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What is the propeller’s mechanical efficiency?

 The propeller’s mechanical efficiency is calculated as: 

propefficiency1

The thrust stand measures the thrust and torque generated by the motor on the load measurement unit and the rotation speed by the optical RPM probe. The propeller’s mechanical efficiency has the unit of measurement of kgf / W (kilogram-force per Watt).

The propeller’s mechanical efficiency is a factor:

  • To determine the propeller’s performance
  • To determine if the propeller works well with the motor
  • To optimize the weight, the shape and the dimension of the propeller

Generally, the propeller’s mechanical efficiency (kgf / W) decreases when speeding up.

For the same propeller tested statically, the thrust is only dependent on the rotation speed (and the geometry around the test area).