As turbofan engines are moving towards higher bypass ratios and lower fan pressure ratios, the necessity of shorter intakes to reduce the weight and drag penalty has arisen. However, short-intakes present criticality, especially in demanding condition as high incidence. The aim of this project is to investigate the feasibility of applying a surrogate model to derive the critical angle of attack of short-intakes in order to reduce the computational time required for a subsequent optimisation. The separation angle of attack has been obtained through CFD analyses, evaluating the wall shear stress. RSM has shown to not be suitable for this problem, with a root mean square error of 0.8 degrees, three times the discretisation used in the data.