Quote:
Originally Posted by ABBAFAN
Returning to the point in hand, I meant that blowing ballast deep will lead to the air in the ballast tanks expanding and pushing more water out as the boat rises won't it? Is there a way they compensate for this?
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Correct. As you go shallower the water pressure decreases allowing more of it to be discharged from the ballast tanks by the higher pressure air. As more water is expelled from the tanks the air pressure will drop as it has more room to expand. As far as compensation is concerned, yes they could open the MBT vents to vent some of that air. But the $100K question is WHY would they want to do that? Like I stated before if you merely wanted to change depth you use your planes to proceed to the new depth. You don't blow ballast to go to a shallower depth.