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Firewall Foil Advice
Planning to use Dan H's information to install Fiberfrax on firewall. Seemed really straightforward until ordering supplies on ACS. They don't seem to sell stainless foil in 24" width??? After trying to find an answer on vendors, found MANY options listed on forum and now I'm stuck in analysis paralysis. Need some questions answered to get "unstuck".
1. Thicknesses listed is from .002"-.010". If I want minimum "wrinkling" and a smoother finish, is thicker better?Thanks in advance for help! |
Ditto.
Randy, glad you asked....just getting into this now. Looking forward to responses. |
I purchased the 970J 1/8" x 24" Fiberfrax
and also Ordered McCaster Carr 3254K92 for the foil. That is .002" x 24" My plan is to have 2 sections cover my firewall with some overlap. Either a vertical overlap down the middle or horizontal overlap. I also ordered some SS pop rivets to secure the overlap area to the firewall. As you can probably tell, I have yet to install this, but is what I've seen a couple of others do, so that's what I went with. |
An easier potion
https://www.koolmat.com/heat-resista...ts-protection/
Order: #04248 ZERO CLEARANCE / PSA Install on the fwd side of the firewall. Does a great job of keeping heat off your feet, and there is some noise attenuation. Touching the cowling IMMEDIATELY after shutting down - the cowl is at ambient temp around the exh pipe areas. Works more or less the same as the Fiberfrax/SS sheet, but this stuff is cut, peel, and stick. Best to add some of their aluminum duct tape too - both products are the stickiest things I have run across - except Gorilla Tape. The Zero Clearance sheet is about $80 -have a very sharp pair of scissors to cut the stuff. I have not tried the silicon sheet they recommend for aviation. I could not come up with a glue to hold it on. PM me if you want a picture of an installation. |
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I used this stuff on my Rocket. No overlap required.
https://www.amazon.com/gp/product/B0...UEKDZ4IY&psc=1 To Dan's point I took a sample and had a propane torch on it for about 5 minutes to no effect. Other than the foil disintegrating, the fiberglass stayed perfectly intact. |
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Melt point of fiberglass fabric is fairly high (2100F ballpark, IIRC), but the rate of heat transfer will go up dramatically when the aluminum foil cover sheet melts away at about 1100F. The cover foil is both reflector and hot gas barrier. |
Penetrations
Hey guys, dummy question here. Do you put this on before you make penetrations and install items, or afterward?
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And how do you handle the penetrations?
Put a spacer under them? Let them squeeze the Fiberfrax? Or something else? Dave |
I'm using .005 titanium foil from Titanium Goat, an outdoor equipment vendor. It comes in up to 16" widths, and if you need their 20" wide foil, that's .008 inches thick.
It's not hard to work but compared to the thin stainless, there's a weight penalty. Since I've never worked with the thin stainless foil I can't offer a direct comparison. Dave |
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