How does a helicopter work?

The helicopter engine drives the rotor to provide lift and lift the helicopter into the air. The main engine of a single-rotor helicopter also outputs power to the small propeller at the tail. The airborne gyroscope can detect the rotation angle of the helicopter and feed it back to the tail rotor. By adjusting the pitch of the small propeller, the reaction force generated by the large propeller at different speeds can be offset. Twin-rotor helicopters usually use the relative rotation of the rotor to offset the unbalanced lift generated by the rotor.

2, double rotor type

The blade angle of helicopter rotor can be changed by a mechanism called "tilting disk", so as to realize the periodic pitch change of the rotor, thus changing the lift at different positions of the rotor rotation plane to change the flight attitude of the helicopter, and then changing the lift direction to change the flight direction.

At the same time, the engine keeps a relatively stable speed after the helicopter takes off, and different total lift can be obtained by adjusting the total pitch of the rotor, so that the helicopter can take off and land vertically.

Its characteristics:

The outstanding feature of helicopter is that it can do low altitude (a few meters above the ground), low speed (starting from hovering) and the nose direction remains unchanged, especially suitable for small-area vertical take-off and landing. Because of these characteristics, it has broad uses and development prospects.

In the military field, it has been widely used in ground attack, aircraft take-off and landing, weapons delivery, logistics support, battlefield rescue, reconnaissance patrol, command and control, communication, anti-submarine mine clearance, electronic countermeasures and so on.

Used for short-distance transportation, medical rescue, disaster relief and lifesaving, emergency rescue, lifting equipment, geological exploration, forest protection and fire fighting, aerial photography, etc. The transportation of people and materials between offshore oil wells and bases is an important aspect of civil use.