Pierre,
As much as you may want to, it's almost impossible to build a small home
built P-SUB to meet all the specifications called for in ABS, PVHO, the
Coast Guard and the like. Try your best to meet as many of their
requirements and look very closely at the ones you can't meet. Some of the
regulations aren't a must for the way we will be using our small subs.
( I except a bunch of flask to this message, but it's reality.)
My tiny K-350 is a world apart from Alvin and other small subs of it's kind.
My sub won't hold a candle to it as far as it's capabilities and uses and
can't be expected to hold a candle to it in safety features either.
Please don't get me wrong. I am VERY safety conscious, but if I'm putting
around in my little yellow toy at the bottom of a lake with a maximum dept
of 60 feet, I'm not to concerned about a three day life support system.
Heck, if I'm not home for supper, my wife will have the divers and a tow
truck there to drag me out before the dinner gets cold.
Seriously, with a dive plan, my surface support people will have the dive
rescue in the water in no more then an hours in any lakes in my area. When
I dive somewhere else, I'll surely outfit my sub accordingly.
Plan safe, build safe, dive safe but don't get to hung up on standards that
you don't need to be concerned with.
If you won't be in a body of water that ever gets swells over a foot, is
three feet of freeboard really required?
On another note. You mentioned that you have 800 pounds of drop weight.
That's a LOT OF WEIGHT! If you let 800 pounds drop all at once you'll break
the surface like a SAM missile! I hope you plan to drop in stages as you
require.
I don't know why a drop weight wouldn't be a secondary ballast release. It
would get you positive buoyant.
Dan H.
----- Original Message -----
From: "Pierre Poulin" <pipo305@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, May 06, 2004 1:03 PM
Subject: RE: [PSUBS-MAILIST] ABS - 3/17.1.1 - Normal Ballast System
Is drop-weight a method to deballast?
It certainly don't require electricity!
Pierre
From: "Marten Liebster" <mliebster@tbteam.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: RE: [PSUBS-MAILIST] ABS - 3/17.1.1 - Normal Ballast System
Date: Thu, 6 May 2004 12:12:43 -0400
Apparently my smiley didn't have the intended effect. I received, what I
consider to be, a semi-nasty direct email and now this posting.
It is because I respect for the knowledge contained by those here that I
ask
such questions. I'm not demanding respect since I've read through several
chapters of a handbook. Respect given to a person is attained by what EF
Hutton used to say on their commercials, by earning it.
I know that I'm a newbie. I know that there are many things that I don't
know. I am very humble in regards to my sub (and many other fields as
well)
knowledge. But as far as I can tell this is the best place to ask
specific
questions to ones who have that knowledge. In fact the About Us page on
psubs.org says "PSUBS.ORG was organized to promote and encourage the
discussion, designing, building, certifiying, owning and use of personal
submersibles".
I hope that I can garner some respect for my desire to learn and to
safely
and properly build a psub. Perhaps over the years I will be able to gain
some respect as a submariner.
Back to my original post:
How do you deballast? & Do you have two independent means of doing this?
By seeing how others are doing this, I learn. If someone successfully is
using a similar method to my design, then that's some confirmation of my
design and progress. Obviously my design would still need to be tested.
If
someone uses a method that I couldn't conceive of, I learn about that and
see if it would work better.
I hope I have clarified myself and explained my method of madness!
Marten
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Pierre Poulin
Sent: Thursday, May 06, 2004 11:44 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] ABS - 3/17.1.1 - Normal Ballast System
Marten, I'm sorry to say that respect don't come by reading a book...
But you still have my respect anyway!
Pierre
From: "Marten Liebster" <mliebster@tbteam.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST] ABS - 3/17.1.1 - Normal Ballast System
Date: Thu, 6 May 2004 10:23:51 -0400
Gentlemen and scholars,
Quoting ABS handbook in section 3/17.1.1 (Normal Ballast System):
"Each manned unit is to be fitted with a ballast system capable of
providing normal ascent and descent and necessary trim adjustments.
Ballast tanks that are subjected to internal or external pressure are
to comply with the requirements of Section 6. Two independent means of
deballasting are to be provided; one is to be operable with no electric
power available."
In my initial designs I have only accommodated for 1 means of
deballasting, using valves and compressed air. I assume this is the way
most psubs are set-up.
How do you deballast?
Do you have two independent means of doing this?
Thanks for info
Marten "the ever-curious" Liebster
PS Hopefully I'll start getting some respect - as I have started to
read through the ABS book :-)
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