Why do airplane wings have to be streamlined in order to fly?

Imitate the wings of birds, airplanesWingsDesigned to be streamlined because streamlined wings gain lift more easily.

The wings of an airplane must first be able to generate sufficient lift, and secondly, reduce drag while ensuring lift.

The drag generated by the wing is complex.

If the lift generated by the shape of the wing is insufficient, then its area must be made larger, flying at the angle of attack.

It should also be larger, so as to compensate for the lack of lift.

However, the larger the area of the wing, the greater the frictional resistance, and the greater the angle of attack, the greater the induced drag.

Therefore, if the wing is made symmetrical and streamlined, the drag generated will be much greater than the current profile shape with a certain lift. Especially at low speeds, the drag increases several times.

I'm a little speechless to see your addition.

The front is round and the back is pointed to be called streamlined, and if you move to the back, it is not streamlined, understand??

The streamlined type is also called the droplet type, have you ever seen the shape of the dripping water? The head is rounded, the tail is elongated and pointed, and such a shape has the least resistance. If the front part is pointed, the back part is round, but the resistance is great.

The shape of the wing is truly streamlined, but it is asymmetrical above and below.

It looks like it's on, but it's actually. Why streamlines can fly until now, scientists have not explained this unsolved mystery. It was said that streamlining creates lift?

If the plane flies upside down, the lift force will become a pulling force to the ground, and the plane will crash! And did the plane crash? Of course not, we have seen more than once that the plane can fly upside down, sideways, climb, and the streamlining seems to have nothing to do with the direction of the force!

To this day, scientists have not been able to explain why airplanes can fly.

So what else do you ask?

It's the effect of atmospheric pressure!

Cars, especially streamlined sports cars, do have sides shaped like the wings of an airplane.

Such a body, under the action of relative air flow, produces an upward lift.

Lift is applied to the airplane, and the plane is lifted up, so that the plane can fly in the air.

However, this lift did not give any benefit to the sports cars running on the ground, but caused a sense of floating, failure of handling, and difficult to control.

The body of the sports car is designed to be as low as possible, and the front and both sides of the car are added with blocking plates to reduce the lift generated by the air flowing through the lower part; The rear of the car is added with a wing that looks like it is reversed, and the "anti-lift force" generated can keep the rear of the car close to the road surface, reducing the tendency of tail drift, tail warping, and tail flicking, which is called "road-friendly" road

holding。

On the surface, the rear wing of this car seems to press the rear of the car against the road surface, increasing the friction when driving, but in fact it is insignificant, but at high speeds, the force of tail drifting and tail warping cancels out the force of the rear wing pressing down.

For most family cars, the shape of the car will generate lift due to the air flow to reduce ground friction and reduce fuel consumption, but because the speed of the car is generally low, the air lift of the car is not obvious. However, the high-speed car can clearly feel the air lift, which can significantly reduce the pressure of the car on the ground and then reduce the ground friction of the car (that is, the so-called grip), for many low-end cars, the reduction of grip is very dangerous, and the vehicle is easy to lose control. But with the speed and shape of the car at a maximum of 300 kilometers per hour, it is still quite far from the requirements of flying.

For track racing cars and luxury sports cars, the chassis of the vehicle is very low, so the air flows through the lower surface faster than the upper surface, so the air produces not lift but pressure, and the high-speed racing car is firmly pressed on the track The imitation car loses its grip, so it cannot fly up (but once the operation is improper, the chassis touches the ground, and this pressure will be lost in an instant, and the car is easy to lose control and rush out of the track). At the same time, the tailgate of the car is also intelligently controlled, which can automatically adjust the angle to increase or decrease the air action according to the speed of the vehicle to achieve the required lift or pressure.