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  #21  
Old 07-09-2017, 02:37 PM
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mike newall mike newall is offline
 
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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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  #22  
Old 07-09-2017, 03:20 PM
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rongawer rongawer is offline
 
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Location: Brentwood, CA
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Default 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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- RV-12 N975G, SN 120840, Build in progress...finally on the finishing kit, so, something like 90% done and 90% left to go.
- 1975 B58 Baron, N1975G (a bottomless money pit that makes building an RV look like lunch money, but it's a great airplane, hauls the family and my wife likes two engines...go figure)
- 1961 A33 Debonair, N433JC (R.I.P.)
- RV7A; didn't finish it and donated to kid's club
- Zenith CH601XL; flying somewhere in Louisiana https://youtu.be/wa_Y_A_rP_8

Last edited by rongawer : 07-09-2017 at 03:24 PM.
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  #23  
Old 07-09-2017, 07:31 PM
E. D. Eliot E. D. Eliot is offline
 
Join Date: Dec 2005
Location: San Pedro
Posts: 822
Default 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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  #24  
Old 07-09-2017, 08:24 PM
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rongawer rongawer is offline
 
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Hey, that's very innovative. I like it.
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Ron Gawer

- RV-12 N975G, SN 120840, Build in progress...finally on the finishing kit, so, something like 90% done and 90% left to go.
- 1975 B58 Baron, N1975G (a bottomless money pit that makes building an RV look like lunch money, but it's a great airplane, hauls the family and my wife likes two engines...go figure)
- 1961 A33 Debonair, N433JC (R.I.P.)
- RV7A; didn't finish it and donated to kid's club
- Zenith CH601XL; flying somewhere in Louisiana https://youtu.be/wa_Y_A_rP_8
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  #25  
Old 07-09-2017, 09:40 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by rongawer View Post
Sealing the rivets is not really about protecting you from a fire, but CO getting through while idling on the ramp or in flight.
Nope
That has nothing to do with why the plans specify sealing the rivets.


Quote:
Originally Posted by rongawer View Post
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.
This is the only reason......
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  #26  
Old 07-12-2017, 03:39 PM
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mike newall mike newall is offline
 
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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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  #27  
Old 07-12-2017, 06:57 PM
daveyator daveyator is offline
 
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Location: adelaide, south australia
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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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  #28  
Old 07-12-2017, 08:03 PM
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Nedimbek Nedimbek is offline
 
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Location: Calgary, Alberta
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Quote:
Originally Posted by mike newall View Post
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.
Page 29A-06 Step 4.
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  #29  
Old 07-13-2017, 06:25 AM
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mike newall mike newall is offline
 
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Aaaahhhhhhh
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