Hmm, I'm working from memory, too, but the units don't look right...
The OP had gm.cm, so to get to SI there's a division by 10^5
And watts are Nm/s, so there's a g=9.81, and a 60 for the RPM to seconds.
So I'd say:
watts = gm.cm.RPM x (2*pi*9.81)/(60*10^5)
and that seems to jibe with a quick turn around my Evershed & Vignoles
"PowerRotor" circular calculator...
Anybody with a crib-sheet?
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