Last month I touched on trying out various props on electric motors with an ammeter in the circuit, to make sure that you don't exceed the maximum amp rating of the motor, ESC or batteries. I suggested that if you get to the current limit before you get to full throttle you must stop and disconnect, because you don't want an overload. Fit a smaller prop and try again. Just in case anyone thinks "Oh, I'll just fly at half throttle to stay within the limit!" Don't! Speed controllers don't just reduce the amps and volts as the meters might suggest. They actually blip full power on and off extremely quickly, and the ammeter and voltmeter just average it out. But really you are taking bursts of the full amperage from the battery and through the circuit. That may be OK for a few seconds but you can't fly like that for any length of time without damaging something. If it looks as though full power will exceed the current limit of any one of your components, stop the test and fit a smaller prop.
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