A small fixed‐wing RC UAV with a mass of 3kg is equipped with a pack of Li─Po (Lithium Polymer) batteries for its electric motor. If the energy of batteries is just con- sumed in a loiter mission (for electric motor), for a maximum endurance of 40min- utes, determine the mass of batteries pack. Assume that the electric motor is creating 6 N of thrust, with a prop efficiency of 0.77, and the UAV is flying at a speed of 40 m/s.

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