[NSRCA-discussion] Trim changes

[Dean Pappas]

Jay and Stu win the prize, a week in Philadelphia. 2nd prize two ... 
This was used by some back in the reed days, because there was no trim lever, except for the extra servo and mixer bellcrank that would add a dollop of down trim for inverted flight, and the same amount of up maybe for slowing to a spin or landing. Guys would land and argue with themselves about maybe putting 1/2 turn adjustment into a clevis, then they'd land afterward and undo it.  I was a little kid as I watched this, but thinkin back to it, the convenience of an easy to adjust fine trim is a wonderful thing!
Dean
	-----Original Message----- 
	From: nsrca-discussion-bounces at lists.nsrca.org on behalf of Jay Marshall 
	Sent: Wed 12/6/2006 6:30 PM 
	To: randy10926 at comtekmail.com; 'NSRCA Mailing List' 
	Cc: 
	Subject: Re: [NSRCA-discussion] Trim changes
	
	
	A both rods expand they null out each other. Neat!
	 
	-----Original Message-----
	From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Glenn Hatfield
	Sent: Wednesday, December 06, 2006 5:26 PM
	To: nsrca-discussion at lists.nsrca.org
	Subject: Re: [NSRCA-discussion] Trim changes
	 
	never even heard of the bellcrank trick.  What is it?
	
	Randy
	
	--- lightfoot at sc.rr.com wrote:
	
	From: "Jay Marshall" <lightfoot at sc.rr.com>
	To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
	Subject: Re: [NSRCA-discussion] Trim changes
	Date: Wed, 6 Dec 2006 16:30:35 -0500
	I like it! KISS
	 
	-----Original Message-----
	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 2:25 PM
	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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