This thing you're talking about is not only related to airplanes, but also missiles, ships, rockets ... and some of them need a lot of gyroscopes.

Let me tell you what the gyro effect is first, which is the guiding basis for making gyroscopes.

Gyro effect This is a wonderful physical phenomenon. When a rotating object exerts a force at a certain point, the effect of the force will appear at 90 degrees along the direction of rotation, and the rotating object will tend to maintain its original state and resist external forces, that is, the axis of the rotating object will try to maintain its original direction. For example, the rifling in the barrel makes the bullet rotate at high speed to keep straightness, which is to use the gyro effect. The high-speed rotating helicopter main rotor will also have gyro effect, and the control method must also consider the gyro effect when the force effect is delayed by 90 degrees.

Understand the working principle of gyro effect, I think you will understand what gyro is? It is a device that uses gyro effect to control aircraft and other devices that need to maintain attitude or improve handling characteristics.