Brent,
There were
several subs prior to Lake’s Argonaut
with lock-out capability: Alligator
(which NOAA and the US Navy have mounted an expedition to find), a post-Civil
War submersible (forgot the name) that ended up in Panama pearl diving and the
remains recently found on a beach there, and a Spanish sub that was way ahead
of it’s time (restrained by the art of material science at the time).
R/J2
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
It is the mark of an educated mind to be able to
entertain a thought without accepting it.
- Aristotle
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]
On Behalf Of Brent Hartwig
Sent: Saturday, January 27, 2007
11:28 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Perry
lockout
Hello
Frank,
I
would venture to guess that the Simon
Lakes Argonaut I was the
first real submarine to have a diver lockout chamber where by you can open a
bottom hatch and jump in. The link to a picture of the Argonaut I shows a
downward opening hatch for the DLO.
Even
the Pitch Pine Submarine as the wooden prototype Argonaut Jr. was called. had a
bottom diving hatch. Here is a page from Simon Lakes book call "The
Submarine History of Simon Lake" I would guess that the Argonaut Jr
was a ambient sub when the divers hatch was open as well as the rest of the
time since the shape and material are not that conducive to 1 ATM
operations.
The
Kraka has this same basic set up in regards to the bottom hatch opening down
and into the water, with a short rope to pull the hatch closed enough so it can
be latched. Peter must of tested and planned for all his internal systems
to be ok with the extra internal pressure it would take to pressurize the
interior of Kraka so the bottom hatch could be opened and the water stay out of
the sub. It's far easier to have the sub be ok with internal pressure
on hatches, view ports, and the like if you only do it at depth. That
way the sub is acting as a ambient sub while the divers bottom hatch
is opened. Then you have to bleed off the extra pressure as you
assend to the surface, either by leaving the bottom hatch open or valves and
let the sub interior act as if it was a soft ballast tank, or use high
volume pop off valves or use a high pressure air pump to return the interior of
the sub to 1 ATM at depth.
The
Euronaut on the other hand has a rotating hatch head that engages with what
looks like eight dogs, and opens into the DLO. That's the only hatch in
that bottom trunk unless he has another one below that opening down and into
the water that I don't see, but I don't think there is a second hatch, so the
seal on the rotating hatch in the floor would need the be tight and the eight
dogs be able to with stand allot of pressure. Here is the picture of this
hatch.
I've
seen a stress analysis Carsten did on that hatch and so I'm sure he's
worked it all out. Perhaps he will comment on this. Here is the link showing
the stress analysis of the divers bottom hatch translated into
English.
Amateurs built the Ark.
Professionals built
the Titanic.
Regards Brent
From: ShellyDalg@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Perry lockout
Date: Sat, 27 Jan 2007 19:56:59 EST
Hello Brent. I've been following your
thread and it sounds pretty interesting.
With a diver lockout hatch, could a guy
pressurize the chamber, open the hatch, and reach out and grab stuff off the
bottom? The hatch would probably need to open inward, and be VERY strong, but
you may be able to get an old ship's bell, or some other memento of your dive.
Might be fun!.....Frank D.
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