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Some good ideas Glen,
I like the magnetic release, you could experiment a bit with it
without putting holes in your hull.
A bag of 1 cubic metre dimentions should fold up pretty small. My
tanks are going on the outside &
in that case maybe T off to a solenoid valve to
operate it & only wires will penetrate the hull.
Are you a rugby fan? You're on a roll at the moment.
Alan NZ
----- Original Message -----
Sent: Tuesday, August 11, 2009 7:43
AM
Subject: Re: [PSUBS-MAILIST] Buoy
release
Hi Frank D
How about as a release mechanism using a super magnet inside the hull
thus eliminating the need for an extra through hull a normal fishing yo yo
spool with 160 lb line with an thin elastic band trip an epirb that
switches it self on as it exits its holder and which is connected to a buoy
with a small strobe and on the buoy is clearly written that it is
attached to a psub in distress the thought of getting stuck in soft silt
or mud and because of this not been able to drop your weights has crossed
my mind on the other hand why not take a 1ton lift bag vacuum fold it in a bag
attached to the outside of your hull to one of your lifting eyes with a d
shackle a flexible air pipe from the inside of the bag via a through hull to
your air source inside the hull in other words save yourself.
all the best
Glen SA
----- Original Message -----
Sent: Saturday, August 08, 2009 8:57
PM
Subject: Re: [PSUBS-MAILIST] Buoy
release
I've been thinking of that buoy release Dean mentioned, and I like it.
He proposed a simple turned down wooden closet rod, with fishing line
wrapped around it's turned down middle section, and sealed up so it doesn't
get water logged.
My thought is to use something like that, and have it encased in a two
inch pipe sticking into the hull near the sub's top with a welded
bottom cap. The pipe ( of course ) will be connected to a ball valve and to
release the buoy, just open the ball valve and the buoy will float
up, unspooling the fishing line as it ascends. With a 2 inch pipe/valve
there is enough space to make a buoy a little more sophisticated than just a
closet rod. I was thinking along the lines of a buoy with a light on top,
and maybe an antenna and signal device built in, about the size of a
flashlight. The device can be turned on at the beginning of each dive and
stowed in it's release tube.
Like the dive lights in my dive planes, the batteries will be simple
"D" cells giving me easy access and cheap replacement, and no thru-hulls or
wiring to deal with. Just put fresh "D" cells in there when I dive and turn
them on when launching. If I will be going up and down all day, It's real
easy to just pull the dive lights out of the dive plane "wings", pop in new
batteries, and stuff the dive lights back into the wings. Same with the
buoy. I would expect the batteries in the buoy to last several days, with
just a low power LED for a beacon, and an intermittent signal sending unit.
The fishing line cable will need to be pretty small, but is not used for
leading a grapple hook down so only has to hold on to the buoy and could be
1000 feet long with room to spare. Plus, It's cheap and easy to replace the
line during regular maintenance. Now, I won't be able to reel it in from
inside the sub, but I don't see that as being very necessary, as a buoy
release only happens when you're in serious trouble. Got any thoughts on
this ? Frank D.
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