Unmanned Aerial vehicles have gained immense popularity in recent time in commercial applications, especially quadcopters, due to their multiple civil applications and low manufacturing and customisation on the basis of customer needs, but they still face one major issue of low flight time. This book describe in detail the methodology of flight time optimization, which is being achieved through integration of solar panels in the quadcopter for the utilization of solar energy as a power source along with the conventional DC source battery and by efficient weight reduction of the quadcopter for flight time optimization.