CTE

[Rcmaster199 at aol.com]

In a message dated 11/25/2003 11:47:15 PM Eastern Standard Time, 
tkeithb at comcast.net writes:


> Subj:Re: CTE 
> Date:11/25/2003 11:47:15 PM Eastern Standard Time
> From:<A HREF="mailto:tkeithb at comcast.net">tkeithb at comcast.net</A>
> Reply-to:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> To:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> Sent from the Internet 
> 
> 
> 
> Matt,
>  
> The negative CTE of Kevlar seems as though it would exaggerate the loosening 
> and tightening of the cables. As the fuse shrinks the cables will lengthen 
> and visa versa. 
>  
> How would this be better than metal cables?
>  
> Keith Black
> 

A case of too much info Keith. Some may have led you to believe that there is 
a great deal of expansion/contraction. In reality the amount of movement is 
too small to notice.About 1/32" is allthe movement that technically results 
from extreme temp swings.

 With Kevlar the CTE is negative, which means things get a little tight in 
the summer and a little loose in the winter, but if you did the installation 
correctly and applied the minimal tension required in the cables, it's a 
non-issue. The cables should be set-up with very little tension, and will easily 
absorb the movement. Be very fussy about having servo output arms on center of the 
rudder horn plane and elevator horn plane; also most imprtant is to have the 
clevises on the hinge line or very slightly aft for best results. Avoid being 
forward of the hinge line

I don't change the tightness of my set-ups Winter to summer and back again. 
My planes are in trim better than push rods have been in the past, by a wide 
margin. Also, my set-ups have the cables, both sides, in slight tension all the 
time, in true pull-pull fashion. 

Guys get in trouble when they aren't really fussy during set-up and then 
blame the type of system they use. Have you seen how my Alliance just locks in 
pitch? It makes things very easy

matt
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