I don't believe that the RPM's have an effect on speed, use External view to watch a Liberty Ship's propeller, it spins at a impossibly slow speed.
I used the Goblin Editor app to view the speed, and the Liberty ships propeller spins at somewhere between 30 and 45 RPM, I cannot remember it exactly.
The Real Liberty ships un-geared engine spins at 76 RPM when at maximum speed.
And the C2SB1 Hull Large Merchant/s propeller spins at about 30 RPM in SH5, and it cruises at 12 knots (?) But in real life this ship could move at about 19 knots, I have been editing these values myself to make them look more realistic because these values are very hard to find.
I usually set ships propeller speed to around 200, just to make it look better.
I do not believe that the sounds are synchronized with the actual speed.
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