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Re: [PSUBS-MAILIST] Pressure Hulls
Dewey,
Thanks for that. With your more detailed explanation it all makes
makes much better sense.
Am wondering though, if you are up to date with current ROV technology
as now being employed on a everyday basis in the offshore oil industry
at depths up to 10,000 feet.
21 day missions also look very ambitious, especially in terms of life
support requirements and power. Power would also be an even bigger
problem if you are planning on a self contained vessel without surface
support, leaving from and returning to port under the subs own power.
I assume from your foundation's name it will be focused on deep water
marine archaeology. There is certainly much potential in that area.
Would be interest to hear more about what you plan to do.
Walter Starck
Golden Dolphin Video CD Magazine
www.goldendolphin.com
----- Original Message -----
From: "Dewey Mason" <drmason2001@yahoo.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, July 02, 2002 2:52 PM
Subject: Re: [PSUBS-MAILIST] Pressure Hulls
> Hi Walter,
> I will address each comment in turn.
> Here's for the first.
>
> Actually a 9' sphere is about minimum for our
> purposes, due to the extended nature of the cruises we
> intend to be undertaking (21 days+/-). We currently
> are looking at getting 3 such spheres for one vessel,
> and hope to find two more from the same source. This
> would allow a bit of space for all equipment to be on
> board, and still have room for people. We are looking
> at a crew of 4-6. And yes, I DO realize the food
> stores, ect. needed for that long a stay at sea with
> said crew. Like I said, we need the room inside the
> hull.
> As to handling equipment, and a mother ship, we
> will need neither at sea. The vessel is slated to be
> totally self supporting. A true D.E. submarine, with
> complete diving independence. Sail her out, do your
> work below, surface and sail home.
>
> On to the second......
>
>
>
> The concept of a "manned ROV" is used to point out
> that she will not be operated like a sub, with many
> though hull connections and plumbing. Instead, we are
> planning to use multi-plex controls to systems housed
> outside, such as thrusters and manipulators. Thus we
> put the boat on station, it holds position with a
> bottom oriented DPS, and work is done by the
> manipulators on an external platform.
> As to why not use a regular ROV? Well now, lets
> make a list:
>
> -Big ass waves kill cables and ROVs, and quick. The
> sea is not a quiet, easy going place at it's surface,
> but a high energy caldron.
>
> -Days lost to weather cost a bundle, like $15-$30k per
> day. Most crews loose a day in 5 or more to weather,
> in season, and just can't go out, out of season.
>
> -On the end of a 20,000' cable, no matter how good you
> are, you do not know exactly where the hell the thing
> is on the bottom, so what you "FIND" is still lost,
> with only a general proximity of a mile or two.
> Relocation can take hours to days, and you would be
> amazed at what happens when the thing hits the bottom,
> or something you nor it could see, due to a lack of on
> board space and power for a GOOD nav sonar array.
>
> -ROVs are unstable work platforms, period.
>
> -All things towed are VERY slow (back to the increase
> in daily ops cost per area searched).
>
> -As you pointed out, the extra million bucks for a
> mother ship, and the 20 grand a day ops cost for a
> crew of 20-40 to run her and all that expensive
> lifting gear.
>
> There are many reasons for the chose to use a sub,
> and we have been kicking it around for 3 years without
> it seeming a bad idea. And that is with us going
> through half a dozen new people, and 500-700 hours of
> research into current techniques.
> If you are interested, I would love to tell one
> more person what we are planning in detail, but only
> if you have an open mind, and nothing to prove.
> We welcome anyone with those pre-rec's to give us
> new input at anytime. We are even trying to find an
> advisory board of just such folks. Sounds like you
> might have something to offer there, if you would like
> to jump on board.
>
>
>
>
>
>
> =====
> Dewey R. Mason II
> The Deep Past Foundation
> deeppastfoundation@yahoo.com
>
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