Re: [PSUBS-MAILIST] Electric Propulsion

[MerlinSub@t-online.de]

http://www.uboat.net/types/v80.htm

http://www.uboat.net/types/schwertw.htm
http://de.wikipedia.org/wiki/Schwertwal_(U-Boot)
http://www.u-boote-online.de/typen/schwertwal.php
http://www.ubootkruse.homepage.t-online.de/html/schwertwal.html

Schwertwal with 32 knot at 18 ts at 800 hp is 44,4 hp per ts
V80 with 30 knot at 70 ts at 2500 hp  is 35,7 hp per ts. 

If we go with a first quick shoot with 40 hp per ts you need for your 50ts sub around 2000 hp 
or around 1500 kw and on a teardrop hull a counter rotating prop system. 

My lead acid batt have around 26 kg weight per 1 kwh power capacity so for 1 hour at 30 knots 
you need about 1500 x 26 = 39 ts of battery for just 360K USD, means you have still 11 ts for the shell the electric motor and all of the equipment. 

If you go for 30 knots and a half hour full speed you need 19,5 ts of battery and 30,5 ts remains. A more realistic figure. And just 180K-USD
And maybe the needed anti-colison sonar for that speed cost more that the batterys.. 

What is the reason for that high speed? 

My 57ts sub runs abt. 4-5 knots on 40 kw electric power for around 6-8 hours. 

A picture /drawing would be nice..

vbr Carsten 


"Firebolt" <spartan67@live.com> schrieb:
> 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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