Defining the power and propulsion subsystems Let's first choose an aircraft configuration. In this our first Solar UAV, we are going to use Sky-Sailor [1] as the basic prototype. Therefore, we need to set its specific wingspan (3.240m) and aspect ratio (12.9) in Noth's MATLAB code. Electric power. For defining the electric power subsystem, we are going to follow this procedure: 1. We need to determine the day duration and maximum intensity for the month of July. 2 Adjust the MATLAB Code for the wingspan and aspect ratio of the plane. 3. Execute MATLAB Code and get all data of the only solution in the table, for "a" equal to 1.00. 4. Now, check that the Electric design (Excel calculations meet the required mass, area, power and energy). Adjust them if required. 4. Select an MPPT device for Lithium batteries from this list https://genasun.eu/collections/genasun-lithium-mppts check its MATLAB parameter k_mppt = Weight/Power. A good comparison of the different lithium b...