Water as weight rather than lead?

[MXGratefulDiver]

I once had a very experienced diver strongly disagreed when i tried to explain to him that if he flooded his drysuit, the volume of water in the flooded suit doesn't add net weight to the system until it is actually above the surface and not displacing the equivalent weight.

LOL - last year I met a guy on a charter who tried explaining to me why shell drysuits were inherently dangerous because if you flooded one "you'd sink like a rock".

He was an instructor ... :11:

... Bob (Grateful Diver)

 

[TCDiver1]

LOL - last year I met a guy on a charter who tried explaining to me why shell drysuits were inherently dangerous because if you flooded one "you'd sink like a rock".

He was an instructor ... :11:

... Bob (Grateful Diver)

Mr Neoprene drysuit, was he from Michigan? Sounds like the same guy except mine wasn't an instructor. Scary! :11:

 

[CBulla]

LOL - last year I met a guy on a charter who tried explaining to me why shell drysuits were inherently dangerous because if you flooded one "you'd sink like a rock".
(Grateful Diver)

:rofl: I dont even dive in one of those and I know thats wrong! HAH! I can't stop laughing!!

Hehe... if you flooded a dry suit, then it becomes a true wet suit!

 

[jhelmuth]

Replacing gas with water inheriantly makes the system heavier. But, of course, you can counteract that by adding an equivlant amount of gas to a BCD to offset it. Or you can shed some lead from the system - either way works.

 

[Seabear70]

I think you missed the chain that was being yanked Seabear.

I once had a very experienced diver strongly disagree when i tried to explain to him that if he flooded his drysuit, the volume of water in the flooded suit doesn't add net weight to the system until it is actually above the surface and not displacing the equivalent weight.

I know everybody in here is a tried and true diving wizard but in the real world not everyone picks up so readily on more technical concepts like this.

I actualy got the joke, but I'm a consumate braggert...

The flooded drysuit would not add actual weight, however, in not having it's normal boyancy, it would be effectively the same as adding another weightbelt to the diver.

I'm no diving wizzard, just a diving smart ***....

 

[MXGratefulDiver]

Replacing gas with water inheriantly makes the system heavier. But, of course, you can counteract that by adding an equivlant amount of gas to a BCD to offset it. Or you can shed some lead from the system - either way works.

True ... but as you say, it won't be enough to cause any real concern.

Now, heat loss will be another matter altogether ... :11:

... Bob (Grateful Diver)

 

[The Chairman]

You won't flood your dry suit if you use an Uncle Pug Pee Valve. Dats da truth!

 

[jhelmuth]

Ah yes! Another reason to love diving wet!

 

[Seabear70]

So where do they get their coolant?

(ducks to avoid flying objects)


... Bob (Grateful Diver)

Actually, taht's not as dumb a question as many people would lead you to believe.

In a submarine, stealth is everything, so running the heat out to the ocean creating a steam bath and leaving a trail of poached fish along the way isn't really an option.

I'm not certain what you'd do with waste heat, but I have a couple of guesses.

First of all the translation from thermal to mechanical energy should eat up a significant amount of energy, the process is not going to be 100% efficient, obviously. That should still leave a significant amount of heat to deal with. I suppose they could dump it into heat sinks and attempt to carry it with them, which would result in a constantly rising temperature in the interior of the sub. Or they could try something funky like using piezo wafers to further convert pressure to electricity, the problem being what to do with the excess electricity.

Anyone have any ideas?

 

[Brian1968]

In a submarine, stealth is everything, so running the heat out to the ocean creating a steam bath and leaving a trail of poached fish along the way isn't really an option.

[\QUOTE]


Mmmmmm....poached fish.