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Abstract
This paper presents a design of automatic flight control system for VTOL research aircraft supported by four ducted fans. Ducted fan VTOL aircrafts have not been utilized as actual aircrafts due to some problems, such as stability–and–control, fuel efficiency, e.t.c. A research model of the ducted fan VTOL is developed in order to investigate these problems, which weighs 50 Kg and is powered by 10 HP electric motor. An automatic flight control system is designed to control its attitude and altitude. One axis attitude control experiments on the test stand, suspended three axis attitude control tests, and control tests using the perpendicular pole which enables the body four–degrees–of–freedom motion were performed to examine the control system. As the result of a lot of flight tests automatic stabilization of attitude and altitude of the research model was achieved at a satisfactory level.
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