Sub physics - experts needed

[goelfou]

Originally Posted by Dr.Sid

Good .. that simplifies some things.

Yet another problem. How fast does the screw rotate ? In DW there are numbers like 7 for TPK, with 30 knots it gives 210 revolutions per second. Seems too much to me.

It could be true if "Turns" referred to turns per seconds.

TPK is the propeller efficiency, I don't have the real algorithm, but in game it seems to be calculated as follow :

Speed = ( Freq * 15 ) / TPK
or
Freq = ( Speed * TPK ) / 15
or
TPK = ( Freq * 15 ) / Speed

So TPK may be "Turns(per 1/4 minute = 15*Freq = rpm/4) Per Knot"