REFLECTOR: Holes in the Spar

[Brett Ferrell]

Jack,


I'm not sure what the "official" answer is.  I would expect it's probably
OK to put a hole in the shear web, but I chose not to out of an abundance
of caution.  I attached hardpoints to the spar with structural adhesive,
and attached everything to those hardpoints.

Brett


	-------Original Message-------
  From: Jack Prock
  To: Velocity Aircraft Owners and Builders list
  Subject: REFLECTOR: Holes in the Spar
  Sent: 10 Mar '11 12:39


Hi,

With the pictures of the ELT installation going   around, some of the
pictures
show stuff attached to the inside of the main spar.   Are you using screws

or bolts that go into or through the spar? I   thought that was a no-no.

With that in mind, I am starting on the engine   installation and want to
drill
holes through the firewall for attaching the oil   cooler, etc. I am
working around
the spar and XL sump tank, and there doesn't seem   to be a lot of real
estate to
attach things.

What is the concensus? is it ok to put a few holes   in the spar?

Is it ok to put bolts in the firewall   behind the sump tank? with bolt
heads against
the sump tank? I would remove the sump tank drill   the hole, put
the bolt in, then replace the sump tank. But this   would place the
bolt head flush against the back of the sump, and I   forsee long term
vibration rubbing a hole in the tank.

Am I being overly cautious?

Jack
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