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-   -   Fiberfrax? (https://vansairforce.net/community/showthread.php?t=172132)

rocketman1988 06-04-2019 07:05 PM

Fiberfrax?
 
Thinking of using Fiberfrax on cowling near exhaust pipes.

Has anyone used this material and if so, what thickness is recommended 1/16" or 1/8"?

WingsOnWheels 06-04-2019 07:18 PM

Quote:

Originally Posted by rocketman1988 (Post 1350957)
Thinking of using Fiberfrax on cowling near exhaust pipes.

Has anyone used this material and if so, what thickness is recommended 1/16" or 1/8"?

It is pretty common. fiberfax with a layer of adhesive foil over it, edges of the foil sealed with RTV. 1/16 is enough, but 1/8 wont hurt.

49clipper 06-04-2019 07:57 PM

49clipper
 
I am thinking of adding 1/8" to my firewall on a new build. It says 2000f temp. anyone used it in lieu of some of the other stuff tested by Dan H.? I don't recall him testing fiberfax.
Jim RV-6
dues paid

tgmillso 06-04-2019 08:38 PM

Some good info in this thread:

http://www.vansairforce.com/communit...d.php?t=131516

I used morgan superwool HT. Pretty similar, but biosoluble if you breath the dust in when cutting. Bit more delicate, but got the job done.

My process is described in page 7 of the above thread.

http://www.vansairforce.com/communit...=131516&page=7

Tom.
RV-7

Mike S 06-04-2019 08:40 PM

Quote:

Originally Posted by 49clipper (Post 1350967)
I am thinking of adding 1/8" to my firewall on a new build. It says 2000f temp. anyone used it in lieu of some of the other stuff tested by Dan H.? I don't recall him testing fiberfax.
Jim RV-6
dues paid

Pretty sure Fiberfrax is what Dan is using on his plane------and has recommended in a few threads on this subject.

BillL 06-05-2019 06:48 AM

Quote:

Originally Posted by rocketman1988 (Post 1350957)
Thinking of using Fiberfrax on cowling near exhaust pipes.

Has anyone used this material and if so, what thickness is recommended 1/16" or 1/8"?

I used 1/16" for one pipe 1/2" away from the glass. It seems to work well, but don't have any temperature data. 1/16" is plenty for most, but just double for specific protection. I sprayed adhesive on the back to keep it from blistering, not sure if that was needed. Then covered the top with adhesive backed aluminum foil from Vans.

maniago 06-05-2019 09:06 AM

I put 1/16" Fiberfrax on the firewall covered with stainless steel foil, seamed with Al tape; and the same 1/16" on my exhaust tunnel covered with .012 Titanium sheet seemed with Firebarrier 2000. I believe Dans test showed it does its job but does outgas when flamed, hence his recommendation was only on the engine side......thickness would be your call. I dont know any property differences.

Bavafa 06-05-2019 09:30 AM

Quote:

Originally Posted by maniago (Post 1351051)
I put 1/16" Fiberfrax on the firewall covered with stainless steel foil, seamed with Al tape; and the same 1/16" on my exhaust tunnel covered with .012 Titanium sheet seemed with Firebarrier 2000. I believe Dans test showed it does its job but does outgas when flamed, hence his recommendation was only on the engine side......thickness would be your call. I dont know any property differences.

I have all the above as well as my entire lower cowl covered by fiberfrax which is covered by aluminum foil (for the lower cowl). Right after shut down, the upper cowl (cool side) might be really hot to touch but the lower cowl is barely warm. The effectiveness of it is simply amazing. I had this my old plane which based on great experience, I added to the new plane.
I used 1/8" for the firewall and inside the tunnel and 1/16" for the cowl.

DanH 06-05-2019 09:54 AM

Strips of fiberfrax to shadow the pipes, under the HD self-stick foil sold by Vans. If the interior of the cowl is finish painted, the foil sticks without any other glue.


bruceh 06-05-2019 12:35 PM

I have the 1/16" Fiberfrax on my cowling. I ended up adding more after the first year of flying. You can see the discoloration from the heat.

Before:


After:


If I had it to do over again, I would have put a lot more down there in the initial application during the build. It has held up well and the paint on the exterior is still looking great.


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