Patent ID: 6293492
Filing Date: 2001-09-25
Classification: B64C

Abstract:
A coaxial twin-rotor type helicopter in which an upper rotor and a lower rotor disposed on the same axis are rotated in opposite directions, said helicopter comprising:an airframe, a vertical shaft that rotatably supports the rotors, and a control mechanism that, with respect to a gravitational force direction, can tilt the vertical shaft backward and forward and to either side to thereby tilt tips of blades of the rotors; whereinthe control mechanism has a first slider attached to a lower end portion of the vertical shaft, a first guide-rail formed in an arc centering on a swing center point on a center axis of the vertical shaft so that the first guide rail is freely swingable along the first slider backward and forward or to either side about the swing center point, a second slider attached to a top of the airframe, a second guide-rail that depends from the first guide-rail and is formed in an arc centering on the swing center point, extending perpendicularly, with respect to the first guide-rail, so that the second slider is freely swingable along said second guide-rail about the swing center point in a direction at right-angles to the swinging direction of the first slider, and a control stick that can swing the vertical shaft backward and forward and to either side.