Patent ID: 7425167
Filing Date: 2008-09-16
Classification: A63H

Abstract:
1. A remote control toy helicopter comprising a body with a tail; a motor and a battery for the motor, the motor being controllable by a controller remote from the helicopter body; a unitary one piece main rotor having two propeller blades which is driven by a rotor shaft on which main rotor is mounted; a tail rotor which is driven by a second rotor shaft directed transversally to the rotor shaft of the main rotor; an auxiliary rotor driven by the rotor shaft of the main rotor in the sense of rotation of the main rotor, the auxiliary rotor being mounted in a swinging relationship on an oscillatory shaft provided essentially transverse to the rotor shaft of the main rotor and the swinging motion being relatively upwardly and downwardly about the oscillatory shaft, the main rotor and the auxiliary rotor having planes of rotation spaced of each other and being linked with each other by a mechanical linkage, such that the swinging motion of the auxiliary rotor controls an angle of incidence of the propeller blades of the main rotor, wherein a first longitudinal axis of the auxiliary rotor runs through the rotor shaft, and wherein a second longitudinal axis extends from the ends of the propeller blades towards the rotor shaft, and the auxiliary rotor is mounted for rotation removed from a plane of rotation for the main rotor, wherein the propeller blades of the main rotor are pivotably mounted on a spindle which is fixed on the rotor shaft, and the spindle is substantially parallel to the second longitudinal axis, wherein each propeller blade has a leading edge formed in the form of an upwardly convex curve running from a free end of the propeller blade towards the rotor shaft, and wherein each propeller blade is provided over its substantial longitudinal length with a profile from the leading edge towards a trailing edge having the form of a further upwardly convex curve.