REFLECTOR: Holes in the Spar

[Alex Balic]

I had a similar problem with clearance in the lower corners of the sump tank
( Subaru mount) , so I ended up modifying the sump to provide clearance for
the bolts- not a lot of fun, but it worked out fine.

 

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From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Kathy Cook
Sent: Thursday, March 10, 2011 5:24 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Holes in the Spar

 

Jack, do not put holes in the spar...even  better if you limit the holes in
the engine bulk head to as few as possible.  With your foamfilled bulkhead ,
probably the best solution, other than a hole, is to glue/laminate the bolts
that you need for attaching things in the engine compartment with structual
adhesive to the bulkhead.  certainly it wouldn't be a good idea, in my
opinion, to have the bolt heads on the inside of the firewall bulk head
where they could touch the sump tank.  However, you might have enough space
to move the sump tank forward a little and clear the bolt head and clear the
gear legs.questions call me

 

 

 

 


 

 

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From: Jack Prock <jackprock at wavecable.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Thu, March 10, 2011 9:39:06 AM
Subject: REFLECTOR: Holes in the Spar

Hi,ee

 

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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