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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 -----
From: Alan James
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.