Patrick,Diesel electric submarines are not always "diesel electric" in the sense that they operate d.generators to run electric motors - often
you have two independent powertrains - one electric - the other diesel.In a Psub diesel sub - the diesel is used to transit to and from a dive location - mostly surfaced. That is most economic done with something like a ordinary diesel / mechanical gear - clutch box as in any motor yacht. They are available down to 8 - 10 hp fitting nicely with a 3 ton submarine
Submerged the diesel is tuned off and the exhaust is closed with a valve. The gear box lever is set to neutral - and a diminutive e motor is then used to propel the boat at much lower speed. Surfaced you might design for 3 hp pr. ton, while submerged you will need about 0.5 to 1 hp pr ton. Its really not very difficult and will improve you boats range ten if not hundredfold.
As usual - the bigger the better. A long hull give high speed a short give low surfaced speed. I in any way possible go for a boat the like most ships stays in the water and is transported on water. Its much simpler than trailers and tight weight budgets.
These views are of cause my own, and I will defend anybody's right to be disagreeing with me...
Regards Peter Madsen----- Original Message ----- From: "Patrick" <pat_man_ta@hotmail.com>
To: <personal_submersibles@psubs.org> Sent: Wednesday, September 26, 2007 5:07 PM Subject: [PSUBS-MAILIST] Diesel Generators
I've been searching around to try and find the smallest of the small marine diesel generators but so far the smallest one I've found is about 130 -210lbs and I'm not even sure they'd be appropriate for use inside a psub.Does anyone run small scale D/E in their sub? If so, what are you using? ~patrick (creeping out of the shadows) Ref.: http://www.kohlerpower.com/marine/detail.htm?sectionNumber=13461&categoryNumber=8361&prodnum=71561 http://www.centralmainediesel.com/order/4300N.asp?page=4300N ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************
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