There are several calculators
In Scorpion Calc is included a sub-menu

1) You select a prop in a list
2) You select rpm or move a cursor to change rpm
You get
Static thrust in gf or ozinf
Power absorbed by the prop shaft in W

I cannot attach here as RCU doesn't support zip or exe files
But you can find on RC-Groups forum
It is free
<http://www.rcgroups.com/forums/showt...p?t=736782>
Louis