Constant power method was adopted to improve accuracy of the range and the endurance estimation of battery-powered aircraft instead of constant voltage method. Moreover, the subsystem of propulsion including propeller, coaxial rotor, motor, ESC and battery were reviewed and discussed. Battery weight and capacity were then estimated from fixed wing and multirotor power required. Follow by the hybrid UAV concepts, the design process was initiated by estimating maximum takeoff weight. This aircraft has ability, not only to takeoff, landing or hover as multirotor aircraft but also to cruise similar to the fixed wing aircraft leads to reach the high speed and endurance without additional rotor-tilting mechanism. This study presents the conceptual design of fixed wing battery-powered UAV, designed to carry an Automated External Defibrillator (AED) or any 1.5 kg of payload.
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