Unequal-radius tandem three-rotor helicopter

Abstract

The invention provides an unequal-radius tandem three-rotor helicopter. A longitudinal beam is arranged at the top of a helicopter body; wing-shaped small towers are correspondingly arranged at the front part, the middle part and the rear part of the longitudinal beam; the small tower at the rear part is higher than the small tower at the front part; a rotor is arranged on each small tower; rotating surfaces of the three rotors are horizontal and equally spaced; propeller blades of each rotor are connected with a rotor shaft through a propeller hub; a propeller blade swinging device consistingof a swinging hinge, an oscillation hinge and a variable pitch hinge is matched for each propeller hub; a collective pitch and periodic variable pitch controller is arranged to control the size and the direction of a rotor lift; a transmission device is arranged to enable angular velocities of the three rotors to be as same as each other so that the rotating directions of the front and rear rotors are as same as each other and are reverse to the rotating direction of the middle rotor; each rotor consists of propeller blades with same airfoil profiles, same span-chord ratios and same number; the radii of the propeller blades of the front and rear rotors are as same as each other; the radii of the propeller blades of the front and rear rotors are equal to 0.87 times of the radii of the propeller blades of the middle rotor so that the reaction torques of the three rotors offset each other; a rotor synchronizing device enables phase differences of the three rotors to be always kept constant; a landing gear is arranged at the bottom of the helicopter body; and the unequal-radius tandem three-rotor helicopter is applied to rescue, transportation and the like.

Description

technical field [0001] The invention relates to a tandem three-rotor helicopter with different radii, which adopts multi-rotor vertical lifting, hovering, front-back, left-right, and left-right flight independently of the airport. Background technique [0002] At present, the known successful methods of helicopters that can realize vertical lift, hovering, front, rear, left, and right flight include single-rotor helicopters and tandem dual-rotor helicopters. Manipulation has the advantages of simple structure and flexible manipulation, but the anti-torque of the rotor of the single-rotor helicopter needs to be balanced by the tail propeller vertical to the rotating surface. This propeller does not produce vertical lift and consumes a little power. For a pair of forward and reverse rotors with the same size at constant speeds, the counter torques of the rotors cancel each other, saving a little power, but both rotors must participate in the control of pitch, roll and heading,...

AI Technical Summary

Problems solved by technology

[0002] At present, the known successful methods of helicopters that can realize vertical lift, hovering, front, rear, left and right flight include single rotor helicopters and tandem dual rotor helicopters. Manipulation has the advantages of simple structure and flexible manipulation, but the anti-torque of the rotor of the single-rotor helicopter needs to be balanced by the tail propeller vertical to the rotating surface. This propeller does not produce vertical lift and consumes a little power. For a pair of forward and reverse rotors with the same size at constant speeds, the counter torques of the rotors cancel each other out, which saves a little power, but both rotors must participate in the control of pitch, roll and heading, and pitch, roll and heading cannot be independent Control, the control characteristics are worse than those of single-rotor helicopters, the control burden of the two rotors is large, and the heading stability is poor

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