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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.
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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"