[PSUBS-MAILIST] Diesel Exhaust

[Marc de Piolenc]

My thought was to employ the snorkel only on the surface, and only to 
prevent waves from swamping a lower air intake trunk. That would also 
keep back-pressure on the diesel exhaust from becoming an issue.

Basically, I would never deliberately undertake operations in anything 
but fine weather, but for the unforeseen would specify Sea State 3.

Best,
Marc

On 10/12/2013 1:33 AM, MerlinSub at t-online.de wrote:
> Hi Marc,
>
> before I response in detail, which size should the sub have? And which
> range?
>
> And which kind of wave high, wave length and weather you want to survife
> on the surface?
> Any concept sketch? Do you like to snorckel with the sub?
>
> Euronaut has more problems with the short medium high wave in the baltic
> than with the high but long waves in the north sea.
>
> Bad weather in the north sea lift the hole boat before the wave reach
> the sail, but in the Baltic the waves are
> shorter and did mot lift the boat so much - as result the sail goes very
> wet. Like in the movie "Das Boot"
>
> Short wave in the baltic:
> http://www.euronaut.org/content/gfx/operational/IMG_8705.jpg
>
> Here the over waterline exhaust of Euronaut in operation.
> The funny sound comes from a wave flap close to the end of the exhaust
> which goes up and down at idlle speed.
> http://www.youtube.com/watch?v=PT7i05s92ak
>
> Cooling is also something you should have in mind.
>
> And noise..
>
> And..
>
> vbr Carsten
>
>
>     *From:* Marc de Piolenc <piolenc at archivale.com>
>     *To:* personal_submersibles at psubs.org
>     *Sent:* Thursday, October 10, 2013 10:15 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
>
> --
>
> 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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>

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