REFLECTOR: Ailerons

[Scott Derrick]

I've got Aluminum torque tubes on a STD.  600+ hours and nary a problem 
with aileron control.

Scott

-------- Original Message --------
Subject: Re: REFLECTOR: Ailerons
From: David Ullman <ullman at robustdecisions.com>
To: reflector at tvbf.org
Date: 12/26/2011 11:07 AM

> I am still struggling with the ailerons.  Scott has spent much time on the
> phone with me and I appreciate this factory support.  I have torn out the
> push pull cables and rerouted them making the angle to the control horns
> near 90deg and relaxing radius of the cable bend.  I have virtually no slop
> in the system .  The trim system still cant move them and there is still
> more friction than I would like on the stick.  It is much, much less than
> when I started and a flight test will tell if this is good enough(my test
> pilot is on vacation).  Any other ideas are appreciated or comments on
> aileron stiffness.
>
> One problem came out that I haven't fixed is that I have aluminum torque
> tubes on the ailerons.  These came with the kit.  The factory now uses
> steel.  I calculated the difference in stiffness between a .035 steel and
> the .06 aluminum tube and it is a factor of 2.0  Statically, I don't think
> that a pilot could feel the difference in the resulting stiffness.  But, my
> test pilot is worried about flutter.  He has experienced this twice in Reno
> racer development and both had aluminum torque tubes. Should I swap these
> out before it flies again., or can it wait until I take the plane apart for
> painting in a year?
>
> Happy new year to all and I may get to fly in 2012 (I said that last year
> also).
>
> David Ullman
> N-444DX Velocity
> EAA 292 President
> david at davidullman.com
> 541-754-3609
>
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