Simulate the ducket fun uav

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I want to simulate the ducket fun uav in gazebo, the ducket fun has a propeller and four rudders under the propeller. The attitude control use four rudders, the rudder generate the force because the propeller slipstream. I use the px4 gazebo simulate framework, propeller use the gazebo_motor_modle pulg-in and it worked. I can not achieve the rudders model. How can i build the rudder model, link the rudder force to the propeller slipstream, or just set the rudder force directly. Anyone has an idea? Thanks!