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  #1  
Old 01-02-2019, 09:54 PM
JDA_BTR JDA_BTR is offline
 
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Location: Baton Rouge, LA
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Default Firewall Passthrough

I can't find any material in my firewall forward kit to complete my firewall passthroughs. I thought there would be a couple of flat pieces; one to wrap and put into the tube of the passthrough; and a second to wrap over the top of the tube of the passthrough and the first inner layer.

What on the Vans site or ACS is the right material to use for this? How much is needed? Was also going to use the 3M firewall sealant 2000 (3000?) to pot it.
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  #2  
Old 01-02-2019, 09:59 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default pass through

http://www.cleavelandtool.com/STAINL.../#.XC2IdS2ZPLY
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  #3  
Old 01-02-2019, 11:13 PM
rv7charlie rv7charlie is offline
 
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Default

Or the same thing from Amazon or the local building supply for $10, plus some firesleeve & hose clamps.
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  #4  
Old 01-03-2019, 02:30 AM
scsmith scsmith is offline
 
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Location: Ashland, OR
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Default

I really like these:

https://www.aircraftspruce.com/catal...clickkey=32868
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  #5  
Old 01-03-2019, 05:39 AM
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ronschreck ronschreck is offline
 
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Location: Gold Hill Airpark (NC25), NC
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Default +1

Quote:
Originally Posted by scsmith View Post

Agree. Those work great and when it comes time to replace the worn cables they come apart easily. When I first built my RV I used these:



They were easy to use and looked great. But, when it came time to replace some control cables I found that the finely threaded aluminum parts had galled and they were impossible to dis-assemble without ruining the parts. Don't know why I bought them in the first place as they are 100% aluminum and likely to be the first part of the firewall to burn through in an emergency.
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  #6  
Old 01-03-2019, 06:00 AM
bobnoffs bobnoffs is offline
 
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Location: n. wi
Posts: 555
Default

what rv7charlie said.elect. dept at any hdwe has connectors to fit a junction box which are perfect for a pass thru.
I had a couple in my last airplane's firewall.someone commented they are a pot metal, not stainless. it was a wooden, cloth covered Dakota hawk, give me abreak!
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  #7  
Old 01-03-2019, 06:45 AM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Be careful

Some conduit flanges are galvanized metal. Galvanized metals give off toxic fumes when exposed to high temperatures...
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+
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  #8  
Old 01-03-2019, 07:33 AM
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ronschreck ronschreck is offline
 
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Quote:
Originally Posted by rocketman1988 View Post
Some conduit flanges are galvanized metal. Galvanized metals give off toxic fumes when exposed to high temperatures...
My engine is on fire, fueled by burning avgas, synthetic rubber hoses,oil, plastic insulation, fiberglass, epoxy, paint and a dozen other substances. Am I going to worry about fumes from a galvanized conduit flange? Seriously! But I do appreciate your comment and concern.
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Last edited by ronschreck : 01-03-2019 at 07:35 AM. Reason: had to add to the list...
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  #9  
Old 01-03-2019, 07:50 AM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Missing the point

Having been around galvanized EMT in high heat situations, I can say that you donít need a fire for the fumes to occur. Whether or not that temperature can be reached before a fire starts remains to be seen but I can tell you those fumes are dense and noxious. I would never use galvanized EMT on my aircraft, YMMV.

On the other hand, guys are making pass thoughts from SS sheet and thin wall SS tube very inexpensively. Just cut, drill, and weld. Or, mcmaster sells really nice SS flanges, which I used. I did put the flange on the lathe and removed some of the material to make it lighter, though...
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+
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  #10  
Old 01-03-2019, 08:12 AM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
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Default

1. I never said to use galvanized electrical flanges. But I suspect that they are better than a split aluminum ball, as was just listed. Bigger danger is grabbing one of the 'pot metal' items, which have a much lower melting point.

2. https://www.ebay.com/sch/i.html?_fro...lange&_sacat=0
or
https://www.ebay.com/sch/i.html?_fro...ld+Neck+Flange
if you need two.

3. You guys do know that it's legal to use galvanized steel for the entire firewall, right? And there are hundreds (probably thousands) of classic homebuilts flying with galvanized firewalls? Not saying it's the best solution, but we don't fly turbines, either. ;-)

Charlie

edit: Here's the how-to, on the Aeroelectric site. Note that some of the pics are of FAA-certified factory a/c.
http://www.aeroelectric.com/articles.../firewall.html

Last edited by rv7charlie : 01-03-2019 at 08:21 AM.
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