Why do planes have to take off against the wind when they land and take off?

Why does an airplane always go around the airport when it takes off or lands?

As the fastest means of transportation at present, the airplane has been used for long-distance transportation and passenger transportation, many friends should have also sitted, and the airport of the aircraft is generally built far away from the city, one is because the aircraft can not be too high around the building, and the other is that the aircraft takes off and lands with great noise, and now the large passenger aircraft are mainly jet fixed-wing aircraft, this kind of aircraft takes off and lands need to taxi a long distance, such a large area if in the city center, the cost is too high.

Attentive friends should find that airliners generally go around the airport before landing, what is the reason for this? Do you observe your prey like an eagle? Of course not, the altitude at which the plane flies is outside the visual range, the runway on the airport is almost a line, and there is no possibility of observing the prey at all, so what is the reason for this?

In fact, this is similar to driving a plane, the vehicle must obey the traffic rules when driving on the road, and the plane is the same, although the plane is in the sky, it looks like it is unrestrained and free, but the plane also has a route plan, and the take-off and landing also need to be uniformly controlled by the airport dispatch center, otherwise only rely on the pilot's observation, the landing is basically a ghost gate, not looking at the technology only to see luck.

There was once a report in a foreign country that the airport scheduling was wrong, and there was a plane ready to take off on the runway where the plane landed, and after the landing plane saw that the situation was not right, it was urgently pulled up, and the plane below was only a few meters away, and before the plane was ready to land, the altitude and flight attitude would be adjusted when turning in circles, so as to facilitate landing, <>

Another reason is the weather, sometimes there is fog at the local airport, and other conditions that affect the observation, the plane is waiting for the right time in the sky, or the rain, snow and windy weather, the plane will be assessed above, either continue to land, or only transfer to other airports. We often hear that planes are postponed or canceled due to weather reasons, all because the take-off and landing of planes has relatively high weather requirements, and it attaches great importance to the safety of passengers' lives and property. You tell me?

The mass of the aircraft is very large, and the inertia generated during the movement is very large, and if it takes off and lands against the wind, the drag can be increased as much as possible to prevent the aircraft from deviating from orbit and unimaginable accidents occur.

When the air flow through the wing, there will be a pressure difference between the upper and lower levels, and the different forces on the upper and lower surfaces of the wing produce lift, and the magnitude of this lift is related to the velocity of the air flow through the wing. When there is no wind, the aircraft moves forward, which can be seen as the airflow flowing backwards relative to the aircraft, so there will be lift, and when the wind is upfront, the airflow has the initial velocity relative to the aircraft, so the aircraft can also get the same lift when taxiing at a smaller speed, and the take-off and landing are easier and safer.

An aircraft (fixed intelligence aircraft) refers to an aircraft with wings, one or more engines, propelled by its own power, and can maintain a density greater than air in space or the atmosphere. If the density of an airplane is less than air, it is an empty ball or an airship. If there is no power plant, it can only glide in the air, hence the name glider.

If the wing of the aircraft is not fixed, and the lift is generated by the rotation of the wing, it is *** or gyroplane. Fixed-wing aircraft are the most common form of aircraft. Power** includes piston engines, power propeller engines, turbofan engines or rocket engines, among others.

At the beginning of the 20th century, the Wright brothers of the United States made a significant contribution to the history of world aircraft development. [ext1] No. 5 was first successfully tested as an airplane flying by self-powered manned flight. They received the U.S. Congressional Honor Award in 1999.

In the same year, they founded the Wright Aircraft Company. Since the invention of airplanes, airplanes have become an indispensable means of transportation for modern civilization. It profoundly changed and influenced people's lives, starting the history of conquering the blue sky.

The reason why the plane flies against the wind seems strange, because the wind reduces the relative speed of the plane and the ground. You may not know that when an airplane takes off from the ground, it is not the relative speed of the plane and the ground that matters, but the relative speed of aviation. If the oncoming wind is 30 kmh, then the relative velocity of the aircraft and the air is 150 + 30 = 180 kmh.

If the flight is downwind, the relative speed of the aircraft and the ground will be faster, assuming 165 kmh, but the wheel is closed, but then the relative speed of the plane and the air will only be 16530 = 135 kmh. Now you know, airplanes tend to take off against the wind.

The plane takes off with a headwind, and the plane lands with a headwind.

The take-off and landing of the aircraft should be as far as possible to choose against the wind, because the headwind take-off and landing can increase the lift or drag to reduce the ground clearance or landing speed of the aircraft, so as to shorten the take-off and running distance or landing distance of the aircraft, and at the same time the windward take-off and landing is also conducive to the direction of the aircraft in the movement of the stable high wheel qualitative and maneuverable, relatively safe, because the speed of the aircraft take-off and landing is relatively slow, the stability is poor, in case of strong crosswind, the aircraft will be blown crooked.

Therefore, in general, downwind landing should only be made if headwind conditions cannot be selected and the runway length is sufficient. However, the speed, weight and stability of the current aircraft are greatly improved and improved compared with the previous aircraft, and the influence of wind direction on the take-off and landing of the aircraft is reduced.

Extended Materials. The take-off of an airplane depends on the lift generated by the relative motion with the air, and the magnitude of the lift depends on the relative speed of the aircraft with the air, not the relative speed of the aircraft with the ground. If taking off against a headwind, the aircraft taxiing speed is opposite to the direction of the wind speed, and the relative velocity of the aircraft and the air is equal to the sum of the two.

