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Posted for Charlie and Tupper England <cengland@netdoor.com>:
With regards to the power input. The motor was an electric 1-HP motor from my table saw. It is a synchronous motor, that tries to always run at 3450 rpm. To vary the speed of the pump, I varied the pulley diameter. the motor will run at 3450 rpm at no load, and continue with only small variations up until you exceed its ability. I don't think that I was anywhere close to causing major slippage. The current the motor draws varies with the load.
Bill,
It would be useful to know the current & voltage feeding the motor during the tests. I think I have an inexpensive clamp on ammeter. If you're interested, email me your mailing address & I'll be happy to loan it to you so we can see some actual power-required numbers for the pump.
Charlie England
cengland@netdoor.com
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