[PSUBS-MAILIST] Diesel Psubs

[hank pronk]

I have been toying with the idea of a small air cooled engine that I can remove from an air tight compartment inside the sub.  I would place it on the deck outside the sub and it could charge batteries on the fly.  Not good in rough water, but it could extend the range of the sub.  I think a 6hp motor could drive a 24v 70a alternator and it would fit through the hatch easily. I used to charge the batteries in my orange sub that way because the sub was moored full time.
Hank

From: "MerlinSub at t-online.de" <MerlinSub at t-online.de>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Saturday, October 12, 2013 10:35:00 AM
Subject: Re: [PSUBS-MAILIST] Diesel Psubs



Marc exact that..

- Close the door of the engine compartment helps.

- stay a time on the surface before diving helps also -but not so much. 
    On a close enviroment like a submarine the machinery is still hand warm on the next day..

- The pressure tight cooling system is exact what I did. But for other reasons.

  A normal boats diesel cooling has a internal freshwater cecurit with a pump on the engine for the freshwater. 
  than a heat exchanger between the interank freshwater and the external seawater and a seawater pump for the external seawater cecurit. 

 For saftey reason I go for a single loop. Means only the freshwater sytem but running to the outside pipes and pressure tight. Caleld "keel cooling system" here. Many fishing vessel here have aht simple system. Only one pump, no heat exchanger and no vales to close before diving on the cooling system. Of course there are two valves - but just for emergency closing if the outside pipe system is damage - very unusual by angle bar pipes made of one inch strong steel. 

 In general the system can be use to cool the engine block down. But my freswater pump is direct driven by the diesel via a  belt and will not operate underwater. And I think it is wrong to cool the diesel down that way - maybe you need his force short after surfacing. 

On a psub size sub it makes sence to run the diesel just as electric powergenerator in his own sound box. 
Purchase of the shelf ready with all auxillariy systems. On a bigger sub like Euronaut it may mmakes more sences for a direct diesel driven propeller gear with a auxillery generator to load the batteries and drive the baot underwater. 

vbr Carsten

"Marc de Piolenc" <piolenc at archivale.com> schrieb:
> My thinking exactly in planning air intake into the cabin, drawn by and 
> into the engine.
> 
> Good point about residual heat when diving. My only "solution" to this 
> would be to provide a thermosiphon loop that would continue cooling the 
> engine's heat exchanger while diving, but that would of course mean that 
> the whole heat exchanger system would have to be built to withstand full 
> dive depth. Not very satisfactory. I suppose one could either close off 
> the engine compartment while diving or just spend some time on the 
> surface prior to diving to allow the heat to dissipate.
> 
> Marc
> 
> On 10/12/2013 1:56 AM, MerlinSub at t-online.de wrote:
> > Breathing air for the diesel engine from inside the cabin is very common
> > to clean the cabin air. Air goes in the cabin via the open hatch.
> >
> > It also remove the little leaks from the exhaust and the oil dust. And
> > works very well on the surface.
> > In Euronaut the diesel air inlet is from the battery bilge compartment
> > to vent also the battery gases during charing them on the surface run.
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-- 

Carsten Standfuß
Dipl.Ing.Schiffbau @ Meerestechnik
Heinrich Reck Str.12A
18211 Admannshagen

0172 8464 420
WWW.Euronaut.org
Carsten at euronaut.org
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