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Re: [PSUBS-MAILIST] Thought experiment



Vance, Frank thanx for the replies.  I guess I wasn't clear in describing the ascent phase using pos. bouyancy as "negative gravity" so that propulsion would be achieved on both descent and ascent.  I think Karl Stanley's sub (from what I could gather from the website) ballasted down to descend and provide propulsion then used air to ascend, which is what I'm trying to avoid.  Will check out your leads, Vance.
Thanx again
PR

vbra676539@aol.com wrote:
No questions. Have a look at Will Forman's Deep Voyager, designed in the 60s around spherical glass pressure hulls. He did the study for Tap Pryor who wondered if something could be built to run between Hawaii and California without refueling. Three man, seventy feet long and a working depth of 20,000 feet is what they came up with. Will wrote a novel featuring the sub, too. I've got it on file somewhere, downloaded but unread. I really do need to catch up on this stuff.
Vance


-----Original Message-----
From: Philip Ridenauer <akula151@yahoo.com>
To: personal_submersibles@psubs.org
Sent: Sun, 15 Jul 2007 4:47 pm
Subject: [PSUBS-MAILIST] Thought experiment

I've been running a thought experiment in my head for an ambient dry glider (though I suppose a 1atm sub could do the same).  The idea is to have the sub ballasted negatively and use gravity as the propulsion source.  At max depth (depending upon how much pressure the pilot was willing to risk/withstand) enough ballast is expelled to provide positive bouyancy.  The ballast taken on and expelled should be forward of the CG to provide nose down attitude at neg. bouyancy and nose up at pos.
Query:  is there a means of expelling ballast water mechanically so that one does not have to carry an inordinate amount of compressed air to achieve this effect?
I have an idea for a suspended weight acting as a piston but don't know if this is feasible.
Just toying with an idea.
PR
ps  My computer and server are sloooow, so I don't ck my email every day.  It might take me a while to reply to any questions.­
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