This study focuses on a stress analysis of a simplified aluminium hang glider composed of rigidly connected tubes. The introduction includes a brief history of hang gliding, parts of a common hang glider and its working principle. The difference between paragliding, hang gliding and gliding is pointed out. The second chapter shows the geometry of the simplified aluminium structure which is to be analysed. It was made according to the commercial hang glider PULMA 2000. In the third chapter a stress analysis during flight has been carried out. Comparison of results is shown for two cases, first one being the least favourable load case when the pilot's entire weight is concentrated in one point on the main aluminium frame, and the second one being closer to the real load case when the weight is distributed on several points by the Coupling option. In both cases, stress distributions are shown before and after installation of the motor. Additionally, the influence of mass of a mounted motor and the mass of the frame itself on the stresses is analysed. Chapter four deals with the stress analysis during landing. Landing is described as an impact load on the wheels at the moment they touch the ground. In the fifth chapter, a change of the used material is considered. Aluminium could be replaced with, e.g. steel or titanium. Examples of geometry optimization are set forth, and stress analyses are carried out for the given changes. In the final part, a conclusion was made based on the conducted stress analyses.