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Old 01-06-2010, 04:58 AM
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Location: Wisconsin, USA
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Originally Posted by alaursen View Post
OK due to the excellent input from this thread, I will assume the power is close to battery voltage (ESC input) times the measured current. The RPM cannot predict motor voltage when loaded with a prop. However, it can determine speed (RPM X Pitch /1056).

In this case I am getting about 425 W to the motor; apparently still underpowered at 7 lbs weight. Sorry for the dual subject on this thread but the whole reason I bought the tach today was to try and get an idea of these parameters before I flew it.
Seven pounds at 425 watts? I'd be reluctant to fly it off of grass.
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