REFLECTOR: Holes in the Spar

[nmflyer1 at aol.com]

I wasn't comfortable putting holes in the spar either. The only exception I made was the center attach bolts for the motor mount. (Those have a bushing glassed into the firewall/sheer web so that it does not crush). 


The silver thing hanging across the spar straddles the spar. On the front side is my ignition stuff, on the aft side is the power pack for the strobes & such. 


Moves the weight forward while keeping all that stuff out of the engine bay & cooler. 


Pic Here:


http://tinypic.com/r/nxm9z9/7










Kurt





-----Original Message-----
From: Jack Prock <jackprock at wavecable.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Thu, Mar 10, 2011 10:39 am
Subject: REFLECTOR: Holes in the Spar


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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