REFLECTOR: Ailerons

Jim Agnew jim_agnew_2 at yahoo.com
Mon Dec 26 18:40:11 CST 2011


I can explain exactly what is wrong with the aluminum tubes.  They do not rotate around the center line of the ailerons.  The tubes warp absorbing the torque.  Proven by several Torsional vibration specialists at my request.  I replaced all of the aluminum torque tubes with the same size and thickness stainless steel tubes and added universal joints to the aileron connection to minimize the warping tendency.
 
When Sam DaSilva & I discovered that you could hold the back edge of the aileron with your thumb & forefinger and move the stick FULL THROW RIGHT & LEFT without the aileron moving that made me look for the problem.
 
Jim

James F. Agnew
Jim_Agnew_2 at Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed & Flying

From: Alex Balic <velocity_pilot at verizon.net>
>To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org> 
>Sent: Monday, December 26, 2011 7:19 PM
>Subject: Re: REFLECTOR: Ailerons
>
>I have the aluminum torque tubes as well, I was going to investigate filling
>them with rigid (high density) pour foam to see how much it might help
>stiffness- would want to experiment on some tubing first of course.... as
>for the aileron trim- I am not sure that it will actually move the ailerons,
>just provides a bias on the system.
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>Behalf Of David Ullman
>Sent: Monday, December 26, 2011 12:08 PM
>To: reflector at tvbf.org
>Subject: Re: REFLECTOR: Ailerons
>
>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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