Firewall section complete!

Hours Worked = 3

Today, I was able to finish the firewall section of the plans!

I started by completing the riveting of the tunnel rib sub assemblies, then proceeded to rivet the sub assemblies to the firewall. This is a very strong point of the airplane, as there are 70 4- rivets fastened to each of the two brackets that join the tunnel to the firewall!

I was able to get all the firewall rivets with the extended back rivet set and the mushroom back rivet bucking bar pretty easily.

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Finally, I closed things up by installing the heat boxes. These are little flapper valved that can be opened and closed to control the amount of heat that warms the cabin. This is also where I depart the stock plans, as I chose to install stainless steel heater boxes instead of the stock aluminum ones. I did this for fire safety as I wrote about in an earlier post. I also made some gaskets out of some silicon material to thermally insulate the heater boxes from the firewall. Some RV10’s have had issues with the tunnel getting warm, and this is one of the things that people have suggested to help against that.

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Also for fire safety, I also passed on using proseal for sealing up some various holes in the firewall like the plans call for. Instead, I used 3M Fire Barrier 2000+, which unlike ProSeal, is actually designed to stand up to extreme temperatures and help prevent fire from invading the cabin in the event of an engine fire.

2 thoughts on “Firewall section complete!

  • March 19, 2013 at 2:22 PM

    I thought airframes had a Keel similar to a boat. Like a backbone everything else is mounted/bolted/welded to. This is looking more like a unibody or monocoque frame where everything is bolted to one another and structural integrity comes from the sum of all of the sub assemblies?…not sure what I’m attempting to say other than I don’t see a definitive “frame”…I see “modular” pieces?

  • March 19, 2013 at 3:39 PM

    Some airplanes do have a frame that provides the “backbone” strength. For example, a Piper Cub has a steel tubing skeleton that everything attaches too, and then is covered with fabric.

    Most modern aluminum planes, like the RV10 are a “monocoque” construction, where the strength comes mostly from the skin itself.

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