Re: [PSUBS-MAILIST] E-MHD NEWS!

["Richard Gordon" <lrrg@wantree.com.au>]

Thanks for the advice! I'll definitely look into that. I wouldn't say it is
more efficient than a prop, but probably almost as efficient. The main
advantage is that it has has no moving parts, therefore less frictional
losses, leading and trailing edge losses, noise, turbulence, any of the
things which can reduce an engines efficiency or reliability. And requires
NO mechanical linkages through the hull (a personal hate of mine).

There have generally been two kinds of E-MHD engine. Firstly there are the
ones that Lynn was describing (Yamato1 style), secondly there are
'caterpillar' style engines such as those in 'Hunt for Red October'. The
caterpillar drive is slightly different in that does accelerate only the
water directly. The magnetic field comes from an annulus filled with a
ferro-liquid which surrounds the inner tunnel. Electromagnetic pulses are
sent through the ferro-liquid to produce a sympathetic movement in the
water. I know extremely little about this kind of E-MHD, apart from the fact
that it was experimented with by somebody at some stage.I hope that clears
up some of it for you. Thanks once again.

Rich


----- Original Message -----
From: <TeslaTony@aol.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, February 27, 2001 1:41 AM
Subject: Re: [PSUBS-MAILIST] E-MHD NEWS!


> Try submitting a bit about it and some pictures to New Scientist,
Scientific
> American, Popular Science and Popular Mechanics, because anyone who has
> enough money to develop one of these things and knows a bit about subs
would
> love to have one of these things, especially if it is more efficient that
a
> prop.
>
> Just out of curiosity; how does this thing work? I've heard about E-MHD
> systems before (Hunt for the Red October, the Yamato 1), but have never
heard
> quite how the system is supposed to work.
>
> Anthony
>