Guten Abend, Reverie,
You'll go far in the Kriegsmarine with this attention to detail! But I'm curious about one factor that is not in your Schussmeldung: the sea state. Since the Tube 4 shot ran much deeper than its setting (in meters, I assume, if your figures were straight from the TDC panel) -- this would indicate either a depth-keeping malfunction (which I have not seen before in GWX), or the influence of intense wave action on the torpedo &/or the target.
Re the Tube 2 shot, perhaps at the point of impact there was just enough curvature of the hull in the vertical axis to cause the "ricochet". The odd thing is, a depth setting of 5 m. would normally work on almost any merchant ship. So, again, the sea state could have been a major contributing factor to the misfire.
Danke for the Auskunft. Mach's gut!
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Dietrich Schöneboom, U-431
"Es wird klappen, Herr Kaleun. Ganz sicher."
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