The future of exploration, transportation and conflict is in unmanned aircraft, sometimes referred to as drones, UAVs, UAS or RPAS, unmanned aircraft are revolutionising our ability to monitor and understand our environment. Our goal is to design the UAV trajectory to minimize the total energy consumption while satisfying the requirement and energy budget, which is accomplished via jointly optimizing the trajectory and UAV´s velocities along subsequent hopsWe needed our own custom airframe, made specifically for long-distance flight with a heavy payload. The fuselage is essentially dead weight, it doesn´t generate any lift on the aircraft. The aircraft is equipped with integrated brakes to control the revolution of the rotors. The main rotor can be rapidly dismounted for storage and maintenance. The UAV is capable of flying in a hovering mode and moving slowly, or with high speed in any direction, our drones are a new tool that can increase safety.UAV is highly effective, both in terms of energy consumption and outage performance. In the future, the new approach would be developed to help designing better trajectories for energy minimization in applications that involve UAV-enabled wireless communications with latency constraints.