The mutual aerodynamic interaction between the wing and the propeller is described. Propeller driven aircrafts interest is increasing nowadays and the correct propeller integration can lead to significant aerodynamics improvements or affecting the project feasibility if this interaction is not well captured. The wing-propeller interaction problem is still difficult to predict by CFD in its complete extension. The paper introduces those effects by means of wind tunnel test results and compares the accuracy of two CFD methodologies.