REFLECTOR: Ailerons

[Brett Ferrell]

David,


I think what you're seeing is typical, and I think it's probably fine to
fly it.  I think you probably wouldn't have issues doing your flutter
testing as it is, but that's the one area you might want to wait to do
until you swap out for steel, but there's a lot of testing you can do
before you do the flutter speed testing (while you order the steel tubes).
Net, if your next flight doesn't show the 'snatch' tendency, then I suspect
you have a typical Velocity installation now.  If it still snatches, then I
would wait for the steel to proceed testing.


Brett


	-------Original Message-------
  From: David Ullman
  To: reflector at tvbf.org
  Subject: Re: REFLECTOR: Ailerons
  Sent: 26 Dec '11 13:07

  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
  [LINK: compose.php?to=david at davidullman.com] david at davidullman.com
  541-754-3609

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