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Old 01-06-2010, 04:44 AM
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Join Date: Apr 2008
Location: Wisconsin, USA
Posts: 8,952

Originally Posted by alaursen View Post
I understand your point about 3 phase versus DC and large voltage drops (power or heat = V X A). However, what do you think about the KV versus RPM? Assuming I am measuring accurately with the tach 7300 RPM and it is an 800 KV motor so isn't that 9.1 V? What am I doing wrong?

Uh Oh
I've never done that, comparing the KV rating of the motor with the battery voltage, and the RPM the motor turns over.

I believe the KV rating is determined by turning the motor over at a specific RPM, and measuring the voltage generated at the motors terminals. Comments everyone???

Also, you must measure the motors RPM with no propeller, since that RPM will be less when a propeller is installed.
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