Well, the only thing that comes to mind is that the computer model was cobbled together incorrectly. At this point it is the only thing that makes sense.
To be really historically accurate, you would need three major models:
1. The S-18 through 41 pre-war configuration
2. The S-42 through 47 pre-war configuration
3. The S-42 through 47 wartime modifications
In addition as the S-boats had radar added in 1943 this would need to be reflected in the models. A few of the boats (S-35, 38, and 41) had some rebuilds of the after superstructure done, but we may be getting beyond the capabilities of the game at this point.
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