PURPOSE: To facilitate flight control and improve the flight control precision by using a guide figure symmetric to a flying region, in the remote control for a helicopter in which the rear part of a body is connected with the ground through a control wire.
CONSTITUTION: The rear part of the body 2 of a remote control type unmanned helicopter 1 for spraying agricultural medicine is connected with a wire driving device 9 on the ground by a wire 8. The driving device 9 is constituted of a reel 10 for winding the wire 8, motor 11 for turn driving the reel 10 in the normal and reverse directions, wire length detecting device 12 for detecting and instructing of the length of the wire 8 to the helicopter 1, guide plate 13, etc. The guide plate 13 has graduation which show 5 the allowable flying angle range for each wire length on each side of the figure symmetrical to medicine spraying region 27. In the wire driving device 9, the diagonal line of the guide plate 13 forms a straight line with the diagonal line of the spraying region 27, and the device 9 is arranged so that the corner on the reel 10 side is superposed with the corner of the spraying region 27.
SATO AKIRA
SUGIMOTO MAKOTO
