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http://dx.doi.org/10.5307/JBE.2010.35.5.302

Tail Rotor Design and Thrust Test for a Roll-balanced Agricultural Unmanned Helicopter  

Koo, Young-Mo (Dept. of Bio-industrial Machinery Engineering, Kyungpook National University)
Bae, Yeong-Hwan (Dept. of Industrial Machinery Engineering, Sunchon National University)
Seok, Tae-Su (Hansung T&I)
Shin, Shi-Kyoon (Hansung T&I)
Park, Hee-Jin (School of Electronics Engineering, Kyungpook National University)
Publication Information
Journal of Biosystems Engineering / v.35, no.5, 2010 , pp. 302-309 More about this Journal
Abstract
Aerial application using an unmanned agricultural helicopter would allow precise and timely spraying. The attitude of a helicopter depends on a number of dynamic variables for roll-balanced flight. Laterally tilting behavior of a helicopter is a physically intrinsic phenomenon while hovering and forwarding. In order to balance the fuselage, the rotor should be counter-tilted, resulting in the biased down-wash. The biased spraying toward right side causes uneven spray pattern. In this study, a raised tail rotor system for the roll-balanced helicopter was studied. Thrust of the tail rotor system was measured and theoretically estimated for the fundamental database of the roll-balanced helicopter design. The estimated tail thrust and roll-moment would be used to design the raising height of tail rotor and roll balancing dynamics. The unmanned agricultural helicopter required the tail rotor thrust of about 39.2 N (4.0 kgf) during hovering with a payload of 235.4 N (24 kgf). A raised tail rotor system would compensate for the physical tilt phenomena. A further attitude control system of helicopter would assist roll-balanced aerial spray application.
Keywords
Unmanned Agricultural helicopter; Roll-balanced attitude; Tail rotor thrust; Anti-torque; Spray pattern;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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