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In a message dated 12/6/2006 4:26:36 A.M. Pacific Standard Time,
vbra676539@aol.com writes:
The oil inside is transferable payload if you will, and it is transferred payload outside. It displaces whatever volume of water there is to match the amount you pumped out there. Being lighter, it wants to lift. And being hooked to the sub in a bag, that lift is imparted to the vehicle--simple. However, it only gives you a little over 1 pound of lift per gallon in seawater. In comparison, that same gallon of seawater weighs 8 pounds and if you pumped IT overboard, or blew it from a hard tank, then (with the same effort) you'd have 8 pounds less weight aboard without changing volume, thus getting lighter! quicker, cheaper, easier and more efficiently. Thus the question, why use oil? Hi Vance.
There is some confusion here, maybe on my part.... The volume of
oil/water or whatever being pumped to the outside of the sub INCREASES buoyancy
because it's volume and weight inside the sub is replaced with air, which
is much lighter than water or oil. So pumping seawater outside gives
you increased buoyancy on the sub by the same weight of the water pumped
out. Makes NO difference if it is pumped into the blue abyss or a bladder
of some sort, the sub will increase in floatation. You may call it getting
lighter... another way of saying not as heavy. Are you really getting
rid of weight or taking on more empty space? Oil pumped
out will accomplish the same thing provided it IS captured in a
bladder. You still increase the airspace inside, thus
floatation. The internal volume change is the same weather
oil or water is pumped out. Pumping oil out and NOT trapping it in a
bladder will not cause as much increase in buoyancy because you are not
transferring as much weight-per-volume outside. If you trap the oil in a
bladder, then it is the same as pumping the same amount of seawater overboard,
because the lesser weight of the oil transferred is made up by the added
floatation of the oil trapped in the bladder. Clear as mud?
A bladder with air will certainly increase buoyancy by the same amount of
the seawater it replaces. Still is not a good idea because the bladder, by
definition, is ambient, and with air, will be vary, depending on depth, making
neutral buoyancy very difficult.
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