did you look to see the difference between Tanks
The size of the Ballest tanks and the sub are very differn't from the US to German Boat's.
The German boat displacment was much less than the US sub's so it took less water in the tank's to start going down. Also because the German sub's had less room the Airtank's were smaller so if there was too much water to pump out of the tank's Air got used up very fast and took time to replenish.
Wasn't the dive plane's on the German sub's also lower to or under the water line to give better dive control?
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