The value that I measured from the stand is different from the data I obtained from the same stand in the past.

The value that you obtained can sometimes be different than what the motor and propeller performed in the past. This can be due to the following reasons:

• The power source: you may have changed using the power supply to the LiPo battery or vice versa.
• The motor: aging coils may affect the motor efficiency
• The ESC: change of the ESC can sometimes trigger issues, please make sure to use an ESC that is properly rated for this motor, the maximum amperage shall never be too far or too close to the motor’s limit
• Sampling rate: if you are running a automatic control script, please make sure to have a large enough sampling average as the ESC may compensate the speed during a hold and can trigger higher/lower torque and thus affect efficiency

Please also understand that the thrust stand is a tool to characterize the overall performance of your propulsion system, it is not used for the dynamic testing and many more factors may contribute to the measurement discrepancies.

Under some circumstances, the measurement discrepancies may also be due to the aging load sensors. If you are currently using the Series 1585, you may recalibrate the load cells using the wizard in the GUI.