A Non-Dimensional Aerodynamic theoretical modeling for ducted-fan is considered a challenging task due to the coupling between its external flow together with the fan-induced internal flow. The existence of two characteristic velocities together with the free-stream velocity and the fan rotational speed, invoked some complications on the model dynamics. In this work, an aerodynamic model for a double rotor contra rotating ducted fan is created. The Blade element theory is applied to the two rotors. Thrust and torque coupling of the two rotors are estimated knowing the ducted fan design parameters. The model considered the assumptions for Weissinger's model ["] which gives a preliminary calculation of lift and drag for the duct, wing and tail units. This data is used to study the flight dynamics of the ducted fan as well as the performance behavior. The slip stream theory is used as a starting step in calculations.
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