A practical question:
what would you expect to be a realistic traverse and elevation speed for manually operated flak and deck guns? Should this speed be slower for twin/quad mountings than for single guns, due to the increased weight?
Those speeds will greatly affect the effectiveness of U-boat guns. Too bad, while there's a lot of information on power driven guns, I couldn't find any reference to manully trained/elevated guns on the web. Nevertheless I am sure that some naval history expert around here ( Sailor Steve are you there?

) will be able to provide a reasonable extimation.