This article presents the design of a low altitude long endurance solar powered unmanned airship. In the first part of the article, a brief introduction about the airships, their potential areas of usage, the advantages of using an unmanned air vehicle, and a comparison between unmanned counterparts will be given. In the second part, the design criteria and the general design specifications will be outlined briefly. During the design, emphasis is given on the general design parameters of the Lighter Than Air (LTA) vehicles. Lastly, the detailed design results, in order to reach the projected design parameters, have been presented.