This master's thesis work was carried out abroad at the EURO FLIGHT TEST company, based in Winningen, Germany. The main purpose is to create a mathematical model in MATLAB / Simulink that allows to simulate the behavior of the BS PRIME aircraft. The company, which has recently chartered a BS PRIME aircraft, has provided its willingness to support the project, both during the development phase and during the validation phase. It was in this second phase that the possibility of performing ??ight tests with a specialized pilot was of fundamental importance. This thesis focuses on model validation, comparing the manual and ??ight test data.