What is the role of the aircraft speed reducer?

What is the role of the aircraft speed reducer? First, the concept of an aircraft speed reducer, an air brake, also known as a resistance plate, is used on the aircraft to increase the resistance to reduce the flight speed of the controllable surface.

The role of aircraft speed reducer

The speed reducer, as its name suggests, is mainly used for slowing down. On an airplane equipped with a speed reducer, usually 2 to 4 speed reducers are usually arranged symmetrically on the fuselage or wing, and close to the aircraft body in the closed position, the outer surface of which is part of the aircraft streamlined, when needed When the resistance is caused by the hydraulic power, the speed reducer is opened at an angle, increasing the windward area of ​​the aircraft and destroying the streamline shape of the aircraft, forming a resistance and turbulence effect on the air, causing the aircraft to suddenly decelerate. The greater the flying speed, the better the drag effect of the speed reducer. Many speed reducers are made into complex finger shapes, and some holes are deliberately opened to increase the resistance.

Fighters often make maneuver turns in air combat, and the turning radius is high at high speeds, which is not good for air combat. If the aircraft has good deceleration, it can reduce the flight speed in the shortest time and turn at a small speed, it can effectively get rid of the enemy's attack and occupy a favorable position. Therefore, the fighter is generally equipped with a speed reducer.

On other large aircraft, the speed reducer (spoiler) is often placed on the upper surface of the wing near the front of the flap. When the aircraft is landing, the speed reducer (spoiler) is opened. On the one hand, the aerodynamic drag is increased, the deceleration is reduced, and the lift of the wing is also reduced, and the pressure of the wheel on the ground is increased, thereby increasing the friction of the wheel to the ground. , shorten the running distance.