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Alan this is in the line of my thoughts. From the beginning, for my
purposes of
exploring Lake Superior, I need to cover large areas. Speed and
endurance are
required. This is the reason for me carrying 18- 85amp batteries in
external battery pods.
If I look at the volume of water in a full flood state the drop
weights to compensate
would be much heavier than I would like.
A 6000 lb lift is only the extreme as this can be my overall
weight. Safety is for sure
not to be compromised, my skinny little butt on the line. I am just
thinking this could
be a solution. I don't feel that the hatch breaking the surface to
allow egress is needed
for an emergency situation when there is a surface support craft.
With a full 6000 lb +
lift capability.
Dean
In a message dated 12/3/2009 1:22:13 A.M. Central Standard Time,
alanjames@xtra.co.nz writes:
Hi
Mark,
Re the large ballast tanks, another thought is that the larger they
are
the more drag, & inertia due to them being filled with water
while
submerged. I'm not sure how much of a problem or extra drain on the
batteries this would be. Someone with experience might like to comment
on that.
Alan
----- Original Message -----
From: "F. Marc de
Piolenc" <piolenc@archivale.com>
To: "Personal Submersibles"
<personal_submersibles@psubs.org>
Sent: Thursday, December 03, 2009
7:00 PM
Subject: [PSUBS-MAILIST] Reserve buoyancy
> I've been
silently following the tender/reserve buoyancy discussion. As
> my
primary interest is in salvage rather than sightseeing, I have
>
assumed from the beginning that any sub that I build or am involved in
> building will follow safety criteria more like those of cruising
Naval
> submarines than research subs. But now, reading the report of
the
> salvage of the Alvin by the US Navy, I see that the allowances
for
> research subs are inadequate.
>
> Aluminaut was
selected for the salvage op because she was the most
> autonomous and
robust of the submersibles available. After her first
> dive, when she
spent several hours trying to insert the lifting toggle
> in Alvin's
hatch, she surfaced with her batteries exhausted. It proved
> to be
impossible to recharge her at sea, because the main hatch had to
> be
kept open to allow hydrogen to escape, and when it was left open she
>
shipped water! She had to be towed to sheltered water for repairs and a
> recharge. This is all the more remarkable because Aluminaut is the
most
> seamanlike of all the research submersibles that I've actually
seen.
>
> Battery vented into the crew space? No means of airing
the boat without
> leaving the hatch open? I can understand not
providing a separate
> snorkel or air-induction trunk - this is a deep
diver, and every
> pressure-hull penetration is a potential failure
point - but in that
> case the saddle tanks should have been made
larger and some means of
> fitting a funnel over the main hatch to
prevent water ingress should
> have been provided. And as for venting
the battery into the crew
> compartment, ANY arrangement is preferable
to one that exposes the crew
> to hydrogen, or worse -
chlorine!
>
>
http://www.archive.org/details/recoveryofdeepre00unit
>
> I
assume that reluctance to add saddle tank volume in a personal sub is
>
due to the need to trailer it home. If it exceeds maximum highway specs
> it must obtain a special movement permit every time it hits the
road.
>
> Best,
> Marc
>
>
>
>
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