In my opinion, one can not say exactly which speed is most effective,
it depends on the transition to be done underwater
I usually use ahead one third
For example type IXc, underwater range is 75 nmi with speed 4 knots,as we know
Type VII 80 nmi with the same speed
To intercept a target or avoid a destroyer attack is another
Last edited by ivanov.ruslan; 04-06-18 at 01:34 AM.
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