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Old 08-13-2018, 01:34 PM
rmartingt's Avatar
rmartingt rmartingt is offline
 
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Location: Savannah, GA
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Question Cowl exit heat shield... when to rivet?

As of five minutes ago all of the riveting is finished and my fuselage is about ready to flip over. Before I flip this canoe, is there any reason I shouldn't go ahead and install the belly heat shield (as discussed in DanH's many firewall protection threads)? I have a 2x2 sheet of .008 stainless drilled up and I'm starting the prep work for installing it already.

I can't see anything it would interfere with so long as I don't rivet the line where the cowling hinge will attach. Anyone see something I'm missing?
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Old 08-13-2018, 01:54 PM
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Raymo Raymo is offline
 
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Like you said, jut the cowl hinge fitting. I purchased some for mine but haven't gotten around to installing it.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter, PlanePower Alt
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
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Old 08-13-2018, 02:10 PM
David Paule David Paule is offline
 
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That's the stage where I did mine on my RV-3B.

Since .008 isn't appropriate for a primary firewall, I decided that I'd use .020 titanium. I used 1/16" Fiberfrax under it as insulation. I used F.A.R. Part 23.1191 to learn what a firewall should be made of, and then got the cheapest titanium I could for that.

Now since this isn't considered a firewall, I suppose I could have used something thinner, such as your .008 stainless. I'm not criticizing your choice, just explaining mine. But there have been one or two reports of fires that melted the aluminum there, and on the RV-3B the pilot's feet rest directly on that belly skin, so I wanted something I had confidence in.

Dave
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Old 08-13-2018, 02:26 PM
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rmartingt rmartingt is offline
 
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Yes, forgot to mention that it'll be backed by 1/16 ceramic fiber insulation.
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Old 08-13-2018, 02:44 PM
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jcarne jcarne is offline
 
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I just flipped my canoe and riveted my titanium 0.020 everywhere except for the cowl hinge line.
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Old 08-15-2018, 11:51 AM
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rmartingt rmartingt is offline
 
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Looks like a consensus then!

I'll proceed with priming underneath and then I'll install it except for the cowl hinge line. I plan to seal the edges with proseal (to prevent moisture/oil intrusion and for corrosion protection) since it'll be on the outside.

On the firewall I'll be using the DanH method and I'll be welding up my own firewall passthroughs, as an excuse to use my welder and they're non-structural
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RV-7ER - canoe flipped
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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Old 08-15-2018, 02:03 PM
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Raymo Raymo is offline
 
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I suggest sealing with 3M Fire Barrier 2000.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter, PlanePower Alt
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
NSDQ

"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army
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Old 08-16-2018, 04:52 AM
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rmartingt rmartingt is offline
 
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Quote:
Originally Posted by Raymo View Post
I suggest sealing with 3M Fire Barrier 2000.
I thought about it but was concerned about oil resistance and weatherproofness(?). However, some further research says it looks like it's actually pretty good for that sort of thing. I'll need another tube when I do the firewall blanket but it's not too bad ordered off of amazon.
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