Interior walls

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fallguy1000
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Re: Interior walls

Post by fallguy1000 » Fri Dec 13, 2019 5:19 am

I am considering 3mm komatex for headlining...or 6mm. The 3mm is 13 pounds for a 50x100 sheet. The 6mm won't sag much, but is heavier. I am doing some sag calcs.

Then the komatex might work nicely for some of the interior panels, too.

Wood's said to use marine 12mm foam for the cabinets, but then biax seems way to heavy.

The komatex is a white panel; not as hard as glass and epoxy, but way cheaper than marine foams at about $75 a sheet in 6mm and $35 in 3 mil; perhaps $120 in 10mm.

I have decided that all komatex lining of the cabin walls is too heavy. So, we will headline with it to hide wires ftmp, in the manner you described for the catanas. The komatex looks really nice, but we need to manage the cte. The temp range is -35C to 35C on Superior and it will buckle of we don't allow it some movement.

If you have any ideas on kitchen and benches; let me know. I am leaning towards using 6mm marine foam (have it) in some fashion; some komatex, locker or cabinet dividers, and combining materials. The komatex can be glassed as well. The surface dents to a fingernail. Perhaps a 6 oz woven each side or one side would be low cost and faster build. I am looking for some speed now.


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fallguy1000
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Re: Interior walls

Post by fallguy1000 » Fri Dec 13, 2019 5:32 pm

Well, I did some calculations and interior walls sure are a
Pita to plan.

I can use
Plywood
Komatex
Core with some amount of glass on...

All can be tabbed with glass.

Each has pros n cons.

Plywood-build speed, stiffness
Cons-heavy

Komatex-lighter than ply, but saggier. No finish required, surface will dent with fingernail; cost sim to ply; comes in white.

Corecell-expensive, super slow to build ultralight, hard to plan scantlings, ultralight, more epoxy cost!
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Jaysen
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Re: Interior walls

Post by Jaysen » Fri Dec 13, 2019 5:52 pm

What about ply in high wear/impact areas and the kormex for others?
Jaysen wrote:
Mon Apr 29, 2019 3:44 pm
I tried to say something but God thought I was wrong and filled my mouth with saltwater. I kept my pie hole shut after that.

narfi
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Re: Interior walls

Post by narfi » Fri Dec 13, 2019 6:37 pm

I think I like the idea of textured paint (tinted truck bed liner is polyurethane and durrable)

Do you still have your vacuum table? What about getting a carbon weave that looks nice and making thin panels you glue in place and trim the seams with something decorative?

fallguy1000
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Re: Interior walls

Post by fallguy1000 » Fri Dec 13, 2019 7:07 pm

Jaysen wrote:
Fri Dec 13, 2019 5:52 pm
What about ply in high wear/impact areas and the kormex for others?
Yeah. I am just trying to decide when to use core.

For the headliner, I could design a 6mm corecell panel. It is 7 times lighter than komatex.

I did sag calcs and the komatex will sag if unsupported more than 17" square. 17" square sags 1/16". My buddy cocked his head like a dog on this subject. He doesn't understand how a panel fastened on all sides can sag under its own weight. The komatex 3mm panel sags about 0.200" at 24" square supports.
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Jaysen
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Re: Interior walls

Post by Jaysen » Fri Dec 13, 2019 7:56 pm

What about a tack adhesive to secure the panels? 3m spray contact would hold to reasonable temps. The only difficulty might be in areas that you want easy access behind the panels.
Jaysen wrote:
Mon Apr 29, 2019 3:44 pm
I tried to say something but God thought I was wrong and filled my mouth with saltwater. I kept my pie hole shut after that.

fallguy1000
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Re: Interior walls

Post by fallguy1000 » Fri Dec 13, 2019 8:20 pm

Jaysen wrote:
Fri Dec 13, 2019 7:56 pm
What about a tack adhesive to secure the panels? 3m spray contact would hold to reasonable temps. The only difficulty might be in areas that you want easy access behind the panels.
Velcro could be removed and would help my span issue
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Netpackrat
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Re: Interior walls

Post by Netpackrat » Sat Dec 14, 2019 2:28 pm

I like the light fairing with satin paint that Evan posted. Keeps it simple, plus easy to inspect and clean.

fallguy1000
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Re: Interior walls

Post by fallguy1000 » Sat Dec 14, 2019 4:33 pm

Netpackrat wrote:
Sat Dec 14, 2019 2:28 pm
I like the light fairing with satin paint that Evan posted. Keeps it simple, plus easy to inspect and clean.
We are going to use some combinations.

I need headliners in both the cabin and the two cabinettes. So, we will headliner with something and use fairing on places we don't need to run wires and stuff.
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Evan_Gatehouse
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Re: Interior walls

Post by Evan_Gatehouse » Thu Dec 19, 2019 7:23 pm

If you spring a panel upward and secure with battens to furring strips you can prevent sagging...I.e. Put in a bit of upward prebends.

I also used Sinatra, an expanded foam PVC board available in 1/8" and thicker. Very slight textured surface, bright white, could take screws with finishing washers. Nice stuff. Cuts with a utility knife.

For lining I'd never make up foam/glass panels - too much work!
designer: FB11/GV10,11,13/ HMD18/
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