[PSUBS-MAILIST] Dive report - Pickles Reef

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. 

The problem in real is more : If you stop the diesel for diving and
close the hatch to dive and run electric. 

The inside goes pretty hot and dusty because you have some big block of
hot metal (engine, gear , compressor etc) 
in you engine chamber..  Nice here in norther europe during the winter
period.. 
Will not imagine what it means in the caribiean during summer. 

 vbr Carsten DSO  (- Diesel Submarine Operator- )

"hank pronk" <hanker_20032000 at yahoo.ca> schrieb: 
Marc,
I would think you will need an ac unit on your engine because the engine
will generate some heat even with a water cooled manifold.  If you run
the exhaust stack inside the air stack it will pre heat the air coming
into the engine.  Pre heated air is good in northern latitudes but bad
in the tropics.  The heated air will kill your fuel efficiency.  I also
would not suck the combustion air through the hull, the exhaust will
find its way in.  I would do a short air stack and a tall folding
exhaust stack.   A diesel engine in a psub is a great idea.
Hank



From: Marc de Piolenc <piolenc at archivale.com>
To: personal_submersibles at psubs.org 
Sent: Thursday, October 10, 2013 8:15:44 PM
Subject: Re: [PSUBS-MAILIST] Dive report - Pickles Reef


I've been following this discussion with great interest. I don't have a

sub yet, but I do live in the Tropics, and as there's no cold current 
handy to where I live any subbing I do will be in water pretty near air

temperature. As you might expect, I've given this problem a lot of
thought.

My tentative conclusion is that, if I build a sub, I will have to make 
it more autonomous than is the rule on this list. Specifically, it will

need a combustion engine to ferry itself on the surface to dive sites, 
and to maintain comfort and keep the battery topped off for diving while

doing so. I started with the assumption that I would need an air 
conditioning unit running off a small industrial diesel, but then I 
realized that, if I use a snorkel exhausting into the cabin, and have 
the diesel draw air from the cabin, I get continuous renewal of the air

in the cabin without the cost, power burden and safety problems of 
running a Rankine cycle refrigeration system. That's the solution that 
I've retained for the moment. Of course I also need a secure means of 
preventing exhaust gas from being aspirated into the snorkel (I can't 
quite understand how naval submarines manage to combine both functions 
in one mast), but that might be as simple as having the diesel exhaust 
flush with the hull, with some arrangement to prevent water from coming

in. Since the diesel would only be used on the surface, and the snort 
would only be there to allow a low-freeboard hatch to be kept closed, 
the power penalty would be minimal.

Fuel storage, fuel feed and the like still have to be worked out. Naval

submarines have very complex arrangements for this, and that complexity

must be tolerated for a good reason. Even so, I need a simpler way to do

it that still protects the fuel from contamination and me from
asphyxiation.

Marc de Piolenc

On 10/11/2013 1:45 AM, Land N Sea wrote:
> I have been out of the loop for 5 weeks on the mainland on my sailboat
> and I should of read all the emails before responding when I got back. I
> did view the great footage and noticed that my tower looked a little
> taller (good for water ingress) and of course doesnt have the dome so I
> hopefully wont have quite as bad of a heat problem as one with the dome
> but I was thinking about Emiles clear acrylic fairing as an option when
> I heard about the water egress problems with a three foot chop.
> It does get pretty hot here and we are about the same latitude as
> Florida so I will probably be trying Phils idea of the frozen pouches
> vest and or the gallon of frozen water and have the air coming out of my
> scrubber blowing against it.
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Carsten at euronaut.org
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