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Old 07-02-2014, 08:19 PM   #1 (permalink)
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Nice way to get aero shape.

Man Pours Strange Gunk All Over His Car. You Won't Believe What Happened Next... | SF Globe

This guy might not have made the most aerodynamic design but the possibility is there. I have some ideas for some things now anyway.

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Old 07-02-2014, 09:19 PM   #2 (permalink)
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It would actually work pretty good to make a kammback for a car.

You could pour into a cardboard mock up , so you get it basically right in the first pour.
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Old 07-02-2014, 10:15 PM   #3 (permalink)
...beats walking...
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Foam-wrapping instead of bubble-wrapping!
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Old 07-03-2014, 10:54 AM   #4 (permalink)
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Wicked. Nice find. It started out shaky, but had a nice finish.

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Old 07-03-2014, 11:22 AM   #5 (permalink)
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Old 07-03-2014, 11:42 AM   #6 (permalink)
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thought I had seen this thread before!
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Old 07-03-2014, 02:21 PM   #7 (permalink)
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Well, they claim the first thing to go is the mind, but I can't recall what was second...or third...or fourth...
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Old 07-03-2014, 02:30 PM   #8 (permalink)
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I've see that Russian guy thing before, pretty amazing what determination can do with little resources.

The issue facing many of the weight sensitive home built hovercraft builders is the foam will absorb moisture right out of the air/atmosphere.

You don't even need a pin hole leak, leave it out in the rain, or floating in the water for the weight gain due to air moisture content to show up.

Maybe a car can deal with this weight gain better than a hovercraft.

I do like that the foam is an energy absorber in case of accident though.
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Old 07-03-2014, 02:39 PM   #9 (permalink)
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Jethro made the aero back for his vw a few years ago.
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Old 07-03-2014, 06:20 PM   #10 (permalink)
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Quoting myself from this thread:
Consider plywood for the ribs and cedar for the skin. A friend of my[sic] built a egg-shaped house on a Ford flatbed truck back in the 70s. He made plywood ribs, ran light wood stringers and shingled the whole thing. When it was done he had it sprayed out inside with polyurethane foam. What was a wobbly structure turned into a solid block of foam with the shingles embedded in the outer surface.

Where he shingled it vertically like a stationary house, you could turn the shingles 90° so they lay like fish scales.
Edit: He laborously hand tapered each shingle to fit. If I was suggesting it today (as I had then), I'd go for beveling each shingle[s thick edge], hot-melt gluing each one and using a geometry more like this:


Last edited by freebeard; 07-03-2014 at 06:41 PM..
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