More sonar engine sounds?

Were you in a submarine when you were below this ship wdg?

If so did you hear any engine noise?

And hello btw

All i'm trying to find out here, is whether engine noise can be detected through sonar, and how much the flow noise differs between different sizes of ship.

The fact that the prop noise is discernable enough for a WW2 sonar operator to be able to count the prop revs is already known.

I'm not suggesting the flow noise difference between a 5,000 ton ship will be discernable from the flow noise of a 10,000 ton ship, but the flow noise isn't the only sound detected by sonar, and the sonar noise picked up between a small and large merchant may be different. ie: 2,500 and 10,000 tons.
If not from the flow noise, then the sound of the props. Or maybe the sound of the engines, or all three elements combined.

I've looked in the sound files of SH3, and the engine noise is included in some of the files. In others, strangely, it seems to be absent. Some of the files appear to be mis-named accordin to the sounds within them.

I'm just trying to determine what can reasonably be expected to be picked up by sonar, and how the noise differs when tracking various ships using it.

Until we can establish just how much, or what differences cause sonar to detect a noticeably different sound from one ship versus another, we're all going round in circles with different ideas and opinions, and no one can agree on any improvements.

If the developers of Dangerous Waters make simulators for the Navy, but it doesn't allow the ability to determine a ships speed from the prop rotation, then they can't call it an accurate simulator, since we know that can be done. Therefore theres still room for improvement.