How does Carsten get to ¼ ton? That is 250 litres. Is that correct? Wouldn’t it depend on depth as to how much air you have in the sub. The shallower, the more air, the more lift. It should only be the projected area of the dome seal to the water level plus the dome volume minus the dome weight. I am not disputing Carsten’s figures as he mentions water level but just asking if there is any agreement on how it is calculated ? The rule of unlocking before flooding is the most important. As Alan says an Ambient would pose a problem. Hugh. From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James After Carsten's posts on his submarine escape practice it occurred to me that it would be very difficult to escape from an ambient submarine. >>> First you have 30 Liters air in the dome create a lot of lift. And if you flood the boat you have a overpressure in the sub (distance of the compressed air from the inside water level to the hatch seal) which create also a hell of lift to the dome latches - about a quader of a ton.. So if you set your ambient equalization system half way up your hull, everything above that point would see internal pressure. To visualize the pressure, imagine suspending your submarine upside down & filling it half way with water. That water pressure on the hatch would be the same as the air pressure on the hatch in an ambient sub. There is no opportunity to unlock the dome before you flood the sub as in a 1atm. Maybe a screw down type hatch closure would work. Perhaps an outlet valve at the top of the hull to release the pressure to the dome level, to reduce a bit of pressure on the hatch. Any thoughts, comments? Regards Alan
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