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----- Original Message -----
Sent: Wednesday, September 01, 2010 8:48
PM
Subject: Re: [PSUBS-MAILIST] Safety
Hook
Sorry, inner tube.
Alan
----- Original Message -----
Sent: Thursday, September 02, 2010 4:40
AM
Subject: Re: [PSUBS-MAILIST] Safety
Hook
Hi Alan
Tire or tube?
Glen
----- Original Message -----
Sent: Tuesday, August 31, 2010 10:32
PM
Subject: Re: [PSUBS-MAILIST] Safety
Hook
Hi Glen,
I used to have a small inflatable, that was
two sections of tractor tire joined together
& covered with a vinyl material. It was
very strong.
The advantage of a tractor tire would be that
it could handle being over inflated by quite a margin,
if you put too much gas in at depth. You
wouldn't need an over expansion valve. Also probably
cheap & readily available.
How's your pet Lion doing?
Alan
----- Original Message -----
Sent: Wednesday, September 01, 2010
3:58 AM
Subject: Re: [PSUBS-MAILIST] Safety
Hook
Hi Alan
Making a standard lift bag is simple and
quite cheap but,to manufacture a strong pillow bag with a pressure
relief valve....... couldn't be that hard ,just think how flat it could
be sucked and you could catch a tan on it while you waited for
rescue.Tractor tires? NZ is just one big farm.
Glen
----- Original Message -----
Sent: Tuesday, August 31, 2010
11:08 AM
Subject: Re: [PSUBS-MAILIST]
Safety Hook
Hi Glen,
what about an enclosed bag with pressure
relief valves on the bottom?
As you'll know the last 33 ft the bag
will double in size & lifting ability,
so if you put it on the surface you'll
get the maximum out of the air you
put in it. You could modify a tractor
tire; that would have the potential to
expand if necessary & with a base on
it, it would be an inflatable boat
waiting for you if you needed to escape.
Just brain storming here.
The Aussies might dump their coach, he's
a Kiwi.
Alan
----- Original Message -----
Sent: Tuesday, August 31, 2010
8:35 PM
Subject: Re: [PSUBS-MAILIST]
Safety Hook
Hi Alan
In experience as a commercial
diver using ' unmaned 'standard lift bags, when they hit
the surface they do so like a rocket loose there form and sometimes
the item you where lifting comes hurtling back in your
direction.This is the reason for a controlled ascend and not letting
the bag exit the water until its been established that self rescue
is not possible .With no weight it could allso be blown over by the wind and loose
form iniatialy when it reaches the surface,but with the right
construction and say a 5kg lead ball (like the ones they use on down
riggers)attached to the bottom, bright orange with a couple of
reflective flashes and instructions attached to it .Once let to the
surface it would be seen for miles.
Glen
----- Original Message -----
Sent: Monday, August 30, 2010
10:40 PM
Subject: Re: [PSUBS-MAILIST]
Safety Hook
Hi Glen,
You could just let the lift bag spool
until it stopped & then wind it
back down. Put in just enough air to
have it fully inflated by the time
it reached the surface. A colorful 1
ton lift bag would certainly stand
out more than a small buoy &
possibly take up a similar space when
deflated.It was noted that your lift
bag idea was ratified by Phil.
Regards Alan
----- Original Message -----
Sent: Tuesday, August 31,
2010 2:09 AM
Subject: Re:
[PSUBS-MAILIST] Safety Hook
If a hand operated winch
spool filled with Spectra, marked for different
depths and controllable feed by pilot ,attached to
the end is lift bag ,not much air would be needed to fill bag as
the pilot could place the lift bag closer to surface, once free
from bottom pilot could winch himself to surface by hand.If he
is unable to free himself from bottom he can release the bag all
the way to surface to act as marker
stress Buoy ect
Glen
----- Original Message -----
Sent: Monday, August 30,
2010 11:47 AM
Subject: Re:
[PSUBS-MAILIST] Safety Hook
To offset the catenary, HBOI did a series
of tests running upstream slightly. This did not straighten
the curve, but rather moved it to a more vertical position at
the sub and tensioned the whole length so that the rescue
device had a better chance to get down. It worked.
Phil's suggestion of carrying enough Spectra to provide
both a marker and a lift line is certainly worth our
attention. That stuff (Spectra) is fearsome strong, and would
do away with almost all of this extra hardware. The big buoy
or lift bag would provide a further lift ability and if
necessary could be released to the surface. Wrap the Spectra
around a cat head and haul away.
Vance
-----Original
Message----- From: glen brown
<gbrown091@gmail.com> To:
personal_submersibles@psubs.org Sent: Mon, Aug 30, 2010
3:58 am Subject: Re: [PSUBS-MAILIST] Safety Hook
Frank
Dont forget to take in consideration the bow effect(in
deeper water) that any current will have on the
rescue cable . The hook will have to be very
heavy otherwise it will be useless in stronger current.
Glen
----- Original Message -----
Sent: Monday, August
30, 2010 12:05 AM
Subject: Re:
[PSUBS-MAILIST] Safety Hook
Hi Frank, Looks good.
You could spring load your device by putting a rubber O
ring in a grove round
the outside of the prongs, if it were necessary.
The lifting eye would be vertical when the emergency
line was tightened
providing the line from the drum was above the lifting
eye.
I googled round a bit trying to find something "off the
shelf" that would work but no
success so far. It's a big world, there's bound to be
something out there.
Alan
----- Original Message -----
Sent: Monday, August
30, 2010 2:33 AM
Subject: Re:
[PSUBS-MAILIST] Safety Hook
Here's a little sketch on an idea I had for a simple
hook to follow the buoy line down. It's much like Phil's
idea, but I'm using the lifting eyes I have welded to my
sub. With a "three prong" approach, ONE of those damn
things ought to grab.
It would operate like a fish hook where the support
crew would keep "jigging" the hook up and down until it
grabbed.
Any comments ?
Frank D.
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