"U Efficiency" motors (from U-series) are aimed for high end UAVs requiring long endurance. This kind of UAVs are usually for surveillance, cruise, security and protection, surveying and mapping. "U Efficiency" motors will reach a max. value in terms of “Efficiency” at a point, but when it comes to the max. thrust, the "U Efficiency" motor is not comparable to “U Power” motor types.
Specifcations (Click to enlarge)
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