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There should be little to no upward force since there will be negligible change to internal air pressure. Since the sub is essentially sealed, it’s not like the internal air is rushing to get out as would be the case of an ambient sub.
Al
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
Hi all, I've brought up this subject before, but are tackling it from a differant angle. How much pressure is exerted upward on a hatch at the moment where the submarine just submerges below the water? This is the point of most force before external water pressure helps close it. If you took your submarine, filled it with water & hung it upside down, would this be the same amount of force, or close to it. In wich case if you have a design like Franks flying saucer that angles up to the hatch, you'd have a lot more force acting upward on the hatch than a K250 where the lifting force would be spread more evenly along the hull. Am I thinking right? Alan
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