QUADCOPTER WITH HYDRAULIC DRIVE OF ROTORS WITH FIXED PITCH OF BLADES Russian patent published in 2020 - IPC B64D35/04 B64C27/08 

FIELD: aviation.

SUBSTANCE: invention relates to aircraft engineering, particularly, to design of rotors of multirotor aircraft. Quadcopter with hydraulic drive of propellers with fixed pitch of blades comprises mid-flight internal combustion engine, four rotors with fixed pitch of blades and hydraulic drive of rotor to transfer power from engine to rotors. Drive comprises hydraulic circuit, which includes hydraulic pump, supplying working fluid to input of hydraulic actuator, outlet of which is connected via hydraulic line with low-pressure drain line to hydraulic pump inlet. Hydraulic drive contains two tandem gear hydraulic pump, having direct drive without reduction from engine. Each of tandem of hydraulic pumps has two independent inputs and outputs, it feeds two actuating hydraulic motors. Before each input of hydraulic pump in drain line of low pressure working fluid flow rate regulator is installed. Ratio of efficiency of hydraulic pump to efficiency of hydraulic motor is in range from 1:1.5 to 1:3.

EFFECT: higher flight safety, manoeuvrability and stability in flight, higher transmission efficiency.

1 cl, 1 dwg