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My weight now is 5600, with up to 6000 with additions to be
done.
I don't really figure to lose all four, I agree seems like
stretching reality.
It isn't just the 500lbs. Right now I am at at 200 max, any
additional lead
would mean the equivalent in syntactic foam hehhe oh to have a
little longer
pressure pod to begin with. PPPPPPP (prior, proper, planning
prevents piss poor
performance.
As far as stability if dropped, I am in good shape. All those
batteries slung as close as
I could get them, really did the trick. If I keep the foam higher
this should not be a
problem.
Dean
In a message dated 12/3/2009 2:58:55 P.M. Central Standard Time,
vbra676539@aol.com writes:
What's your all up weight for the sub? Gross payload? Net? And just out
of curiosity, how would you figure to lose not one but three of your four
pressure vessels? Seems like somewhere in there your statistical probabilities
get down to vanishingly small and its time to take your best guess. Mind you,
600# isn't all that much for a biggish vehicle. We carried 900, as I said, and
when the pods got bigger, Perry quit taking the payload penalty and made the
pods jettisonable. HBOI built a releasable science package for the 1204 which
actually attached to the drop weight tray so they could get some use from the
negative payload requirement and still use it to release in case of a flooded
pod. That said, if your various chambers are interconnected, then I could see
where you would want to figure it all together. That's what bulkhead
penetrators are for--the separation of church and state, so to speak. I'm
beginning to see more use for the deflated and packaged hypalon tubes.
Vance
-----Original
Message----- From: Recon1st@aol.com To:
personal_submersibles@psubs.org Sent: Thu, Dec 3, 2009 2:56 pm Subject:
Re: [PSUBS-MAILIST] Reserve buoyancy
Vance great to see someone else come up with the same numbers. I
have the same but
I have two battery pods. So now I am at 500lbs. Now also include
an electronic pod and my
motor pod. This brings me over 600. Just seems like to much for a
drop weight.
The two battery pods are linked together with cross over pipes
and the pods are tied to the
other pods. Given the battery pods have thru hulls sealing the
others, so all should not flood
but just calculating for worst case.
Dean
In a message dated 12/3/2009 12:47:27 P.M. Central Standard Time, vbra676539@aol.com writes:
Dean,
Why would your drop weight be so big? A 12" pod X 120" is roughly 7.85
cubic feet of volume which would displace about 500 pounds. Your
internal volume (figuring schedule 40ish) would be about 6.9 cubic feet. If
the battery pack is 6X8" in cross section and 108" long, that's 3 cubic
feet. Subtract that from the internal volume of the pod and you've got just
under 4 cubic feet of free space or 250# of seawater on a bad day. So, a
250# dropweight would equalize your trim for a flooded pod and your
normal trim and fairwater system would get you home. Yes? No?
Vance
-----Original
Message----- From: Recon1st@aol.comTo: personal_submersibles@psubs.orgSent:
Thu, Dec 3, 2009 12:02 pm Subject: Re: [PSUBS-MAILIST] Reserve
buoyancy
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
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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