Flight Characteristics of Quad Ducted Fan Helicopter with Thrust Vectoring Nozzles
As an unmanned aerial vehicle (UAV), a quad rotor helicopter (QRH) uses a tilted attitude to generate a horizontal thrust component in the flying direction. In the case of autonomous control, the attitude control system is used to tilt the airframe against disturbances such as crosswinds. Consequently, the flying attitude of a QRH is always inclined. In this study, thrust vectoring nozzles (TVNs) were mounted on a quad ducted fan helicopter (QDH) to maintain a horizontal attitude. The TVNs were tilted to generate thrust against disturbances without inclination of the airframe. The system was constructed using a QDH and TVNs inclined to two axes. Because the airframe is always horizontal, the system can be used for precise measurement e.g. landform and building.
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