My apple water bin dump uses a .5 horse 3 phase 220 VAC motor attached by
pulleys and belt to an outboard motor prop in a tube to pump water. Maybe
1"
head at 100+ GPM. I just measured the current draw on this motor at 1.5
amp,
2.0 amp, and 2.2 amp with a clamp A-meter.

Na, I'm not totally re doing something that has run 20 years. But I'd like
to try a different prop - it might be better. If not, I'll go back. My only
question is if this motor will have enough power at 1/2 speed. Do you know
how to figure that?