----- Original Message -----
Sent: Wednesday, January 04, 2006 2:49
PM
Subject: Re: [PSUBS-MAILIST] Compressable
ballast tanks
Hi Rick.
Basically I got the idea for the moving bottom
scuba tank from thinking about how a stick deodorant tube or a woman's
lipstick tube works.
Thinking about how the bottom moves up as you use
them. But after I wrote that post I started thinking
that the water pressure wouldn't automatically
move the bottom upwards because there would still be too much pressure in the
tank
even with it appraoching empty for the water
pressure to move the bottom upwards without some sort of mechanical
device or hydraulic device to force the bottom
upwards like a woman's lipstick tube will not raise unless the bottom is
cranked
mechanically . It was a scuba tank idea I had
that I wrote about without totally thinking it
thru. Oh well, at least it might
work for ballast tanks even though it wouldn't be
practical for a scuba tank. Like you said, one of those napkin sketch
thoughts over coffee,
sometimes they are good ideas, sometimes
not. Plenty of napkins though. Grin.
Bill Akins.
----- Original Message -----
Sent: Wednesday, January 04, 2006 1:11
PM
Subject: Re: [PSUBS-MAILIST]
Compressable ballast tanks
Hi, Bill - great idea around the napkins and
backs of envelopes while drinking coffee at O'dark thirty with your psubbing
friends ;-)
Myself, weeeeeellllll. When diving (I use
steel twin 50's) and my tamks empty and become lighter, I just let air
out of my suit. No other devices needed.
In a sub I'd like to keep it simple. When
the tanks empty, I'll be bleeding off some of the air in my hard
tank.
Rick L
Vancouver