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Fan for Small DC Motor (Low quality) wide important to look up motor thrust tests data, and see which props work best with the motor you plan to use. The same propeller can perform very differently on 2 different motors due to design, torque, power etc.

Thrust Numbers are only Reference

Note that thrust number from a static test can be deceiving. These bench tests are done in static environment, therefore it doesn’t represent the motor/propellers true performance in real life. Prop and motor on a quad can generate 20% to 30% less thrust than being on a thrust stand, as well as current draw.

Smoothness

People also like to talk about “smoothness” a lot when describing how good a motor or propeller is. Which is not measurable quantitatively of course, and more of a pilot’s feel. Apart from the design which is far more influential, I’ve found lower pitch props are usually smoother.

RPM and Top Speed

It’s interesting to know that with a quad running heavy propellers that generate lots of thrust at low RPM, is not necessary faster than the one that generates less thrust but at a higher RPM.