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The overall efficiency is calculated:
The thrust stand measures the thrust generated by the propeller on the load measurement unit and the voltage and current at the ESC input. The overall efficiency has the unit of measurement kgf / W (kilogram-force per Watt).
The overall efficiency is a factor:
- To determine if the propeller works well with the whole power chain
- To calculate the overall flight performance
- To determine if the propulsion system is efficient to your vehicle
Generally, the overall efficiency (kgf / W) decreases when speeding up.
At times, you may observe the overall efficiency further decreases when holding the same throttle. This may be due to the motor starting with cold coils. The electronics’ efficiency goes down with temperature.