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Isn't there a water heat exchanger, that you can pump sea water through and then through another set of pipes you circulate the motor cooling fluid. Thus keeping salt water out of the engine block? Or is a keel cooling unit a better and simpler option? Regards, Brent Hartwig > From: pirate@arach.net.au > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] sub plans > Date: Tue, 26 Feb 2008 12:39:06 +0900 > > Gday Carsten. > The thoughts I came up with regarding the use of an air cooled engine > are,keeping to a minimum the piping through the pressure hull and therefore > eliminating a number of shut off valves, and with internal air ducting to > the conning tower this provides a very effective means of changing the total > volume of air in the sub, > An alternative to this would be to locate the engine in an external pressure > pod that could be kept automatically at the pressure the sub is operating > at. > This would eliminate heat within the interior of the sub and create a lot > more living space.It goes without saying that an aircooled engine is much > lighter than water cooled, does not have the problem of heat exchangers for > fresh/saltwater cooling and reduces corrosion of the block. > As I said before at this stage these are just thoughts and the more feedback > I get the more I learn,and if you have any ideas I would be grateful. > Thanks again > Clive > ----- Original Message ----- > From: <MerlinSub@t-online.de> > To: <personal_submersibles@psubs.org> > Sent: Tuesday, February 26, 2008 5:51 AM > Subject: Re: [PSUBS-MAILIST] sub plans > > > Air cooled diesel? why? > > regards Carsten > > > "Clive Wood" <pirate@arach.net.au> schrieb: > > Gday again Ian. > > At the moment I am just in the thinking phase prior to design phase, these > > are my thoughts to date. > > Built as a yacht that can be lived on for periods up to about one month > > with > > 6 persons on the surface. > > An endurance of 24 hours underwater for 6 persons with emergency air and > > power for 5 days. > > Air cooled diesel (surface) and 4 x 72 volt electric motors (submerged). > > 40 inch acrylic hemispherical viewport in the bow for pilot and 4 x 10 > > inch > > viewports for observers and C S television astern and above. > > A manipulator arm at the lower bow operated electrically rather than > > hydraulically. > > I have no ideas as yet as to the type of batteries that would be most > > suitable, external saltwater batteries would be interesting but would not > > deliver anything like the power needed for the main drive etc but may be > > useful for emergencies and lights etc ( very low power but long life ). > > Able to fill air tanks while travelling on the surface and with a depth > > capability of 600 feet. > > These are just basic ideas at this stage and the reality may be quiet > > different subject to cost etc but it would cut out the cost of a support > > ship. > > A friend of mine who builds ROV's as a hobby and myself have an interest > > in > > marine salvage and this is the purpose the sub will be used for. > > Well I will leave it at that for now and see what ideas I get back. > > Cheers Clive. > > > > > > |