Carbon fiber is not the same as fiberglass. I believe they pressure
tested the vessel to ~~ 6,200 PSI (roughly 14,000' depth).
That said, if something goes wrong at that kind of pressure (~~ 5,400
PSI), the failure would be measured in milliseconds.
bp
<part15sbs{at}gmail{dot}com>
On 6/22/2023 8:34 AM, Chuck McCown via AF wrote:
Water pressure at 12,500' is something like 5400 psi. There is a lot
of area on that tube. Who trusts essentially fiberglass to withstand
5400 psi? If it was a pressure vessel it is one thing, but this is
essentially a vacuum inside the tube, the forces pushing on it are not
pulling on those fibers. The tiniest non symmetry in shape would be
no bueno.
-----Original Message----- From: dmmoff...@gmail.com
Sent: Thursday, June 22, 2023 7:02 AM
To: 'AnimalFarm Microwave Users Group'
Cc: ch...@go-mtc.com
Subject: RE: [AFMUG] This thing on?
I read a commentary today saying the hull was made of titanium and carbon
fiber.
An Operations Director for the manufacturer delivered a quality control
report saying that the carbon fiber hull carried a risk of small defects
expanding into major failures under pressure. They were relying on an
acoustic fault detection system that was supposed to alert the pilot if
there were sounds indicating stress in the hull. That Operations
Director
said you'd have a matter of milliseconds between that alert system
going off
and a catastrophic failure. He'd expressed those concerns verbally
and was
ignored, so he delivered that report to senior management in 2018 to
create
a written record of his concerns, and was immediately fired. Then he
took
his report to OSHA, there was a lawsuit about divulging company
information
or some such. Lawsuit settled later that year, OSHA didn't take any
action
against the manufacturer. I'd bet a nickel that OSHA doesn't have
specific
rules for submarines, and without any rules to follow they don't have
enough
knowledge to assess whether one is actually safe.
-----Original Message-----
From: AF <af-boun...@af.afmug.com> On Behalf Of Chuck McCown via AF
Sent: Wednesday, June 21, 2023 7:32 PM
To: AnimalFarm Microwave Users Group <af@af.afmug.com>
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] This thing on?
What a horror show. There were so many ways they could have improved
their
chances at survival. Supposedly dissolvable straps should have
dropped sand
ballast by now. They had a way to mechanically drop steel ballast.
And a
inflatable bladder.
Why not a power and comm tether to the mother ship? I realize it is
12,500'
of cable but fiber optics are pretty much neutrally buoyant.
But no underwater pinger. No ELT. How about a sat tel or VHF radio.
Some
kind of way to talk to the world. No high pressure air to blow tanks. I
would have wanted explosive bolts on the hatch if there was no other
way to
get out. But why not some kind of fresh air intake assuming you could
surface. This haunts my sleep.
-----Original Message-----
From: Bill Prince
Tryin' to get my ass outa this cramped submarine.
bp
<part15sbs{at}gmail{dot}com>
On 6/21/2023 3:10 PM, Steve Jones wrote:
Errbody dead?
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