Multi-rotor UAV flight principle is easier to fly

August 31, 2021

The rotor, like the wheel, was a magical invention, and until the jet was invented, the rotor had been supporting the human dream. Today, many aircraft are still using the rotor design, and the quadrotor drone is turned into an aerial camera, which satisfies many ordinary people's imagination about the sky.

Multi-rotor drone flight principle

The basic theory of the rotor, friends who have played with the bamboo poles should know: When the movement of the hand gives the bamboo pole a rotation speed, it will produce lift, let the bamboo pole take off.

Multi-rotor drone flight principle
In the same way, the multi-rotor drone is also rotated by the motor to cause the propeller to generate lift and fly. For example, a quadrotor drone, when the sum of the lifts of the four propellers of the aircraft is equal to the total weight of the aircraft, the lift of the aircraft is balanced with gravity, and the aircraft can hover in the air.

When I was a child, I watched the comics. I saw the Doraemon and Daxiong’s bamboo poles flying freely in the air. I wanted to fly in the air and overlook the earth.

But if someone really invents the same bamboo pole now, I definitely don't want to wear it. Because the effect of flying is like this:

Multi-rotor drone flight principle

The propeller is spinning wildly, and people are also spinning in the opposite direction... Daxiong has turned to B. How can he watch the scenery with Shizuka?

According to Newton's third law, while the rotor is rotating, it also applies a reaction force (anti-torque) to the motor, causing the motor to rotate in the opposite direction. This is also why today's helicopters carry a "small tail" that exerts a force in the horizontal direction to counteract this reaction and keep the helicopter body stable.

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