echristley(at)att.net
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 Posted: Sun Dec 20, 2020 10:35 am Post subject: Has anyone used very high temp silicone FWF? |
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On Saturday, December 19, 2020, 7:05:03 PM EST, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:
A mock firewall sheet is fitted with the proposed feed
thru system. A propane fired burner is positioned a
few feet off the front side of the firewall. A thermocouple
is positioned about 6" off the firewall right in front
of the test article.
The test setup is bathed in propane powered flame
sufficient to push the thermocouple reading to 2000
plus or minus a hundred or so degrees . . . for
ten minutes.
With all due respect, why doesn't the test require that the test article also support the weight of firewall forward components while the test is being conducted? For a firewall that is held together and to the airplane with either rivets that melt at around 950F (but are mechanically useless above 500F), and epoxy that will melt above 300F (at best), all that test shows is that your wire bundle will be safe as the pieces of your airplane crash to the ground in different spots. Maybe the hope is that the caulk can hold the airplane together.
I understand safety margins, and a desire to get the best protection available. But as with everything else, there comes a point when the search for safety crosses over to being useless, then comical, or may even reach counter productive. I wonder if Mr. Thurman has run the test on a firewall connected to fuselage and engine to see how long they stay together. The front half of a fuselage that is already heading to the recycle plant would be all that's necessary.
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