Asymmetric multirotor helicopter

摘要

An asymmetric multirotor helicopter has a structure supporting at least one main and two secondary propulsion systems. A flight control unit controls the helicopter by varying the relative speed of each of the main and secondary propulsion systems. Each main propulsion system includes at least one main motor drive and a main drive shaft that carries and propels a main differential contra-rotating transmission configured to share the power provided by the main drive shaft with two contra-rotating output shafts. Each secondary propulsion system includes at least one secondary motor drive and a secondary drive shaft that carries and propels respective secondary propulsion blades. The two contra-rotating output shafts support and propel for mutually contra-rotation motion two sets of main propulsion blades. The main drive shaft rotates in the same direction as one of the secondary drive shafts and at least one secondary drive shaft rotates in an opposite direction.

主权项

1. An asymmetric multirotor helicopter, comprising:
a structure supporting a main propulsion system, two lateral secondary propulsion systems and a rear propulsion system each having a respective drive shaft; a flight control unit that controls the helicopter by varying the relative speed of each of the main, lateral and rear propulsion systems to change the respective thrust and the torque produced by the main, lateral and rear propulsion systems; said main propulsion system including at least one main motor drive and a main drive shaft that carries and propels a main differential contra-rotating transmission; each of said secondary propulsion systems including at least one secondary motor drive and a secondary drive shaft that carries and propels respective secondary propulsion blades; said main differential contra-rotating transmission sharing the power provided by the main drive shaft with two contra-rotating output shafts so as to transfer an increased output torque to the two contra-rotating output shafts without inducing a high reactive torque on said structure; said two contra-rotating output shafts supporting and propelling for mutually contra-rotation motion two sets of main propulsion blades; the main drive shaft rotating in the same direction as the drive shaft of the rear propulsion system; the respective drive shafts of the two lateral secondary propulsion systems rotating in an opposite direction to the main drive shaft; said main propulsion blades providing significantly higher thrust than the secondary propulsion blades; said main drive shaft transferring a torque that varies in a range matching that of the secondary drive shafts; the main propulsion system and the rear propulsion system define a longitudinal axis of the helicopter and the two secondary propulsion systems define a lateral axis of the helicopter, a center of gravity of the helicopter is located in a region around the point of intersection of said lateral axis and said longitudinal axis; and the center of gravity is closer to the main propulsion system than to the rear propulsion system, whereby the multirotor helicopter has an asymmetric geometry.