SubICman wrote:Ok, how much is really being compressed? it is 44 psi per every 100 ft, so 4.4 psi per every 10 ft and .44 psi per every foot (seawater, fresh is .43, pool water would be close to seawater because of the chlorine). You are saying this happens around 10" so the compression is roughly .37 psi, not very much. What kind of foam are you using? Seems to me that it could be an air trap problem and not a compression problem (or maybe a compression of air bubbles problem). Styrofoam cups have to be taken down several hundred feet to be compressed smaller then they started. I have several that were exposed to sea pressure in a torpedo tube near test depth and are the size of a shot glass. I also would look at the area that you are running, neutral bouyancy can be affected by other factors such as density of the water (salt/mineral/chemical content) and temperature of the water (warm water has less ability to support the boat, cold water will support better). I have many a time been on the way to periscope depth in the real thing and have crossed the gradient and either almost stalled out and had to pump to get up or have gotten too light and had to flood to avoid broaching the boat. The funny thing about bouyancy is it acts the same on a 7900 ton submarine or our little 10-15 lb boats I hope this helps a little.
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