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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