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-   -   Tunnel Insulation (https://vansairforce.net/community/showthread.php?t=158579)

rleffler 03-12-2018 12:21 PM

Quote:

Originally Posted by az_gila (Post 1245415)
If I read your blog pictures correctly, the 1/16 Fibrerfrax is sandwiched between the two skins (SS and original belly aluminum) by the same rivets that attach the skins to the fuselage ribs.

Wouldn't having this layer of Fiberfrax in the assembly screw up the structural integrity of the skin to rib riveted joint?

I don't know how either Mike or Kyle assembled theirs, but I would not use the rivets in the plans to ensure no compromise to structural integrity. I would off set rivets lines dedicated to the stainless plate.

Kyle Boatright 03-12-2018 01:10 PM

Quote:

Originally Posted by rleffler (Post 1245436)
I don't know how either Mike or Kyle assembled theirs, but I would not use the rivets in the plans to ensure no compromise to structural integrity. I would off set rivets lines dedicated to the stainless plate.

That's what I did. The primary structure is per plans. The pop rivets for the overlay are just there to attach the stainless sheet.

ppilotmike 03-12-2018 03:06 PM

My belly shield does, in fact, use the rivets that attach the ribs to the bottom skin. I used rivets slightly longer than the ones called for by the plans, in order to get the proper diameter/height on the shop head.

Keep in mind, that 1) my belly shield is not the full length of the bottom skin, only the first 18 inches or so, 2) the Fiberfrax crushes a little at the point of attachment, leaving very little thickness at the rivet lines and 3) the SS sheet would add a bit of tensile capacity to the bottom skin.

It would probably have been better to use separate/extra rivets to secure the SS sheet/FF to the belly (I thought of that for my firewall), but, for my small belly shield, I didn't do it that way.

jeffwhip 03-12-2018 07:08 PM

Quote:

Originally Posted by DanH (Post 1245355)
Do this ^^^^^

Dan,
Do you have any pictures of what that looks like?

Jeff

Kyle Boatright 03-12-2018 09:19 PM

Quote:

Originally Posted by jeffwhip (Post 1245520)
Dan,
Do you have any pictures of what that looks like?

Jeff

Here you go (I think)...


jeffwhip 03-17-2018 04:33 PM

Thanks! That's what I'm looking for.

Walt 03-17-2018 04:53 PM

If it was me, I'd want to be sure the underlying skin was carefully prepared and corrosion proofed before riveting a plate on. Once you install it inspection will become impossible, and there is a good chances of moisture getting in between the 2 skins and with the dissimilar metals it could be a problem down the road. It would be more work but maybe worthwhile if you're building to use screw/nutplates to intall the sandwich.

Kyle Boatright 03-17-2018 05:00 PM

Quote:

Originally Posted by Walt (Post 1246540)
If it was me, I'd want to be sure the underlying skin was carefully prepared and corrosion proofed before riveting a plate on. Once you install it inspection will become impossible, and there is a good chances of moisture getting in between the 2 skins and with the dissimilar metals it could be a problem down the road. It would be more work but maybe worthwhile if you're building to use screw/nutplates to intall the sandwich.

Unless you start your -10 fuselage with this in mind, retrofitting nutplates under the floorboards will be a bear. That said, yes, do put a coat of epoxy or zinc chromate on the aluminum to protect it.

Weasel 03-18-2018 08:46 AM

Another one
 
Quote:

Originally Posted by jeffwhip (Post 1245520)
Dan,
Do you have any pictures of what that looks like?

Jeff


If I remember used 0.005" SS



rdrcrmatt 03-18-2018 12:27 PM

Stupid question, what's the purpose here?

I can only think it is to insulate from the heat of the exhaust.


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