At this point, the aircraft only needs a small glide speed to get the lift it needs to get off the ground.

As a result, the distance required to take off against the wind will be shorter than if it were to take off without wind. Conversely, if taking off downwind, the aircraft needs to reach a higher taxiing speed to get the lift required from the ground, and the glide distance is relatively longer.

The landing of an airplane is similar to that of an airplane taking off. During landing, the aircraft needs to maintain sufficient lift while constantly decelerating to ensure that the aircraft can descend smoothly. When landing against headwinds, the aircraft can obtain the required lift at a lower speed, thereby reducing the relative velocity to the ground at the moment of grounding, thereby reducing the taxiing distance.

When landing downwind, the relative speed of the aircraft to the ground is greater than when landing against the wind, in order to obtain the same Nian Zun lift. This makes the speed of the aircraft at the moment of grounding larger, the taxiing distance longer, and the poor control is easy to cause potential safety hazards.

1.Ordinary aircraft:

Take off: hold down W to accelerate, press the key when the tail of the plane is raised (that is, the speed has reached a certain level), lift the nose of the aircraft, press the + key of the keypad to retract the landing gear, climb up, do not keep pressing the key, then the plane will fall.

Level flight: Hold down W to accelerate, A and D keys can be steered by tilting the wings (advantages: large amplitude, disadvantages: difficult to control), Q and E are steered by vertical tail (just the opposite of the A and D buttons).

Landing: Press the + key of the keypad to lower the landing gear, press the S key to slow down, then press the key to descend, and then press the button to lift the nose of the aircraft when landing (imagine a real plane landing).

2.Harrier VTOL Fighter:

Take off: Press and hold the W key, it will rise vertically, then press the + key of the keypad to put away the landing gear, press and hold the number key 8 of the keypad, at this time the thruster turns back, pay attention to the W key to hold on, and then you can enjoy the rapid flight

Level flight: Same as "ordinary aircraft".

Hail falls: There are two kinds of landing, one you can do like a normal plane, and the other is: press the S to reduce the speed before landing, press the keypad + lower the landing gear, press the keypad number keys 2 Turn the thruster down, and then press and hold the S key.

: Take off: Press and hold W.

Forward: Press the W key and then press the button in the morning car, and don't hold the upper button unless you want to play Black Hawk Down.

Back: Press and hold the W key and then press the KEY again.

Landing: Press and hold the S key.

Some planes have machine guns, so try pressing the left CTRL key to shoot bullets, the spacebar to aim (green track, turn red to lock), and shift to fire missiles.

For the sake of safety, what kind of wind direction will be chosen when the aircraft takes off and lands?

a.Headwinds. b.Downwind.

Correct Answer: a

The benefits of taking off against the wind: increased relative velocity, high air flow and high density, and high air pressure (strong) acting on the upper and lower sides of the wing, which helps to increase lift.

The benefits of landing against the wind: 1. The resistance of Daqing Sou helps the aircraft to slow down; 2. The velocity and density of the airflow through the lower surface of the wing are large, which is conducive to maintaining lift, so that the aircraft has a small floating speed near the ground without losing lift.

Airplane is a modern commonly used means of transportation, airplane convenient, fast, has become the first choice for people to go out, long distance, I believe that many friends who have taken the plane will find that the plane takes off and lands when you need to go against the wind, and not with the wind, why the plane should take off and land against the wind?

We're used to saying "nice sail" to people who are away from home, but did you know that planes take off and land in headwinds?'。The plane lands against the wind may make sense for most students, but when taking off, they also choose to go against the wind, and some students must not figure it out. In fact, this is not the right thing to do here.

Airplanes are different from ships, ships traveling with the current travel fast, but airplanes pay attention to lift.

The take-off of the aircraft is supported by the lift generated by the relative motion with the air, and the magnitude of the lift depends on the relative speed of the aircraft and the air, not on the relative speed of the aircraft and the ground. When taking off against the wind, the relative velocity with the air is equal to the speed of the aircraft and the wind speed, because the relative air movement speed is large, the lift is also large, so that the running distance can be reduced, the running time of the engine at the maximum horsepower take-off can be reduced, the fuel cost is saved, and the engine life is prolonged. On the contrary, when taking off downwind, the lift is comparatively smaller.

That is to say, when the aircraft takes off, if there is a wind blowing head-on, under the same speed conditions, it will obtain a greater lift than when there is no wind or downwind, so it can take off from the ground relatively quickly, and when landing against the wind, you can use the resistance of the wind to reduce the speed of some aircraft relative to the ground, and shorten the running distance of the aircraft after landing.

In addition, the aircraft is slow to take off and land, and the stability is poor, and the aircraft may deviate from the runway in the event of a strong crosswind. Windward take-off and landing is conducive to the stability and maneuverability of the direction of the aircraft in motion, and it is relatively safe. As a general rule, downwind take-off and landing should only be done if headwind conditions cannot be selected and the runway length is sufficient.

International civil aviation regulations stipulate that if it is taking off and landing downwind, the wind direction and wind speed must be less than 5 meters and seconds. However, with the continuous development of technology, the speed and stability of the aircraft have been greatly improved and improved, and the influence of wind direction on the take-off and landing of the aircraft has also been reduced.

How does the plane take off?

··· The first to take off and the last to land.

Today's planes are all jet-type, all rely on tail thrust, and then pull up and take off by the tail amplitude, and the landing is deceleration and gliding, and there is no thrust to land slowly.