Coquettish Rebirth

Change the suv into a sedan?It sounds like a joke!Mr. Guo Konghui feels this way now!When he heard Jia Hongjian said that he wanted to change the SUV into a sedan, he felt as if he wanted to change the round wheels into square ones—yes, it can be changed, but after the change, the things in the rear Is it a tire?Can it roll along the ground?Similarly, the original name of suv is the abbreviation of "sport-utility-vehicle", which is a sports utility vehicle!What is a sporty type?It means that it can go off-road to a certain extent, that is, it has a high ground like a truck and is not afraid of potholes. As long as it is not an extreme Dakar Rally or something, this kind of suv can basically eat certain roads!What is multi-function?That is, the location is spacious, and a luggage rack can be placed above the head, and a lot of luggage can be transported on the head like a recreational vehicle.At the same time, the rear door can also be opened, and the rear seats can also be folded down, so it can be used as a pickup with a rear cover!Even if you buy a large item in the supermarket, you can still stuff it in the car and take it away!This is called multi-function!

And if the suv is changed to a sedan, what will it become?The three-box car is to have an extra luggage compartment at the back, so there is no rear door, and it doesn't make sense whether the rear seats can be folded down-because the existence of the rear luggage compartment limits the goods that can be stuffed into the car Volume!So in this way, isn't this car less functional?Doesn't it become a car with certain off-road capabilities?How can this be called an SUV?

So Mr. Guo looked at Jia Hongjian, and really didn't know how to ask questions!At the same time, he felt that according to Jia Hongjian's genius, this little brother shouldn't ask such a low-level question, right?Just when Mr. Guo looked constipated and had problems but couldn’t open his mouth, Jia Hongjian took the initiative to explain, “Mr., I’m not talking about changing the SUV into a sedan. I’m talking about keeping the hatchback structure. But the appearance is a bit like a sedan - look at the sedans made in many foreign cars today, the buttocks are also quite high and upturned, in fact, the buttocks are longer and lower than the hatchbacks! So I am in Tell me, can we extend the luggage compartment in the rear of the suv, and at the same time make a finishing structure on the buttocks that comes down from the roof. The car looks a bit like a sedan in appearance, but it is actually a hatchback. In this way It can increase the cargo space, and on the other hand, it can also optimize the aerodynamic shape..."

It turned out that Jia Hongjian meant this!Mr. Guo Konghui's eyes lit up immediately!Yeah, why can't it be done?If this is done, the car will be longer and more aggressive, and at the same time, the wind resistance will be smaller, and the cruising range will be more, which is great!But the old man suddenly thought of a question - "But if this is the case, the car will be too long, right? I'll do the math...how can it be more than 5 meters in length?" There is something wrong with this length!Because the current best-selling sedan like the Bora is only 4.3 meters long.And like Toyota Corolla is only 4.5 meters!Originally, Jia Hongjian said that it would be designed with three rows of seats, but the length of the suv has been extended to 4.9 meters. Behind the seat, the length or thickness can be smaller!If a diversion tail is made according to what Jia Hongjian said, why should it be at least 5.2 or even 5.3 meters?Is this length okay?

You should know that if you don’t talk about the United States, you can talk about parking spaces in China. Basically, the design specification for car parking spaces designated by the country is 5 meters long!For example, a parking space on the street is basically a space 5 meters long along the street.The car parking spaces in the community or parking lot are basically 2.2 meters to 2.5 meters in width. Such a range of 5 meters long!Cars like Corolla can park smoothly in the parking space, but our car is 5 to [-] centimeters beyond the parking space!It feels like twenty or thirty centimeters is not much!But the impact of this matter is quite big-don't forget that when many real estate developers in our country build houses, they build them according to the values ​​stipulated by the country, and they are so strict that they will not exceed them at all!What if there is an idiot real estate developer building a villa, and the internal space of the independent parking garage is only [-] meters?Generally, small cars can park in it.But our luxury car bought by a rich owner can't park in it!Isn't this so funny!What do you think the owner will do then?Should I tear down the parking garage door by myself and find a way to add a part illegally, or should I sell the car and exchange it for a smaller car?Or should you just sell the house?

