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Last Project of the Semester: Underwater Submersible

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Last Project of the Semester: Underwater Submersible

Unread postAuthor: cash68 » Fri May 11, 2007 9:11 am

K. I mentioned this before, but here's the basics: We had to design a towable submersible that could house at least two transducers, and we had to do drafting style drawings, make a buck, then pack clay, then carve the clay, smooth it, cast it in plaster, and then use FRP, most people used fiberglass.

Here are some pics of the process:

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Pretty rough. After about... oh... maybe another 5-8 hours, I was around here:

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It still wasn't close. I probably have about 15-20 hours into trying to iron out all the bugs in the clay. It was fun. Luckily I had some booze to help numb the pain of such tedious work.

Oh, to carve clay, you need a rake. I made mine myself. It's a nice piece of walnut I turned on the wood lathe, then french polished with walnut shavings, and I made the rake itself outta diamondplate polished aluminum. Oh yeah. :P

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After you have the clay where you want it, you cast it in plaster. I did something kinda funky with mine, I cast it with an overlap of about 1/8 of an inch. Why? Well, in one of the molds, I put a 1/8" piece of styrene all the way around, so hopefully, after I made my fiberglass pieces, they'd snap together, because of the lip. I also found some plastic just a bit thicker than the plastic I wanted to make fins out of, so I used clay to fiberglass a slot into the back of the form, allowing the real fin to fold into it... kinda hard to explain: Pic:

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Here's a pic once I epoxied the fiberglass pieces together, with the dorsal fin just shoved into the slot. Oh yeah, the front of the piece is dark, because I decided to use carbon fiber. :) No reason really, I just found some scraps and threw them in instead of fiberglass. The resin was too yellow to let me use it aesthetically though, so there wasn't really a point. I did learn how differnet it was to work with though. It's a lot stiffer. Anyway:

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After about 2-3 coats of massively thick primer, a bit of bondo, spot putty, and one RUINED paintjob thanks to the compressor not turning back on to maintain pressure, then having to sand the whole thing back down and respraying it with white laquer, and a clear coat with some green pearl, it looked decent. The decals were designed by me, and printed onto testors decal paper with my inkjet printer. After the decal sheets dry you spray them with 'decal fixative'. Then you simply cut them out and apply them like any model car decal. It turned out pretty decent, I think:

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Hope you guys enjoyed learning about the process.
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Unread postAuthor: jackssmirkingrevenge » Fri May 11, 2007 9:19 am

very nicely done - and the technique could easily be applied to making futuristic halo-type body shells for spudguns :D
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Unread postAuthor: jimmy101 » Fri May 11, 2007 2:11 pm

Damn, that's nice.

A college level class? What was the class title?

BTW; an "underwater submersible" is kind of redundant.
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Unread postAuthor: surfbum » Fri May 11, 2007 3:01 pm

awesome finished product
the paint and the decals make it look really professional

is the top fin supposed to be able to recess into the body?
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Unread postAuthor: paaiyan » Fri May 11, 2007 3:14 pm

jimmy101 wrote:Damn, that's nice.

A college level class? What was the class title?

BTW; an "underwater submersible" is kind of redundant.


I agree, rather redundant, but still a sweet project! I could never hope to do something like that, I'm not artistic enough, poop.
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Unread postAuthor: Pyro Ninja » Fri May 11, 2007 4:50 pm

looks nice and professional :D
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Unread postAuthor: wannabie » Fri May 11, 2007 5:16 pm

very nice you should make a shell for a spud gun like jack said :)
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Unread postAuthor: cash68 » Fri May 11, 2007 6:08 pm

jimmy101 wrote:Damn, that's nice.

A college level class? What was the class title?

BTW; an "underwater submersible" is kind of redundant.


Uh, yeah, if you're going to an industrial design college. :P

@ whoever, yeah, the dorsal fin folds into the slot, and the side fins fold into the scalloped sides with the concave surfaces.
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Unread postAuthor: spudzinger » Fri May 11, 2007 6:16 pm

Actually, its not really that redundant more just specific. There could be underground submersibles (moles,gophers,etc.), underfoliage, underozone. Lol, just giving you a hard time. Is this thing like a fish finder for more scientific uses?
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Last edited by spudzinger on Fri May 11, 2007 6:20 pm, edited 1 time in total.

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Unread postAuthor: keep_it_real » Fri May 11, 2007 6:18 pm

I just forgave you for the whole aquiteas sniper thing...

That's beautiful
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Unread postAuthor: jrrdw » Fri May 11, 2007 6:57 pm

Nice job! If you said how your towing it, i missed it??? A rope will let it spin, no matter what. So will a chain. A pole with ridged hook ups will tow it with control.
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Unread postAuthor: cash68 » Sun May 13, 2007 9:57 pm

spudzinger wrote:Actually, its not really that redundant more just specific. There could be underground submersibles (moles,gophers,etc.), underfoliage, underozone. Lol, just giving you a hard time. Is this thing like a fish finder for more scientific uses?


It's a model. I guess it was too good, as I think some people think this is functional. It's not. It's a model of what my design would look like. It's supposed to find underwater logs.... about 10-15% of logs floated down rivers and across lakes a hundred years ago became waterlogged and sank, and now they're worth about 1-10 grand EACH, so there's a pretty bug underwater log finding business now.... also known as 'reclaimed' wood.
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Unread postAuthor: Velocity » Sun May 13, 2007 10:11 pm

cash68 wrote:about 10-15% of logs floated down rivers and across lakes a hundred years ago became waterlogged and sank, and now they're worth about 1-10 grand EACH, so there's a pretty bug underwater log finding business now.... also known as 'reclaimed' wood.


uhh... why?

By the way, this looks really nice.
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Unread postAuthor: turbohacker » Sun May 13, 2007 10:27 pm

It's Propobly for furnature, the wood i mean
Very nicly done
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Unread postAuthor: frankrede » Mon May 14, 2007 12:20 am

thats amazing.
My favorite part is the USB logo.haha wtf.
I tipp my hat to you.
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