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07-09-2017, 02:37 PM
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Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
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Stainless steel.....
Epoxy cowl and Perspex screen.
It is a bit like Alien v Predator, I know which one would win.
Building 2 12's, not sealing anything. There is a solid mandrel in all the pop rivets. Not much chance of anything getting through, especially with a well sorted Rotax.
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"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2020
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07-09-2017, 03:20 PM
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Join Date: Dec 2007
Location: Brentwood, CA
Posts: 659
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Avgas; it's not just for breakfast anymore
Sealing the rivets is not really about protecting you from a fire, but CO getting through while idling on the ramp or in flight. Case in point, the rivets are aluminum and the cable linkage and wire holes use a rubber grommet (hey, how about a little sealant around that little assembly at the firewall?). That stuff will all melt ASAP if torched with AVGAS, somehow seemingly glossed over - but don't forget your heat shield on your stainless braided teflon fuel hoses!
Even with a well sorted engine, CO and other wonderful scents can get through, mostly after that nice new tight exhaust system starts to get some wear - most evident while idling on the ramp. I blew the $5 worth of sealant and sealed the firewall, between seams when I assembled the skins and firewall together as well as the non-solid rivet heads.
Those mandrels are fairly tight when new, but there's still a little hole in the head that can be a great collector for oil and muck, which is part of the idea behind sealing the little suckers up.
May you never have a fluid leak on your FWF, but if you do, a few extra minutes sealing rivet heads will prevent giving guuck a hiding place.
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Ron Gawer
- RV10, Build in progress.
- RV12, N975G, "The Commuter"...many great hours and happy landings so far.
- Several others that are now just great memories for me.
Last edited by rongawer : 07-09-2017 at 03:24 PM.
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07-09-2017, 07:31 PM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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Another way to do it
I took a 3/8" wooden dowel and cut two pieces from the stick - one piece about 6" long and the other about 12" long. Smooth one end of each stick that you will use.
Place dowel into a vice, etc. facing 'up' - take your hand-held drill motor and chuck up a drill bit about 3/32" or so - drill out the end of dowel to about 1/8" deep. Center the hole. Gradually enlarge the hole into the face of the dowel until you have a concave face on the end of the dowel. This hole should be about 3/16 deep. I finished up grinding out the hole on the end of the dowel by using a round Dremel sanding bit. You are aiming for a inverted moon shape on the end of the dowel.
Fill the end of the dowel with a small amount of whichever rivet covering material that you choose. Place end of 'loaded' dowel over the rivet and twist as you remove the dowel. Easy and pretty fast way to get a good cover and seal of the rivet. Looks pretty good too.
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Building finally
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07-09-2017, 08:24 PM
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Join Date: Dec 2007
Location: Brentwood, CA
Posts: 659
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Hey, that's very innovative. I like it. 
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Ron Gawer
- RV10, Build in progress.
- RV12, N975G, "The Commuter"...many great hours and happy landings so far.
- Several others that are now just great memories for me.
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07-09-2017, 09:40 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by rongawer
Sealing the rivets is not really about protecting you from a fire, but CO getting through while idling on the ramp or in flight.
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Nope
That has nothing to do with why the plans specify sealing the rivets.
Quote:
Originally Posted by rongawer
Those mandrels are fairly tight when new, but there's still a little hole in the head that can be a great collector for oil and muck, which is part of the idea behind sealing the little suckers up.
May you never have a fluid leak on your FWF, but if you do, a few extra minutes sealing rivet heads will prevent giving guuck a hiding place.
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This is the only reason......
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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07-12-2017, 03:39 PM
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Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
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Mmmmmm,
Our plans are 29A and don't show that sealing process. It does mention the tooling holes and the gaps where the firewall flanges are.
Our plans are dated 2014 at that point.
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"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2020
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07-12-2017, 06:57 PM
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Join Date: Jan 2011
Location: adelaide, south australia
Posts: 171
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On the earlier plans it was section 29-05, step 4.
"Cover the head of each rivet on the firewall with a thin layer of fuel tank sealant".
Cheers, DaveH
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07-12-2017, 08:03 PM
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Join Date: Nov 2015
Location: Calgary, Alberta
Posts: 99
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Quote:
Originally Posted by mike newall
Mmmmmm,
Our plans are 29A and don't show that sealing process. It does mention the tooling holes and the gaps where the firewall flanges are.
Our plans are dated 2014 at that point.
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Page 29A-06 Step 4.
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Nedim Bek
Almost time.
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07-13-2017, 06:25 AM
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Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
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Aaaahhhhhhh 
__________________
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2020
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