The last few days I've been concerned about a design flaw in my schematic for my rough draft final sub. Boyle's law states when you're absolute pressure doubles your volume is how. My hypothesis is as the submersible is ascending from the depths the volume of the air may expand at a faster rate than my small solenoid valve can release; this would lead to unpredictable behavior, and the loss of vertical control.
As I was trying to sleep at 2 AM it occurred to me that he ballast tank does not need release air being piped through the pressure hall. There is not too much thought put into my original plan concerning this one matter. My internal solenoid valve is capable of holding a difference of 750 psi, however the difference between top of the ballast tank in the open water will be my new, thus allowing for a solenoid that allows more flow. The internal ballast tank had a restricted flow in order to handle the great pressure. The new solenoid valve which will be in the pressure hall itself will not have the same restriction.
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