Re: [PSUBS-MAILIST] Electric Motors

["Jacob Lauser" <sirius@riverstyx.com>]

Graham,

I read the article on oil compensation and it said recommended to 33 feet,
but with the oil compensation, only to about 150 feet. Was I mistaken in
what I read or will they go to 350 feet? Also, are they powerful enough to
run a 7-bladed  nuclear boat-type prop at a sufficient speed to push a 4-ton
boat at 6 knots for extended periods?

- Jacob Lauser
----- Original Message -----
From: "Graham K" <cryogenicz@dsl-only.net>
To: <personal_submersibles@psubs.org>
Sent: Sunday, June 30, 2002 3:49 PM
Subject: RE: [PSUBS-MAILIST] Electric Motors


> If you take a minn kota motor and fill it with transformer oil, it should
be
> able to go to any depth because of the oil compensation.
>
> GK
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Jacob Lauser
> Sent: Sunday, June 30, 2002 3:34 PM
> To: personal_submersibles@psubs.org
> Subject: [PSUBS-MAILIST] Electric Motors
>
>
> Aside from shallower designs using MinnKota motors, what are people using
> for the deeper boats these days? I was looking at my favorite power
systems
> specialist's webpage last evening (Ballard Power Systems), and I saw some
> awesome looking motors that might be perfect for submarine application,
> assuming you could power then from a battery bank and keep it charged.
What
> so you guys think of these? Now, keep in mind that I am operating simply
on
> a "will-it-work-mechanically-and-electrically?" viewpoint and not a cost
> approach. Here is the link: http://www.ballard.com/tD.asp?pgid=66&dbid=0
> Assume direct drive of the screw through a shaft and gear reducer, if
> necessary. I was looking at the smaller units for starters. My boat will
> displace about 4 tons. I'm shooting for approximately 6 knots, and a lot
of
> effort is being spent on a highly efficient and quiet screw. Maybe, I'll
> shroud it while in port. ;) Any thoughts on these motors or suggestions on
> better ones?
>
> - Jacob Lauser
>
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