take the pot out of the servo and mounting it on the control surface, that way the surface will always go to it's set position regardless of how much the fuse has expanded or contracted. Anybody ever try this, I know it could be done but is it practical? My worry is vibration, sealing the pot from the elements, oil, keeping a clean signal with the long leads to the rear and a positive connection from pot to surface. Is this a dumb Idea?
 
Brian  
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