I only notice a speed penalty in the S-boats actually.
My suspicion is that this is intentional by the devs who took a 4-engine fleet boat for a model. Note also that while the S-class has that gradual switch from diesel to electric while diving (like in the U-boats), while the fleet boats go from one propulsion to the other immediately.
In any case, I think these behaviours are hard-coded. Would be good to gather up some research and throw it to the devs, though, if it's inaccurate.
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