It does not show as well in the stock game because you can not always see the sub depending on your settings for the game. I think it is the environment mod that makes it look more visible, if I remember right. (I don't use it, my video card doesn't handle it very good)
But here is the wake in stock in the picture on the left. The red arrow points to the periscope, which is near the center of the sub. In the picture on the right you can see as the torpedo starts to move away, the wake goes with it. So the wake is set to a certain length and it appears as soon as the torpedo does and then travels with it.
So, in order to make a wake it has to extend behind the torpedo and that is why is shows over the sub at the start. Normally you would be looking through the periscope while shooting so you wouldn't even notice it.
Peabody
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