[NSRCA-discussion] Trim changes

Fri Dec 8 06:03:35 AKST 2006

Hi Nat,
I'm using the Sullivann composite tube-in-tube pushrods in a wooden fuselage model right now. The expansion coefficients are far from mtched, though it is rather predictable. If it's colder than last time I flew, I will need up trim and vice versa. The trim change is a factor of 2 or 3 worse than if I had a fiberglass/carbon pushrod in the plane, but tons better than an old Nyrod, and tons cheaper than carbon fiber rods. My serious airplanes still get carbon rod DEPs.
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 Ed Alt
Sent: Friday, December 08, 2006 1:12 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Trim changes

Nat:

It starts on this page: http://www.rcuniverse.com/forum/m_3637235/mpage_4/key_prestige/tm.htm <http://www.rcuniverse.com/forum/m_3637235/mpage_4/key_prestige/tmhtm> 

Yes, it's the Sullivan composite version for the inner pushrod.  Actually, the Prestige is nearly all wood.  It's a balsa composite shell with thin FG layer on the inside, pressed into balsa and then coated with whatever they create the finish with.

Ed

----- Original Message ----- 
From: Nat Penton <mailto:natpenton at centurytel.net>  
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  
Sent: Thursday, December 07, 2006 9:36 PM
Subject: Re: [NSRCA-discussion] Trim changes

Ed
I'm having trouble finding the Prestige thread. Can you help me out ?? Are you using the Sullivan composite inner pushrod ? Would they be of any benefit in a wood fuse ?                 Nat
----- Original Message ----- 
From: Ed  <mailto:ed_alt at hotmail.com> Alt 
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  
Sent: Wednesday, December 06, 2006 10:53 PM
Subject: Re: [NSRCA-discussion] Trim changes

You might want to check out the Prestige thread under Pattern on RCU.  I adopted a pushrod method that Dave Lockhart has used for some time and there are some pics and description there.  I think Dave's installation method is more highly evolved than what I patched together, but I think what's shown in the thread is a reasonable facsimili.  When you first hear about using Nyrods, you will most likely be very skeptical.  I sure was.  These are different though, since they have the CF slider vs. the usual junk.  There is some change with temperature, but not nearly as much as I have experienced with other methods.  It's really light, really cheap and not too difficult to install.  It's also a very positive control feel.

Ed
----- Original Message ----- 
From: Nat Penton <mailto:natpenton at centurytel.net>  
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  
Sent: Wednesday, December 06, 2006 11:27 PM
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  <mailto:nsrca-discussion at lists.nsrca.org> List' 
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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