Re: [PSUBS-MAILIST] inaccurate terms & inescapable that the Hunley was a hybrid.

[Jim Pesanka <jpesanka@yahoo.com>]

Please correct me if I'm wrong:

 

In a 1-ATM sub, the pressure inside the hull is about the same as it is on the surface, give or take minor variables of the type already described.

 

In an Ambient sub, the pressure inside the hull is about the same as the outside water pressure at any given depth, more or less.

 

So it seems to me the Hunley was basically a 1-ATM sub (with a pressure hull) that might have had some of those "minor variables" in pressure due to the open ballast tank design. 

 

If the atmosphere were at ambient pressure inside the hull,  wouldn't the crew have been able to open the hatch and escape?   That's something three perished crews were apparently unable to do.   And that's why, to me, the Hunley seems much closer to being a 1-ATM sub than it does an Ambient sub. 

 

Does this make sense to anyone? 

 

Jim

 

 

Ian Roxborough <irox@ix.netcom.com> wrote:

On Mon, 13 Jun 2005 02:29:36 -0400
"Akins" wrote:
> 1. An ambient sub allows water to enter its INTERIOR to dive.
> The Hunley did this with her open top and open to the hull
> interior ballast tanks.

This is wrong, any sub which has VBT inside the pressure hull could
meet this discription. And you you could build an ambient sub which
doesn't let water into it's interior, so this seems irrelavent.

> 2. The water pressure entering the sub's interior when an ambient
> sub dives, compresses the atmosphere in the sub's interior just
> as it did with the Hunley.

Yes, there would be a minor internal pressure increase from venting
the tanks. (Also note water does NOT have to enter an ambient sub's
interior for it to dive.)

> 3. An ambient sub uses air to force water out of the sub's INTERIOR
> to surface, just as they did with the Hunley.

I don't believe this for a minute. How did they use air to force water
out? Sailers breaking wind maybe? The bits about the Hunley's operation
I've read about claim that they used a HAND PUMP to empty the ballast tanks.

Well there you go, you got 1 out 3.

There where a few other error in your text , but I can't bothered
point them out at this point - most of them have been address in my
other emails, as have most of your questions.

I'm sorry you don't understand the ambient vs 1ATM, and I'm sorry I can't
explain it in a way you can understand. But I don't want to continue this
exchange, I feel like I'm banging my head on a brick wall. Maybe somebody
else has some way of putting that's better.

Some of your claims of what I've said and defined are VERY inaccurate
(in fact the complete opposite of what I said), this is not very nice.

I will not respond to any more of these "Hunley is ambient/hybrid" emails.

Ian.




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