REFLECTOR: Aileron Mounting Screws

[Brett Ferrell]

  I asked this question of the factory a long time ago and was told that
countersunk would be fine as long as I used tinnerman washers to spread the
clamping load out and keep the screw from digging in.  Their thinking may
have changed since then, and the washer make a much larger visual   impact,
but I didn't want the pan sticking up, and I switched to torx head screws
to keep from chewing up the Phillip's ones.


Brett


	-------Original Message-------
  From: Brian Michalk
  To: Velocity Aircraft Owners and Builders list
  Subject: REFLECTOR: Aileron Mounting Screws
  Sent: 08 Nov '11 12:38

  The manual calls for using AN526 non-structural screws to mount the
  ailerons to the wing.
  I personally don't like these softer screws because the Phillips head
  always seems to get a little messed up.  I like the structural ones a
  lot better, but I was wondering if it would be okay to use a countersunk
  structural screw?

  What are the pull out forces in fiberglass for these two types of screw
  heads?

  I have a lot of filler on my wings where the screws attach.  I used to
  use the pan head screws clamping down on this filler, so I dremelled out
  the filler to the glass, and floxed the remaining depression for a very
  hard surface that will handle the compression.  It seems to me that I
  have almost 1/4" of fiberglass/flox for the screw to fasten to, and
  using a countersunk screw here seems reasonable.

  Any thoughts on this?  As long as there's no flutter, there shouldn't be
  that much longitudinal force on these screws.
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