Yup, sounds right. (I always figure +/- 10% for this kind of reading.)
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So Mike and I figured it out. We took 2 motors. One was definitely a 220KV motor. And tested RPMs and Volts. Wrote down the info. Then tested the unknown motor. The readings were almost identical. Both motors are 220kv
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FYI this didn’t work for us. We used the drill / rpm / volt method and we nailed it.
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That’s pretty much what we did and it worked!
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They are 220, yes. So you can’t just run ERPMs to calculate the motor KV. Comparing it to a known motor using a drill to calculate RPMs and Volts worked out. Theory proven that ERPMs can’t be relied on because I have another board with 190s and the ERPMs are exactly the same.
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possible that maybe why never worked for me 
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Do you know of a way to calculate how many RPMs by knowing they are 56,000 ERPMs?
Convert ERPM to RPM?
Count the magnets inside the can by observing the lines of brake dust that stick to the outside of it. Divide that by 2 to get the number of pole pairs. Divide the erpm by the number of pole pairs to get the rpm.
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