Quote:
Originally Posted by Dimitrius07
In flank speed on periscope depth and with periscope up can not only be dangerous but also will be hard to aim due to high vibration.
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The peri of type XXI got an additional supporting stand because during testing with the very first boats they found out that there was heavy vibration on the raised periscope at 6 knots and it could not be used as a "sensor" at all.
The older boats didnīt had such problems because noone was aiming at 6kn. As you know this speed was "Große Fahrt" which was very loud and would have alerted the escort vessels.
But the new elektro-boats could run 6kn even with the motors for silent running (Schleichmotoren).
(So stated in the book
U-Boottyp XXI)