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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