Eh, no!The old man thought about it carefully, it seems that there are not many luxury cars with a height of more than 5 meters on the market?In the past ten years, the old man has been making civilian cars in Huaxia Hi-Tech.At most, it is a 10,000+ class car, so I don’t think luxury cars are too much a competitor, and I don’t remember the size of cars such as BMW and Mercedes-Benz so firmly—even Huaxia Automobile also helps BMW to produce domestically produced BMWs But BMW didn't provide technology, and our factory here is more about processing materials, so the old man didn't pay too much attention.If he thinks about it now, it seems that this BMW 740li car is more than 5.2 meters long!Since BMW's luxury cars can be more than 5.2 meters long, why can't our luxury SUVs be so long?

Moreover, the old man suddenly remembered what Jia Hongjian said—Jia Hongjian said that people in our country pay too much attention to automobile products, and do not regard automobiles as a daily means of transportation. In many cases, it is still regarded as a durable consumer product like a house.And the car is better than the house, and it can be driven out to show off, so the car has become a kind of face!So Chinese people like the car to look grand, high-end and long!That's right, many times, some Chinese people don't know how to judge whether a car is high-end or not, and they think that the length of the car is high-end!And that's often the case!A luxury car like the BMW 740li is longer than a normal car!So if this statement continues, our car is more than 5 meters long, and it is estimated that it will look particularly high-end in China in the future?

No matter what, Jia Hongjian came up with a new shape here, so naturally he had to make a model out of clay and blow it in the air hole to see!After about two or three days, such an improved SUV model completely designed according to Jia Hongjian's sketch was released!What about such a model, it looks like the buttocks are longer than the previous suv, and it looks like there is a small luggage compartment-because after a certain degree of descent from the rear of the roof to the buttocks, it then turns into It extended about 20 centimeters horizontally and then turned downward.It seems that this horizontally protruding part seems to be a luggage compartment, but in fact it is not—it just makes the rear door into such a shape!This is to allow the airflow to pass from the top of the car to the back of the car all the way down to the rear of the car, so the vacuum area is not small?

Sure enough, after blowing through the smoke flow tunnel like this, I saw the clearly visible smoke flow from the front of the car to the roof, and it was a little faint, and then it became more faint and trembling when it reached the rear of the car, but it was not the same as before. It spreads out immediately, and the vibration is obviously much smaller!In this way, Jia Hongjian can see that this means that there is a lot less eddy current or vacuum zone without others explaining, right?After all, according to the theory that Mr. Guo and the others gave popular science, when the airflow rushes to the surface of the car, the airflow closest to the surface will form a shallow adhesion layer-according to Jia Hongjian's non-professional understanding, it is equivalent to The first batch of air rushing up forms a layer of air cushion, and then the air coming from behind hits this layer of air cushion and slides along the air cushion.But when the car is a hatchback, after passing the rear part of the roof, there is no car buttock, that is, the adhesion layer suddenly has no support, so that the adhesion layer suddenly spreads out, which will cause eddy currents, and then lead to an increase in resistance .And if there is a car butt to guide, although this layer of air cushion will still be discrete after passing the highest point of the car roof, but part of it will go along the car shell, so that the eddy current will be less, so the resistance will be reduced. not enough.

"Mr. Jia, our wind resistance data has come out, 0.42! This data is very good!" The next designer hurriedly brought the newly released data to announce the good news!After popularizing science, Jia Hongjian knew that the lower the drag coefficient, the better!When the automobile industry did not popularize the use of wind tunnels a few decades ago, the wind resistance of the cars generally made was 0.5 or higher, but now it is different. For some small sports cars like Porsche, the wind resistance Can be as low as about 0.3!How much oil does this require, and then the same power can run faster!Of course, our 0.42 data is far from the Porsche sports car data of 0.3. There is no way, how low is the Porsche sports car?How low is the chassis?So we have such a high site, it is not bad to be able to make a data of 0.42!It is estimated that a series of detailed optimizations will be carried out after that, maybe a data of 0.39 or 0.38 can be obtained after a fight!

Jia Hongjian was quite optimistic about such a future, but at such a moment, he suddenly felt as if an idea appeared in his mind, but... it was just as if the words couldn't come out of his mouth. , Such an idea is hidden in my mind, but I just don't show up!This is so urgent! (To be continued..)