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Need advice on free flooding tanks !

Old 09-10-2010, 01:14 PM
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Default Need advice on free flooding tanks !

Without pumping in water, does anybody have experience on the most efficient orientation or position of 2-4 HOLES of approximately 1/8 inch ( for a half foot long ballast tank) for best FREE flooding from water pressure of 1-2 feet ?
Old 09-10-2010, 02:26 PM
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Default RE: Need advice on free flooding tanks !

I install them right down the keel or lowest point of the hull.

Dave
Old 09-10-2010, 02:50 PM
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Default RE: Need advice on free flooding tanks !

I'm curious. Is this an honest to goodness ballast tank with a vent valve on top?

Skip Asay
Old 09-10-2010, 05:21 PM
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Default RE: Need advice on free flooding tanks !

In my scenario, the ballast has already been fixed. Choices are only locations and size of the fixed holes and no operating vent valves neither.
Old 09-10-2010, 05:52 PM
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Default RE: Need advice on free flooding tanks !


ORIGINAL: pl_09

In my scenario, the ballast has already been fixed. Choices are only locations and size of the fixed holes and no operating vent valves neither.

I'm confused. Could you possibly let us in on just exactly what you're doing? Or trying to do?

Skip Asay
Old 09-10-2010, 06:25 PM
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Default RE: Need advice on free flooding tanks !

I am working on a very tiny scale static diving submarine. On bouyancy testing, I am allowed to intall just one single-direction-outward pump, leaving the tank to ' free flooding ' without valves on dives. Pumping water out is no problem even with open holes without valves. I then found out it is NOT that easy to ' drown' a submarine! The big bubbles are so resilent ( like beach balls) and just won't escape without a fight.
Old 09-11-2010, 10:09 AM
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Default RE: Need advice on free flooding tanks !

Ya those pesky bubbles are a pain some times but once you figure out the best way to get rid of them there history.I would think that your pump would have to be working alot to keep the sub afloat and drasticly shorten the run time?

Dave

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