This work represents the design of an Unmanned aerial vehicle whose takeoff mass does not exceed 50 kg, with intention to maximize range and time of flight. Based on initial characteristics, we set the design priorities and defined aircraft configuration. We analyzed the effect of wing aspect ratio on aerodynamical characteristics of the aircraft, using airfoil analysis program X-foil and developed a computational program in MS Excel. Dimensions, surface areas, masses and appropriate constructional materials were calculated. As a result, we designed an aircraft with high glide ration. It turned out, that the aspect ratio of the wing in our case is upward limited not by aerodynamics, but by structural strength.
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