The use of solar energy during the operation of a quadcopter can be a possible way toward the energy restrictions that this aircraft suffers from. During this work, a study has been done to prove that it is possible to use a very small solar-assisted quadcopter and provides experimental evidence toward the energy maximization through the management of solar-electric power and fly path improvement. A solar-assisted quadcopter is developed exhibiting improved flight time. In addition, the implementation of power management strategies has brought improvement in net energy for the solar-assisted quadcopter. A test environment for simulation has been developed that includes the model of the quadcopter, analysis on the energy acquired and consumed during flight, and also the results have been compared to the data gathered in real time when it was subjected to flight testing. A practical energy-optimal route in terms of flight with net energy improvements has been effectively proven with actual flight testing. This project focuses on a quadcopter that runs only on solar energy and can fly for more than 24 h. The solar panels convert all the sun’s rays to energy during the day and use them immediately or store them for nighttime. It aims to find, construct, and research a reusable solar-powered quadcopter in high-altitude, long-endurance applications with the success of using greater energy density batteries like Li-Po. To establish a relative comparison of different aircraft types, a rather detailed study has been undertaken to illustrate their successes and failures. A design with an aircraft about the same as in wingspan as NASA’s Helios with significantly reduced mass, nearly 1135 lb has been done. A study on weight sensitivity, and especially power sensitivity showed that at the power which would definitely be enough to fly.