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RE: [PSUBS-MAILIST] VBT's & The Apology
PS: If you carefully read action reports, you will note that it was a
miracle that the British accomplished what they did with these submersibles.
An awful lot were lost or prematurely scuttled during ops.
R/Jay
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
A skimmer afloat is but a submarine, so poorly built it will not plunge.
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jay K. Jeffries
Sent: Saturday, May 26, 2007 9:18 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] VBT's & The Apology
The X-Craft used a top hatch and did not maintain a bubble in the diving
chamber.
R/Jay
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
A skimmer afloat is but a submarine, so poorly built it will not plunge.
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of
david@ryma.com.au
Sent: Saturday, May 26, 2007 6:31 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] VBT's & The Apology
Hi Ken
At the risk off offending others, how do you think the Royal Navy with
its midget subs locked out divers to cut torpdo nets in "mid water"
without loosing neutral bouyancy? It can be done, It just depends how
you measure your level of risk
Regards
David
Quoting Ken F <syber_psubber@yahoo.com>:
> Vance,
>
> Wow, I really had no idea that what I was suggesting was so taboo.
> You make it sound as though I violated some oceanic statute just by
> bringing it up. I had tried to stress early on that at 23 I'm a bit
> young, and I realize that, but maybe if you can calmly inform me of
> any really horrible no no noooo's then possibly you can just drop me
> a note or something? Scolding me publicly is hardly a conducive way
> to promote the free flow of information and subject matter in a board
> which is not governed by insurance policies nor commercial
> institutions.
>
> Furthermore... I think that your view of the future of submersible
> use, especially by private contractors, is archaic. Actually, I
> might leave the dinosaurs out of it and just leave it at "outdated".
> I realize that the older crowed here spent alot of time either on the
> surface, or on the bottom, but never in a capacity where a diver
> might need to exit the sub at a spot somwehere BETWEEN the surface
> and the bottom. I'd imagine that I'm a whole new species of human
> who can find extremely usefull ideas for establishing a protocol of
> correct procedure and safety for exiting and reentering a sub while
> in a column of water, and not grounded at the bottom.
> I'm sure there are several possible scenarios for the situation. I
> like to think "outside the bun". It's a nasty habit that tends to get
> me promotions. The more informed I am about several ways I can do
> something, the more contingencies I can come up with when I need to
> make decisions. I'm not sure that limiting myself with conventional
> taboos is necessary.
>
> I also like to be safe though.
>
> Ken
>
>
> vbra676539@aol.com wrote:
> We've been through this. no, No, No, NOOOOOOO!!!!! The boat WILL NOT
> be neutral, or even close to it while a diver is outside. Live
> boating, as moving the sub while the diver is outside is called, is
> strictly forbidden by insurance companies, commerical dive procedures
> and common sense. You build the boat to flood negative in excess of
> the BOTH diver's weights, as your tender may in fact have to get out
> to serve as rescue or back-up diver. Mid-water diving??? Sheesh! Come
> on, guys. Vance
>
>
> -----Original Message-----
> From: ShellyDalg@aol.com
> To: personal_submersibles@psubs.org
> Sent: Fri, 25 May 2007 12:51 am
> Subject: Re: [PSUBS-MAILIST] VBT's
>
> Hi. This is in response to the diver weight compensation question.
> Every dive trip in your sub requires careful measurement of what you
> bring on-board.
> If the dive plan calls for a diver to exit the sub while at depth, I
> would think that it would be better to add buoyancy to cover the
> divers extra weight while on-board, and then dump that buoyancy ( air
> bubble ) when the diver exits the sub, there-by maintaining neutral
> buoyancy while the diver is outside.
> When the diver is back on-board, blow the required amount of air
> back into the trim tank ( a measured amount of water to compensate
> for exactly how much the diver weighs ) and again maintaining neutral
> buoyancy.
> A sub with a diver lock-out function would need a bigger trim tank
> than a sub without that capability.
> Don't forget to calculate how much air the diver displaces with his
> body, as this will figure into the required additional buoyancy too.
> You don't need a separate pump system, nor would that be desirable,
> to let a diver exit and re-enter the sub. The lock-out chamber is
> controlled by air pressure, and any small amount of water that
> remained within would be easily compensated for by the additional
> trim tank volume.
> You WILL need some means of dumping the air from the lock-out
> chamber once the water is blown out and the hatch is closed so the
> diver is once again at one atmosphere. This needs to be monitored
> closely so a diver has time to dump the excess nitrogen absorbed by
> his body tissues and blood. A diver lock-out chamber is really much
> like a de-compression chamber, but is located inside another chamber
> ( the sub's pressure hull ) so a compressor to drive out the
> additional air is required.
> Frank D.
>
>
>
>
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