This paper surveys the proposed solutions for the design of an ultra-light Unmanned Aerial Vehicles, investigating the requirements for the components of the structure. In particular this paper focuses on the electrical components of the project, showing a brief review of the single objects and their applicability for the design of a Solar Powered Airplane. The aim of this paper is to offer a starting point for researchers who wants to approach the design of electric drives for solar powered airplanes, giving basic information about the state of the art of the UAV projects and the requirements for the power system management elements.