Quote:
Originally Posted by MattDizzle
I think the VIIA had problems holding its depth underwater at less than 4 and a half knots
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I would imagine that is "depthkeeping" as in how the boat could precisely it could keep exactly X meters depth. Speed gives the planes something to work with and those are much better at fine control. I would seriously doubt that speed is necessary to prevent totally sinking like a lead anchor in real life unless your engineer severely screwed up the ballast tanks.