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Re: acrylic; motors
I would suggest that my experience in all this stuff is pretty limited, but
i would have thought that although this sounds incredibly fun!!, do you not
have to have a way to surface fairly slowly, depending on how deep (>5m) you
are and how long you have been there? (>10min), maybe the air does not last
long enough for this to be a problem though. sounds like a simple and fun
idea!!
E.M.
> Hey, all.
>
> I was going to say "I built a su*b over the weekend," but then I wasn't
> able to.
>
> Nothing fancy. I sawed the bottom off a plastic 55-gallon drum which
> contained Mountain Dew flavoring, and sawed a little round window in the
> side, near the top. The idea is that I'll bolt together a steel frame (from
> an old bed) which goes over the top and down the sides, to hold a big heavy
> piece of iron some distance below it. Then I'll stand on this "keel" with
> my head up in the air pocket, and sink to the bottom in some not-very deep
> water, and maybe sort of Flintstone-car around with one foot.
>
> I guess it's more a diving bell than an actual sub, but I was desperate:
> it's been crazy-hot here, but standing in the lake one gets swarmed by very
> nasty biting flies. My solution is to stand around on the bottom. (Yes,
> I'll remember not to jump out and swim to the surface holding my breath.)
>
> Anyway, the point: the problem I had was wrapping the flimsy acrylic
> material I had lying around, to the curved surface of the drum. I went
> through 3 pieces. They have a tendency to crack suddenly while they're
> under tension from being wrapped, and I do things like drill holes in them.
> It seems I remember talk of using heat to curve some window material. Was
> it acrylic? How much heat? Can anyone give me a quick hint or two about how
> to do this?
>
> [*:-- Does the list software still automatically doo-doo on messages which
> contain "sub" in the first few lines?]
>
> Also --
> I've seen discussion here of electic motors sealed in oil to keep water
> pressure out, but I never paid much attention, because it didn't apply much
> to me. But now I'm wondering a couple of basic things: (1) So is oil like
> water then -- not very compressible? (2) Does this work with just any
> motor? Why doesn't the oil short out bare electrical parts, like brushes or
> whatever? Is oil not conductive?
>
>
> ---------
> David
> buchner@wcta.net
> http://customer.wcta.net/buchner
> Osage MN USA
>
>
--
emm03@uow.edu.au
Department of Engineering Physics
University of Wollongong
Wollongong, NSW
Australia
2522