Quote:
Originally Posted by Gargamel
Depends which engine.
If you only have your port engine, you can't recharge the batteries, and your current charge is all you got, so conserve.
If you only have your port, you can't be underway and charge at the same time. So you have to sit motionless on the surface while you wait for your battery to charge.
That, and it starts pulling to the left 
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True, though at least on the surface you can still have propulsion with a single engine. Was recently reading that Donitz had the idea to add a third diesel to the VII, increase the length and beam a bit to accomodate for massive amount of engine failures that caused entire patrols to be aborted due to the plague of chronic engine problems; like nearly all good ideas it was turned down.