[NSRCA-discussion] Elevator trim change

[Rcmaster199 at aol.com]

I meant CTE. 

Matt

In a message dated 5/9/2006 8:38:38 PM Eastern Standard Time, 
natpenton at centurytel.net writes:
I think the "settling in" is due to the coating. I never experienced this 
with the bare unidirectional kevlar.


----- Original Message ----- 
From: rcmaster199 at aol.com 
To: nsrca-discussion at lists.nsrca.org 
Sent: Tuesday, May 09, 2006 5:40 PM
Subject: Re: [NSRCA-discussion] Elevator trim change


Nat, et al, 

Kevlar actually has a negative COE, which, in theory at least, means it 
expands as it gets cooler. I saw a little of that in the stuff I used to make (the 
teflon coated type). Georgie is right that it took a couple weeks of settling 
in before adjustments held well over time. The negative COE still showed up 
when temps dropped, however, in a pull-pull set-up, it generally means nothing.

As far as very low COE of carbon tow, yup that's correct. Carbon in a plastic 
matrix isn't quite as clear. Fiberglass in a plastic matrix has similar 
issues. It's the delta between the two material types that important. In my 
experience they move enough to require a click of trim change as temp varies, fairly 
normal this time of year in the NE. 

Matt
 
-----Original Message-----
From: Nat Penton <natpenton at centurytel.net>
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
Sent: Tue, 9 May 2006 13:08:26 -0500
Subject: Re: [NSRCA-discussion] Elevator trim change


George I agree with your comments with one exception. The Sullivan controll 
line kevlar is the best of all worlds for our hookups. There is no stretch, no 
weight, no electromagnetic problems. It is unidirectional with, probably, a 
low COE like carbon.
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