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Øystein,
350 lb thrust will require in the order of 10 -15
kW electric motor. To power this regardless of voltage you will consume battery
power equivalent to
500 - 1000 kg batteries pr. hour of operation.
It can be done with 24 or 48 volt motors - and if this is your intention look
into the motors used on electric forklifts or electric cars. In this I assume
you will have the motor(s) inside your pressurehull.
If the electric motor is only engaged when diving -
it is the only solution and its ok since you are not likely to travel long
distances submerged . But if you plan to sail the boat surfaced on batteries you
will find that if the range required is more
than a very few nautical miles, the electric propulsion is very expensive,
and very inefficient. If you add even the smallest marine diesel engine to
your boat you will be able to improve range hundredfold.
A submarine propulsion system can consist of a
standard marine diesel engine with a reduction / reverse / clutch gear device
and an electric motor driving the propellers haft via V - belts when the marine
engine is stopped and the gearbox lever is in neutral. This is how simple its
done on our boat Kraka - and it works fine.
I looked at your drawings - I assume a sail will be
added to the concept ?!
Regards,
Peter Madsen
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