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Re: [PSUBS-MAILIST] Electric Propulsion
Underwater the main component of drag is viscous, so drag is
proportional to the square of the speed, and power required is
proportional to the cube. So to triple your underwater speed from 10 to
30 knots requires twenty-seven (three cubed) times the power. This is
not a feasible undertaking unless you provide a completely separate
power plant with a very concentrated power source - maybe a Walter
hydrogen-peroxide turbine. Just sizing your electrical installation for
this power range is impractical.
Marc de Piolenc
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Polymath weblog: http://www.archivale.com/weblog
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On 9/30/2010 10:18 AM, Firebolt wrote:
Hello Again thanks everyone for the shaft seal info, I appreciate it. I
am down to only a few more things I need to know, the electric motor.
For me I will want to travel at a speed of 10 knots under water
_but_ I would like for there to be a possibility for me to go faster,
say, 25 to 30 knots. I know it depends on the dimensions of the sub, it
will most likely weigh 50 tons since it is 60 ft and 10 ft inside
diameter. this is not a cylinder shaped sub though
if you want a picture I will give it to you just tell me. I thought
about a 70 kw motor but I don’t know if it will give me the speeds I
want. And if you can, I want to know what the best battery would be to
power the sub with lots of electronics and appliances (TV's, microwave,
water pumps etc.)
I await your assistance.
John
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