Unmanned Aerial Vehicle (UAV) Modeling is very important part in designing an Autopilot to control the vehicle during its flight and predict its motion according to certain guidance law, the overall model consists of 5 important models which are atmospheric model, actuation model, geometric model, aerodynamic model and finally the propulsion model which is the case study of the paper. JAVAPROP is a simple tool for the design and the analysis of propellers, we analysis the propeller to calculate thrust generated by the propeller and to determine the coefficients needed in calculations of thrust force, two steps are needed in order to perform the analysis: determination of the geometric properties of the propeller, and choosing a working area for the propeller.