CTE

[george kennie]

I hear ya, I hear ya, but I'm still scared.
G.

Wayne Galligan wrote:

>  Georgie I had kevlar pull/pull on my Prophecy for over two years with
> no incidence at all.  Don't be afraid....  kevlar is good!   Its so
> easy to use and if you every did need a field repair it is so easy to
> re rig.   Tie it off and a drop of c/a on the knot and go flying
> again. Wayne
>
>      ----- Original Message -----
>      From: george kennie
>      To: discussion at nsrca.org
>      Sent: Tuesday, November 25, 2003 11:57 AM
>      Subject: Re: CTE
>       Sorry to disagree here, but it would appear that the
>      conclusion being drawn by the respondants is that the
>      pushrod expansion and contraction is the major cause of the
>      problem. Not so, in my experience! Going to pull-pull
>      cables, whether they be steel or kevlar thread will not get
>      rid of the elevator trim change under consideration here.The
>      coefficient of thermal expansion between the cables, which
>      is very small, and the balsa in the fuse, which is
>      significantly greater(glass too) will generate a
>      differential of sufficient magnitude that the "devil" will
>      still attack you when you least expect it.
>      The best solution that I have observed is to put the servos
>      in the stabs. Short of this, I have been using servos
>      mounted just at the L.E. of the stab and using a very short
>      pushrod(approx. 6"). My current thinking is that I will
>      still mount the servo in the same area and go with
>      cables.Very light and direct. As regards Kevlar, I currently
>      have a pattern practise ship that I do almost all of my
>      flying with that has kevlar on the rudder and it has two
>      years of mucho sequences to it's credit with no apparent
>      wear or abrasions to the thread. At this point in time I
>      have still not acquired the necessary intestinal fortitude
>      to use kevlar on the elevator.
>      Georgie
>
>      Amir Neshati wrote:
>
>     > Pull-pull will eliminate the trim change... Amir
>     >
>     >      ----- Original Message -----
>     >      From: Nat Penton
>     >      To: discussion at nsrca.org
>     >      Sent: Monday, November 24, 2003 7:24 PM
>     >      Subject: CTE
>     >       Gray what is the CTI for balsa ? I have carbon
>     >      push rods / balsa fuse and my elev trim moves
>     >      around considerably. I suppose it is because of
>     >      humidity variation between the shop and outdoors
>     >      ?? The pushrods are 50" long.      NatPenton
>     >
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