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Dale, I saved his web page as an html document - no longer have the link.
Just save the attachment and keep it for ref in lieu of getting it from the
web site. I added another attachment - an e-mail that discusses 4 types of
firewall penetrations and assessment of protection.
If the attachment doesn't make it thru the FlyRotary e-mail server, here's
the link: http://www.aeroelectric.com/articles.html and scroll down past the
updates to Aeroelectric Connection to "How To Articles" and click the 2nd
item, ". . . simple firewall penetrations for wires"
I. Also, here's text from 2 Mar 2003 Q&A re the sealant around the wires in
that "system": --> AeroElectric-List message posted by: "Robert L.
Nuckolls, III" <bob.nuckolls@cox.net>
At 07:37 PM 3/1/2003 -0600, you wrote:
--> AeroElectric-List message posted by: "David Carter"
<dcarter@datarecall.net>
Bob,
Excellent pictures. What is the white "sheet" of material wrapped around
the wires in the engine compartment (coming out of the stainless steel
firewall fitting)? Is it "white fire sleeve" or something else?
That is silicon rubber covered, fiberglas sleeving . . .
similar to the stuff we sell in our fusible link kits.
This is not a necessary component of the fire-stopping
abilities of technique described.
Fire stop putty might have a tendancy to "migrate" out from under the
clamp?
Don't know why it would . . .
So, strips of fire sleeve material, as you showed, would be firmer and tend
to stay in place better - could put a small amount of fire putty inside
in/amongst the wires, under the wire sleeve "packing band". Do I have the
correct idea here?
The putty has been used for a very long time in this an similar
applications. I don't think I'd diddle with the technique without
substantive testing or analysis as to what benefits it might
offer.
Bob . . ." [ end of 1st e-mail quote ]
II. Dale, here's a 2nd Q&A, re sealing the stainless steel flange as it
fits flush to the firewall: --> AeroElectric-List message posted by:
"Robert L. Nuckolls, III" <bob.nuckolls@cox.net> 13 Mar 03:
"At 11:17 AM 3/13/2003 -0800, you wrote:
--> AeroElectric-List message posted by: Julia <wings97302@yahoo.com>
What's the best thing to use for sealant on the flanges which make up my
firewall wire penetration - i'm using SS tubing welded to a flange - so
what would go between the flange and the firewall - to make it
airtight? I"m not talking about around the wires - but just between the
flange and firewall? how about proseal - would that be ok -or should it
be some kind of fireproof silicone - I think someone mentinoed that
once, I cannot seem to find anything in aircraft spruce - can anyone
point me in the right direction for of where I might get the correct
product here?
The installation I posted uses a fire-stop compound. Any
stuff you can find at a builder's supply would probably
be okay here. It's a thin, ideally zero-thickness interface
and about any fire-resistant material is going to be hard
to displace. I suspect silicone sealant would work okay
there too.
Bob . . ."
[ end of 2nd e-mail quote ]
III. Dale, here's text of a 3rd :"info" e-mail some "fire protection
assessment" and good test data on "badness" of aluminum fittings in presence
of fire "melts like wax in 10 seconds": " AeroElectric-List message 25 Feb
03 posted by: czechsix@juno.com
"Guys, I saw this on Doug Reeves' website this morning and thought I'd post
it here for those of you who aren't RV builders and probably didn't see it.
Since the topic of how to protect wire bundles through the firewall while
maintaining the integrity of the firewall has been discussed here before I
thought it was relevant. You can see the text and pictures at:
http://members6.clubphoto.com/doug412210/1161024/guest.phtml
Here's the text for the archives:
Firewall Penetrations
Firewall Penetrations-by Vern Darley (vern@mindspring.com)
Years ago,I was an Air Force Force pilot and had a jet engine throw a
compressor blade thru the
cockpit and hit the side of the ejection seat. The cockpit immediately
filled with intense heat
and I was solid IFR with dense white smoke inside the cockpit. In another
type of AF plane,I
once experienced an electrical fire in the cockpit. In college,I worked
parting out crashed
light aircraft at an FBO. Lately,I've wandered around aircraft junkyards
scrounging parts. All
of these experiences have made me accutely aware of how much I want to keep
fire out of my RV
cockpit.
In the RV world,there are four main penetrations through our firewalls:
engine controls,fuel
lines, wiring, and cabin heat/air. Due to their small size and the
availability of
'eyeballs',etc. engine controls are not a big threat to us. The fuel line
penetration is
normally handled by a through-the-firewall fitting. So, there remain two
main threats to our
health and safety: the wiring bundles and the cabin heat/air.
Typically, most builders seem to opt for the rubber grommet and a dab of RTV
for the wires,and
depend on the aluminum cabin heat devices that Vans and others market to
cover the
two-inch-or-so firewall penetration for air. In my opinion, the aluminum
devices are inadequate
protection to keep fire on the engine side of my RV. In searching for
solutions, I found a new
company that has helped me solve these problems. I asked them for data,and
Paul Bowmar, director
of R&D provided me with a video of a recent test he conducted on aluminum
vs.stainless firewall
penetration devices. His company,EPM.AV Corporation, has developed a
beautiful stainless version
of the airbox most RVs need and has also manufactured various size wiring
pass throughs.He has
also tested various compounds that seal the wire bundles.
In the tests, a standard aluminum RV style vent was subjected to a flame
source at the 1600-1800
degree range that one would get in a fuel fire in a flying RV. The aluminum
vent melted like wax
within ten seconds! Even with a stainless flapper installed, this would not
have protected us
since the flapper would simply fall away when the supporting aluminum
structure melted. Tests on
an all stainless version of the same airbox endured extended direct flames
with no damage for
the duration of the test. Tests with wire penetrations yielded similar
results and pointed out
the need to use top grade wire and insulation for your through-the-firewall
wiring. I've since
bought actual products and am happy to report first class workmanship and to
recommend their new
products to my fellow RV'ers.
Fly safe!
Vern Darley
6A slowbuild
Peachtree City, Ga"
[ end of 3rd quoted e-mail ]
- - - - - - - - - - - - - - - - -
end of David's reply to Dale's original (next item below), to which this
e-mail replies:
----- Original Message ----- From: "Dale Rogers" <rogersda@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, July 13, 2004 9:41 AM
Subject: [FlyRotary] Re: Coil Harness (was: LS1 Coil Connector)
---------- Original message:
> From: "David Carter" <dcarter@datarecall.net>
> Date: 2004/07/12 Mon PM 10:59:19 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Coil Harness (was: LS1 Coil Connector)
>
> Dale, have you seen Bob Nuckoll's "towel bar" firewall fitting item on
his
> web page? Very safe way to make firewall penetrations for your std
wires.
> There's a commercial source for same that is reasonable (in the $50+
range
> vs $20-30 for roll-your-own parts)
>
> David
David,
Is this a B&C Specialties Item? If so, it's very well
camouflaged. It's going to take a while to search through
Bob's site; do you - perchance - have a link to the page?
Dale
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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