| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple and compact steering mechanism which is suitable for a co-axial twin-rotor type small helicopter. SOLUTION: In a one-main helicopter 1, a drive force transmission mechanism 10 to transmit the drive force to upper and lower rotors 5, 6 comprises first and second planetary gear mechanisms 100, 200 provided with a common carrier 104, and when the common carrier 104 is rotated by a motor 301, the differential movement is generated in both planetary gear mechanisms, and the yaw control can be effected since the speed of each rotor is different. Suspension type longitudinal and right-to-left oscillation mechanisms 400, 500 are fitted to a lower end of a vertical shaft 41 supporting the rotors, and when a stick 8 is operated in the longitudinal and right-to-left direction, the vertical shaft 41 can be inclined in the longitudinal and right-to-left direction. When the operating force to the stick is released, the vertical shaft 41 is automatically returned to the original perpendicular condition by the effect of the gravity.
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