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06-03-2017, 08:56 AM
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Join Date: May 2012
Location: Ocala, FL
Posts: 8
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FIREWALL INSULATION
I would appreciate your ideas regarding firewall and exhaust pipe tunnel insulation.
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06-03-2017, 09:06 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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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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06-03-2017, 12:01 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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__________________
Dan Horton
RV-8 SS
Barrett IO-390
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06-03-2017, 05:30 PM
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Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,474
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For Dan Horton:
What specific SS rivets do you suggest?
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06-03-2017, 08:38 PM
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Join Date: Aug 2010
Location: Newport News, Va
Posts: 325
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Belly Photo
Dan Horton: "And if you want to skip the reading, just do it like this."
 [/quote]
Sorry, I don't understand the belly photo. Exhaust heats the belly/floorboard?
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06-03-2017, 08:51 PM
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Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 845
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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.
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Charlie
RV-8
Last edited by Chkaharyer99 : 06-03-2017 at 08:55 PM.
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06-03-2017, 09:26 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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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.
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Dan Horton
RV-8 SS
Barrett IO-390
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06-04-2017, 07:01 AM
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Join Date: Dec 2012
Location: Brooksville, MS
Posts: 745
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Quote:
Originally Posted by johnbright
Sorry, I don't understand the belly photo. Exhaust heats the belly/floorboard?
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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.
__________________
Weasel
RV-4 715hr Sold 
RV-10 "School Bus" -   +1600hr counting
Fisher Classic Cassler Power VW sold
RV-10 N7631T 820hr Sold
RV-8 700+hrs
Carbon Cub 200 hr Sold
One-Off Super Cub 100 hr
SERFI AWARDS
http://weaselrv10.blogspot.com/
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06-06-2017, 02:58 PM
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Join Date: Jun 2016
Location: Washington,Oklahoma
Posts: 50
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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.
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T. Martin
RV-14A under construction
N114TM reserved
Dues paid 2020
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