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Thanks Carsten, valuable research.
I remember Phil describing a system for escaping at
depth, where the dome was hinged on the
inside & straps were attached to the base of
the dome & under the arms of the occupants.
The hinges were removed from the dome & the
hull was flooded. Eventually the dome would lift off
& take the crew member with it, with his head
in the dome breathing it's air.
This system was for escaping at depth where the
nitrogen narcosis would make the occupant
a totally useless drunken jellyfish.
It seems a very complicated issue depending on
the depth. You wouldn't want to flood too fast &
burst your ear drums, but you wouldn't want to
flood so slow that you would get the bends when
you came up.
Regards Alan
----- Original Message -----
Sent: Monday, September 05, 2011 8:13
AM
Subject: Re: [PSUBS-MAILIST] I survived
an escape from a sunken Psub this weekend!
Hi Alan,
you can not open a dome hatch even in relative
shallow water without equliaze the pressure.
The water pressure on the dome will prevent this.
The boat was flooded. But
because of the shallow water just with a relative small amount of water.
The first test we make we
flooded the boat complete with the 2 inch flooded vale open to let the water
in and the 3/4 inch overpressure vale open to let the water out. Only in the
domes was air. The escape was relative soft because it was not so much air
anymore in the boat. But it takes 8-9 minutes to flood the complete boat. And
teh crew is relative dived in the sub.
Than we figure out that you have allways to unlook the dome hatch
before you try to flooded the boat. The simple reason is that you can not open
the dome latches with the boat allready flooded for to reasons: First you have
30 Liters air in the dome create a lot of lift. And if you flood the boat you
have a overpressure in the sub (distance of the compressed air from the
inside water level to the hatch seal) which create also a hell of lift to the
dome latches - about a quader of a ton..
At the end you can not open the dome.
Rule : ALLWAYS unlock the dome you want to exit
before you flood the sub..
If you do that way the dome open automaticly if the pressure on the
o-ring is equilazied by the pressure and the
lift force op the dome itself. In our case it was
just seconds after you open the vale. For this reason we bild out the dome
springs to get less opening force and more time. The normal time than was 1-2
minutes from opening flood vale a both crew get out.
We make a lot of test: But allways sunk the sub to
the ground, than unlook the dome, than flood.
One dome unlook, one looked, water rush in an air
out on the unlooked dome. Pilot goes out there.
After this the second mate open his dome with not so
much lift (only the lift of the air in the dome).
One dome unlook, one looked, water rush in an air out on
the unlooked dome. Pilot goes out there.
Second mate dive under and leave the sub via the open pilot
hatch.
Both dome unlooked, both
open simoutanisly both leave the sub via there own domes, one first the other
after sonme seconds.
My conclusion
is that on a double dome sub it is the
best that only the pilot dome is unlooked. Than flood the sub. Pilot dome
opens and the pilots get all the heavy shower, air rush out, violent sound and
out of vissiblity effect and than he goes out and wait. The guest stays in his
dome -bubble until eyerthuing is silence after some seconds. Than he follow by
the open dome of the pilot or the pilot open his dome from outside to help him
to escape.
We escape without any gear,
with diver mask only, with diver mask and diver bouancy aid, with scuba gear
and with Steinke hoods. We learn a lot of which unit is the best for what
purpose.
01) For a Psub the best unit
ios a diver mask with a old fashion divers bouancy aid. the tyo with a
breathing hose and a small spare air bottle.
02) The Steinke hood works only during a acent to the
surface. If you seat a minutes in a sunken, flooded submarine and without a
bypass air line to the hood - you can not breaze anymore. We feel than 01) is
the better solution. The Steinke hood is may the better solution on really
long escapes.
03) The concluion for
large submarines like Euronaut is than we will rebuild or dry diversuits. In
that way that we install a breathing hose to the suits. In that way we can
breath out of the suits during the way on the surface. And need no dive gear
at all. We conect the inflator hose to the ships emergency breahting hose line
systzen short before we leave the sub.
We learn a lot more from the exercise but anyhow this
letter is allready long.
vbr Carsten
"Alan James"
<alanjames@xtra.co.nz> schrieb:
>
Can you explain what was happening Carsten?
> It looks like you didn't flood the sub at all prior to
opening the hatch.
> I guess that
because you were so shallow there was no pressure on the hatch &
it
> could be opened
easily.
> Can you please do it again at
100 ft
> Regards Alan
>
> -----
Original Message -----
> From:
<MerlinSub@t-online.de>
> To:
<personal_submersibles@psubs.org>
> Sent: Monday, September 05, 2011 6:49
AM
> Subject: [PSUBS-MAILIST] I survived
an escape from a sunken Psub this weekend!
>
>
> Hi submadmans, some of us a little
more crazy than others,
> or more
serious - depents may on the view of the observer.
>
>
http://www.youtube.com/user/CarstenStandfuss#p/a/u/2/jsBCnWZCj7E
>
>
http://www.youtube.com/user/CarstenStandfuss#p/a/u/1/mKe76HRVPSQ
>
>
http://www.youtube.com/user/CarstenStandfuss#p/a/u/0/gtQ3HNuxcGA
>
> We learn a
lot on this weekend.
> And the is now
some serious experience we can share.
>
> vbr Carsten
>
>
>
>
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