[NSRCA-discussion] Trim changes

[Dean Pappas]

Hi Nat,
So you've had the pull-pull tension change blues too!
So have I, though I do like the system.
 
By the way, Keith ... setting up pull-pulls gets easy if, and only if, you carefully set the elevator horns so that all four clevis pins are dead in line with the center of the hingeline. If they are behind it (typical) then life is miserable.
 
regards,
Dean
	-----Original Message----- 
	From: nsrca-discussion-bounces at lists.nsrca.org on behalf of Nat Penton 
	Sent: Wed 12/6/2006 11:27 PM 
	To: NSRCA Mailing List 
	Cc: 
	Subject: Re: [NSRCA-discussion] Trim changes
	
	
	Amir
	All that fine weather is bad for relations !
	 
	I use Kevlar pull-pull on rudder, balsa fuse, and with high humidity I am worried the servo will be uprooted. Need to adjust atleast daily. Also use DEP on elev ( 20 years ) and have trim changes sometimes hourly. I need to change both.            Nat
		----- Original Message ----- 
		From: Amir Neshati <mailto:amirneshati at earthlink.net>  
		To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>  
		Sent: Wednesday, December 06, 2006 2:21 PM
		Subject: Re: [NSRCA-discussion] Trim changes

		I thought it went like, "wood fuse, pull-pull, fiberglass fuse, pull-pull, carbon fuse, pull-pull." Lightest set up too.
		 
		65 degrees, sunny, calm, clear & comfortable....
		 
		Amir

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		From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dean Pappas
		Sent: Wednesday, December 06, 2006 11:25 AM
		To: NSRCA Mailing List
		Subject: Re: [NSRCA-discussion] Trim changes
		
		
		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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