Moin
putting into consideration that there were more than 700 Type VII boats built and how many patrols they fulfilled during the war, 30 aborted missions due to engine failures doesn´t sound like a major issue to me.
On the other hand missing spare parts and tools were certainly an issue during a patrol and if one diesel was out of action the risc of continuing a patrol with only one engine working was not acceptable.
Another issue I can imagine was that the decreasing quality of boats might have been an issue during the war. Caused by shortages in certain raw material and increased production numbers with less qualified workers.
Cheers,
Michael
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