The high temperatures encountered during flight severely impact the structural design of hypersonic aircraft. They can lead to high thermal stresses and a significant reduction in material strength and stiffness. This reduction in structural rigidity requires innovative structural concepts and a stronger focus on aero-elastic deformations in the design and optimisation of the aircraft structure. This article investigates the effects of high temperatures on the flutter behavior of the wing of the A2 aircraft, a Mach 5 transport aircraft designed as part of the European Commission Framework VI LAPCAT program. The article presents results for various simplified temperature distributions. These temperature distributions were imposed to look at the fundamental trends in the flutter velocity and frequency with both temperature and temperature distribution. The results for the A2 wing are compared with other wing models to identify effects of geometry variations. The analysis shows that the flutter velocity drops by about 20% when a uniform temperature of 500 °C is applied to the wings. When temperature gradients are applied, a drop of 5–10% is found, which is in line with findings in literature.

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