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Old 06-03-2017, 08:56 AM
Lindyshambaugh Lindyshambaugh is offline
Join Date: May 2012
Location: Ocala, FL
Posts: 7

I would appreciate your ideas regarding firewall and exhaust pipe tunnel insulation.
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Old 06-03-2017, 09:06 AM
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Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,023

Dan Horton has done extensive work with various materials and locations for insulating the firewall....Cliff note version is to use Fiberfrax on engine side, cover with stainless steel foil.

Lots of good info to be found by searching archives.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 06-03-2017, 12:01 PM
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DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 7,532

Lindy, click "search" above, select "advanced search", and when you get to the advanced search page, use the keywords "firewall insulation", put "DanH" in the user name space, and select "posts" at the bottom. You find a few spirited threads, 2008 to current. And if you want to skip the reading, just do it like this.

Dan Horton
Barrett IO-390
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Old 06-03-2017, 05:30 PM
mturnerb mturnerb is offline
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 577

For Dan Horton:

What specific SS rivets do you suggest?
Turner Billingsley
RV-14A In Progress
N14TK Reserved
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Old 06-03-2017, 08:38 PM
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johnbright johnbright is offline
Join Date: Aug 2010
Location: Newport News, Va
Posts: 171
Default Belly Photo

Dan Horton: "And if you want to skip the reading, just do it like this."


Sorry, I don't understand the belly photo. Exhaust heats the belly/floorboard?
John Bright, RV-6A 25088, at FWF
O-360, 8.5:1, vert sump, SDSEFI EM-5
Z-14 adapted for EFI, wiring and IP CAD files here
Newport News, Va
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Old 06-03-2017, 08:51 PM
Chkaharyer99 Chkaharyer99 is offline
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 787

No. Fire melts the belly and floor. Its a fire barrier as I understand it. What you're looking at IIRC is fiberfrax sandwiched between two layers of light weight stainless steel foil. The sealed assembly is riveted to the belly and firewall and serves to buy the pilot time should an in flight engine fire occur.

Last edited by Chkaharyer99 : 06-03-2017 at 08:55 PM.
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Old 06-03-2017, 09:26 PM
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DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 7,532

That's an RV-10. They tend to have a problem with a hot tunnel. Just like the firewall, insulating the hot side is far more effective than any insulation inside the structure. And in the event of an engine compartment fire, it will nicely shield the belly.

I have no specific advice for an RV-12 tunnel, having never looked closely at one, but the basic principle applies anywhere.
Dan Horton
Barrett IO-390
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Old 06-04-2017, 07:01 AM
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Weasel Weasel is offline
Join Date: Dec 2012
Location: Brooksville, MS
Posts: 686

Originally Posted by johnbright View Post

Sorry, I don't understand the belly photo. Exhaust heats the belly/floorboard?
That photo happens to be the bottom of our airplane. A little history data.

Prior to adding this external insulation the airplane was operated for more than 600hrs. In flight measurement of the air temperature inside the tunnel was 145 deg. F after 2+hrs of cross country flight with 65deg oat.

The exhaust is probably not the issue.

Think of the continuous flow of 200 deg air flowing out of the cowl exit and attaching itself to the belly of The airplane. Now consider the belly being thermally connected to the tunnel, and associated interior. Also noted was how quite a lot of heat was being rejected into the cockpit.

After installing this on the belly and firewall, the tunnel internal air temperature is 110 deg. F. At the same conditions and less heat felt coming into the cockpit.
RV-4 715hr Sold
RV-10 "School Bus" - +1400hr counting
Fisher Classic Cassler Power VW sold
RV-8 700+hrs
Carbon Cub 180 hr
One-Off Super Cub 90 hr
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Old 06-06-2017, 02:58 PM
Tmartin66 Tmartin66 is offline
Join Date: Jun 2016
Location: Washington,Oklahoma
Posts: 25
Default Firewall Insulation

Has anybody tried the fire protective paint that Aircraft Extras (Vans Airforce Advertiser) has on their link. This type of product has been used successfully in certain types of building construction in regards to prolonged structural integrity in fire situations. If it reacts as advertised, it would be much simpler. Just a thought.
T. Martin
RV-14A under construction
N114TM reserved
Dues paid 2018
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