00:00Do you know how drones work? The key lies in the propeller. When it rotates at high speed,
00:05it pushes the air downward so that the drone obtains upward lift. When the lift is greater
00:10than the gravity, the drone will rise, and vice versa. When the lift is equal to the gravity,
00:15it will hover in the air. The propeller is connected to the motor. When the propeller
00:20rotates, it will generate an opposite force, which will make the fuselage rotate accordingly.
00:26Therefore, the helicopter needs a tail rotor to offset the rotational force.
00:30If a drone is designed without propellers, it will keep spinning and spinning. However,
00:35drones generally use four rotors, but if the four propellers all rotate in the same direction,
00:41it will still spin in place. Therefore, the direction of the adjacent propellers of the drone
00:47is opposite. When the rotational speeds of the four propellers are the same,
00:51its direction remains unchanged, but it can be turned by simply changing the speed
00:57of the diagonal propellers. If the speed of the two rear propellers is faster,
01:01then it will fly forward. If the speed of the side propellers is faster,
01:05it can naturally fly left and right. Even if the drone is disturbed by strong winds,
01:10it can always remain stable by increasing the speed of the side propellers.
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