Douglas Butler wrote:
>
> For high power deep work they use hydraulic prop motors.  There is a
> central hydraulic pump with an oil filled electric motor.  Those systems
> are usually 10 to 1000 horsepower.
> My company (Imetrix) uses electric 1/2hp to 1hp off-the-self
> magnetically coupled thrusters.  They have an electric motor & gearbox
> which spins permanent magnets in an air filled stainless steel cup.
> Magnets outside the cup drive the prop.  If we had to custom build
> something the pancake motor idea might work.  For a model the VCR motor
> might be a place to start.


What about using a rotorless system like in
the movie Red October?? If you apply electricity
to the water itself you can move it with a magnetic
field. There are a few experiments like this on
the net. Model "stealth" sub anyone?? ;o)
-Roman

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