Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Tail Rotor Design and Thrust Test for a Roll-balanced Agricultural Unmanned Helicopter

농용 무인헬리콥터의 가로균평을 위한 테일부 설계 및 추력 시험

  • Received : 2010.08.16
  • Accepted : 2010.09.29
  • Published : 2010.10.25
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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.

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References

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  3. Evaluation of Spray Flight Attitude for Agricultural Roll-balanced Helicopter using Kalman Filter vol.37, pp.6, 2012, https://doi.org/10.5307/JBE.2012.37.6.342
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