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  #11  
Old 01-07-2019, 11:37 AM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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I made the big cuts first...holes for engine controls, fuel/brake lines, wires, and mounting of the oil cooler. Throttle/prop/mixture cables come thru one hole like many certified birds.

Big holes have flanges I turned out of 304 stainless bar on the lathe, which firesleeve clamps to. Used stainless screws and steel stop nuts to mount those. Insulation is sandwiched in-between the firewall and these flanges.

My Comanche is 57 years old and had the same type of material on the firewall. I learned from it to make everything removable so the insulation can be replaced.
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.

Last edited by rocketbob : 01-07-2019 at 11:46 AM.
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  #12  
Old 01-07-2019, 02:30 PM
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Checkmate Checkmate is offline
 
Join Date: Dec 2014
Location: Western Michigan
Posts: 35
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I used .005 SS Shim Stock, 1/8" FiberFrax, 3M Barrier 2000+. No wrinkled tinfoil look like the thinner stuff but some oil canning is to be expected around the areas where you attach items over it. Also a hydraulic punch works great for making nice clean round holes. Ordered everything from McMaster-Carr.

https://lh3.googleusercontent.com/0G...c=w800-h450-no

https://lh3.googleusercontent.com/VH...I=w450-h800-no

https://lh3.googleusercontent.com/YT...=w1608-h904-no

https://lh3.googleusercontent.com/99...l=w800-h450-no[/quote]
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RV-9A - Down for Panel & Engine Conversion
1946 Piper J-3 Cub - Flying
VAF Donation Paid Feb. 2020

Last edited by Checkmate : 01-07-2019 at 02:38 PM.
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