In order to increase the knowledge about hypersonic vehicles an internal project has been performed at FOI during 2020, at department of Aerospace engineering in collaboration with FoT-project Styrda vapen och robotteknik. The first part of the report aims at giving an overview of possibilities and technical challenges in the field of hypersonics with a review of the state-of-the-art from open publications. The second part describes the background in terms of physical limitations and models for prediction of aerodynamic heating of aeronautical vehicles. A first order engineering method is implemented in order to estimate the temperature of the hull. This methodology presented may be useful for conceptual analysis and tactical evaluation of current and future aerial combat systems. Finally, the proposed methodology is exemplified on two critical structural components at hypersonic flight.