This paper presents an experimental investigation focused on aerodynamic forces and shock waves of a waverider. The study is carried out in the wind tunnel MARHy located at the ICARE laboratory of CNRS-Orleans. The facility can recreate the atmospheric re-entry flight of any vehicle in terms of viscous parameter and Knudsen number. The present work was carried out at hypersonic flow condition with a Mach number 20 and low density equivalent to 100 km of altitude. The model is a waverider optimized for optimal Lift to Drag ratio at Mach 10 and 50 km of altitude. The objective of this work is to analyse the behaviour of this waverider at high Mach number and altitude. The investigation of aerodynamic forces shows the waverider falls down for angles of attack higher than 15°. To confirm and explain this stall density inside the shock wave have been analysed from flow field a visualisation. This study shows a phenomenon of separation bubble which imply a constant pressure at the waverider surface. The bubble is observed thanks to luminosity intensity profiles and showing the displacement and increase of this bubble with the local rarefaction degree. As a consequence the shear layer can not reattach due to the separation bubble so the lift force decrease and the waverider falls down.