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Hi Glen,
That 1 ton lift bag would take something like 7000
liters to fill
at our hypothetical 200ft depth.
I don't know how much air the K250 / 350 boats have in there
ballast tanks but I'd assume you would fill those ( X 7 at 200ft) & try
& lift
yourself off the bottom first, & don't forget to leave yourself some
air to
equalize the hull in case you need to escape.
Alan
----- Original Message -----
Sent: Saturday, August 28, 2010 8:47
PM
Subject: Re: [PSUBS-MAILIST] Distress
buoy
If the main purpose for the emergency line
is to pilot a cable to lift the boat,I still think a vacuum packed 1ton or
larger lift bag with a air hose attached to the inside, inflated by the
pilot ,held in place by a square sheet of pvc and velcro to hull could save
the day .In combination with this one could attach sharp blades in stratigic
places .As a last resort a emergency marker could be deployed.I agree with you
Alan that not only is it more logical to attach the hook to the stern to act
opposite to the direction which caused the trouble,but allso winching a boat
attached any other way will put more pressure on the tackle.(like pulling a
fish thats been foul hooked in the side)
Glen
----- Original Message -----
Sent: Friday, August 27, 2010 11:24
PM
Subject: Re: [PSUBS-MAILIST] Distress
buoy
I was thinking that it would be better to put a
release buoy
& lifting eye on the rear of a
sub.
99% of the time you'd be driving forward into
any obstruction,
so if the gear was on the rear there would be
less chance of it being
obstructed also the lifting angle would be
better for pulling you out.
Alan
----- Original Message -----
Sent: Friday, August 27, 2010 11:58
PM
Subject: Re: [PSUBS-MAILIST] Distress
buoy
The advantage is that the arrangement is cheaper and less complex
if the reel carries the line. But looking at Phil's arrangement suggests
that it doesn't have to be. The wire strop through your reel axle seems
pretty simple and cheap, too. Moreover, it's already proven.
The real-reel issue for me is where to put something like this on
Gamma or a Kittredge. Almost anything I do puts the reel and buoys in the
pilot's way. Frank can bury one in his fairings, but the Nektons don't
have any of those. I'll have to cobble something together for a mock-up to
see how best to do it.
Vance
-----Original
Message----- From: ShellyDalg@aol.com To:
personal_submersibles@psubs.org Sent: Thu, Aug 26, 2010 11:26
pm Subject: Re: [PSUBS-MAILIST] Distress buoy
What's the advantage of having the reel travel with the buoy
instead of remaining with the sub and unreeling from there?
Hi JT.
I don't see any advantage in having the reel attached to the buoy
either. It will just add weight and entanglement hazards to the buoy. Good
idea on marking the line to show depth.
Alan: My little sketch didn't show the release mechanism very well.
My thought was to use a spring loaded pin that keeps the latch on the buoy
closed. The "entrapped" pin in the thru-hull would push out the spring
loaded pin in the release mechanism, providing a positive lock on the
buoy. The thru-hull just needs to be a small one. I think a 3/8 inch
nipple would be fine with a 1/4 inch rod trapped inside with "O" rings to
seal.
The valve would only be open for a few seconds to activate the
release.
Magnets might work but you still need a release mechanism of some
sort.
Lots of guys use a small hydraulic hand pump to activate the drop
weight latch. It would be fairly simple to add a valve and line to the
pump to activate the buoy release.
Frank D.
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