Foamie hybrid thoughts...

Canvas covered foamies (Thrifty Alternatives...)

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Re: Foamie hybrid thoughts...

Postby mikeschn » Mon Jun 29, 2015 4:18 pm

Well that's some very good feedback.

So I'm getting ready to sit down and start a new model, using 2" Foam. Just have to decide between a 48" height + 2" of foam on top of that, which would be a slochie, or

54" height +2" on top of that, which would be a standie.

The hard corners is now a given. Pine or Cedar, which ever makes more sense when I'm at the big box store.

I'll shoot you guys some screenshots when I make some progress...

Mike...
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Re: Foamie hybrid thoughts...

Postby mikeschn » Mon Jun 29, 2015 6:30 pm

okay, here's my screenshots for the evening... This would be the slouchie

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Image

Image

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Re: Foamie hybrid thoughts...

Postby Mary C » Mon Jun 29, 2015 6:34 pm

Mike check out the blue foamie......https://www.flickr.com/photos/47726343@ ... 441749286/
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Re: Foamie hybrid thoughts...

Postby mikeschn » Mon Jun 29, 2015 6:37 pm

oh, one last pic... this one is kinda important. It's the hatch sealing mechanism!

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Re: Foamie hybrid thoughts...

Postby mikeschn » Mon Jun 29, 2015 6:38 pm

Mary C wrote:Mike check out the blue foamie......https://www.flickr.com/photos/47726343@ ... 441749286/


Mary,

That's a broken link. Can you tell me another way to get there?

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Re: Foamie hybrid thoughts...

Postby Mary C » Mon Jun 29, 2015 6:49 pm

Sorry mike I guess it happens Go to: Tearjerkers, dixie chapter, spring campout 2015, next to the last page the entry from Marvin marked pictures
It doesn't show my truck but that is in my galley on here.
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Re: Foamie hybrid thoughts...

Postby GPW » Tue Jun 30, 2015 7:10 am

Mike , I know it’s inconvenient to find a real lumber yard , but the Big Box stores have the worst wood and they are more expensive than the local yards ... Really !!!

Note: My buddy Vinnie ( new orleans guitar company ) uses Alaskan Cedar for prototyping .... it’s light , very clear , and bug and rot resistant ..... best of all it’s CHEAP too ... :thumbsup:
There’s no place like Foam !
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Re: Foamie hybrid thoughts...

Postby mikeschn » Tue Jun 30, 2015 5:25 pm

Oh darn, I hit a snag. When I open the hatch I end up with a hole in the side, for the mosquitoes. :? :cry:

Any ideas?

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P.S. Yes Glenn, I have just a place like that, about 2 hours north of here. I don't make that trip often, but maybe it's time...
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Re: Foamie hybrid thoughts...

Postby Fred Trout » Tue Jun 30, 2015 5:56 pm

Could do a "rule joint" like this at each of the end of the hatch:

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Re: Foamie hybrid thoughts...

Postby KCStudly » Tue Jun 30, 2015 6:24 pm

How do you deal with that using standard construction?

If you can keep water out it should keep the bugs out, too, right?

Can the part of the side wall that juts forward extend up to the top of the roof? If not, how about a thin piece of ply overlapping this area (it could be an organic shape or coordinated with other external embellishments, such as paint scheme or wings)? Not sure how that would keep rain out, tho.
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Re: Foamie hybrid thoughts...

Postby mikeschn » Tue Jun 30, 2015 7:29 pm

In standard construction, the sides go over the spars, and is covered with 1/8" plywood. There is a hole, but it is covered by the 3" of plywood forward of the hinge.

In foam construction the top has to be glued on top of the sides, in order to give it shape. Hence the problem.

Now lets suppose, that instead of gluing the foam to the top of the sides, I reverse it.

So I put a bunch of holes in the sides for the spars, 2" below the top. Then I glue the top to the spars. The shape is retained, and the sides cover the hole, as in standard construction.

I'll model that up tomorrow evening and show you guys.

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Re: Foamie hybrid thoughts...

Postby mikeschn » Tue Jun 30, 2015 7:34 pm

Fred,

Is that what KC is doing?

Image

Mike...

Fred Trout wrote:Could do a "rule joint" like this at each of the end of the hatch:

Image
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Re: Foamie hybrid thoughts...

Postby wagondude » Tue Jun 30, 2015 7:35 pm

Dowell the roof to the sides. No spars needed (unless you want them for some other reason). I would think in that area, the spars would be mostly just extra weight to lift with little extra benefit.
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Re: Foamie hybrid thoughts...

Postby KCStudly » Tue Jun 30, 2015 8:45 pm

No, that's not what I did. I rolled the bottom edges of the hatch side spar and added a concave block in the hopes that my hatch seal can run continuously up onto the forward face of the spar. When my hatch is open rain will be able to get in. :lol:

Why cant the front hinge spar be shorter bearing on the inner wall, and the roof be notched where the transition is between outer and inner wall to match. Then the wing wall of the lifting roof could fill the area in the notch. Again, I don't know how you would seal this sliding face so that it stays dry when open. Just throwing out ideas hoping to spark something.
Last edited by KCStudly on Tue Jun 07, 2016 6:46 pm, edited 1 time in total.
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Re: Foamie hybrid thoughts...

Postby KCStudly » Tue Jun 30, 2015 9:16 pm

Forgot to say, I had originally only intended to have 2x2 spars at the roof vent. The only reason I did more spars was because my ceiling panel (5mm ply) wanted to sag by itself, and I was/am building up from inside out. If you are doing wood skin inside you may run into the same problem due to the weight of the wood.

My logic was that it would be more work and cost to build a form to prebuild on, or to prop up the ceiling y\than it would be just to add a few more spars.

If you are pre-molding the roof and laminating the inner skin to foam off of the cabin, it will likely have plenty of stiffness to be installed without spars. This could be done using a couple of long roof ribs, similar to the way Aggie Tom did the Silver Beatle.
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