Fang Lang, who has a clear understanding of this aircraft, no longer thinks that this aircraft is ugly when he looks at this aircraft again. On the contrary, the more I look at it, the more I like it.

casually asked:

"If it's already been tested in the wind tunnel, why hasn't it been made? Is it the rush of time? ”

Surprisingly, after Kurt Tank heard Fang Lang's question, he smiled a little embarrassedly before he slowly spoke:

"It's not entirely because of the time problem, the main thing is that we still have a problem that has not been solved, so we dare not directly build a prototype."

When Fang Lang heard this, his brows furrowed, and he said with some worry:

"Oh! What kind of problem do you mean? ”

There are obviously some things that can't be hidden, so Kurt Tanck can only sigh lightly and say with a little distress:

"While the swept wing allows the aircraft to have better handling at high speeds, it also brings two problems, one is that it can cause the wingtips to stall, and the other is that it is not stable at low speeds.

If we can't solve these two problems well, the reliability of the aircraft cannot be guaranteed at all, and it is impossible for such an aircraft to get orders. ”

These words made Fang Lang fall into deep thought, he had not participated in the design of aircraft, and he did not understand the design principles of these aircraft. But he has an advantage that no one else has, that is, he can clearly know that since the MiG-15 can be mass-produced, it must be necessary to solve the same problem.

As long as there are those differences between the MiG-15 and the Ta-183 in front of you, you will definitely be able to solve this problem.

"What do you mean by this wingtip stall?"

Kurt Tank didn't expect the boss to have such a thirst for knowledge, and seeing that the other party seemed to be frowning and thinking, he stepped forward very carefully and pointed to the wingtips on the drawings and explained:

"The so-called wingtip stall is mainly due to the fact that jets are flying too fast, and when the wing cuts through the air, it causes the airflow to separate at the position of the wingtip, in which case the wingtip loses lift.

Once the wingtips lose lift, it can lead to a loss of maneuverability, and in the worst case, the aircraft can become uncontrolled, tailspin, or even crash. ”

This answer made Fang Lang break out in a cold sweat, and said in his heart, good guy! No wonder they didn't dare to produce prototypes, no one dared to play with this kind of aircraft!

His eyes followed Kurt Tanck's fingers to the wingtips on the drawings, and his mind involuntarily appeared the various planes he had seen in later life.

What is the difference between the wingtip position and the current drawing?

First of all, it can be determined that the wingtip position of the fighter does not seem to be much different, but the wingtip of the civil airliner seems to be a little different, and the wingtip of the Boeing 737 he flew in later generations does not seem to be straight, but upturned!

Why is that?

Immediately afterwards, the MiG-15 and J-2, which I had seen in museums and pictures in later generations, appeared in my mind again, and there seemed to be two sharp bumps on the wings of these two aircraft!

Could these two sharp bumps be the same reason for the upturned wingtips of the Boeing 737?

Fang Lang obviously couldn't answer this question, but he could throw this question to the expert in front of him?

"Since this wingtip stall is caused by the separation of the airflow, can we try adding something to the wing to change the direction of the airflow?

For example, ..... like this"

As he spoke, Fang Lang directly stretched out his hand and drew on the drawing.

And what he compared was the wing knife on the wing of the MiG-15 that he remembered, and the upturned wingtip that he saw on the Boeing 737 airliner.

I thought that the boss was just out of curiosity, and casually asked about his Kurt Tanke, but after hearing Fang Lang's words, he couldn't help but be stunned, and he didn't care too much at first.

But soon his eyes began to become sharp, his gaze continued to move with Fang Lang's fingers, and his mind began to calculate wildly, and in his ears, the boss's voice opened his mind at once.

Gradually, his eyes began to glow, and he said secretly, such a simple question, why didn't I think of it?

Fang Lang said while recalling the aircraft he had seen in later generations, what was the difference in the wing from the aircraft in front of him, first of all, the upturned wingtip fighter was rarely used.

The sharp bumps on the wings must have been designed to cut through the air and disrupt the air flow, but why were there no later modern fighters?

Instead of cutting the air with such sharp bulges, by what means did they use to disrupt the airflow?

Soon, Fang Lang remembered that the front and rear wings of the Boeing 737 did not seem to be smooth and integrated, but had a retractable mechanism, especially when he sat by the window in a plane and saw the plane landing.

The front of the wing of the plane seems to be pushed out, while the rear of the wing is directly open.

The same seems to be true of the wings of later fighters, does this mean that the structure of this wing is the structure of the raised wing that was later eliminated?

Although he did not understand the principle, it did not prevent him from providing this idea to Kurt Tanck for study.

Thinking of this, Fang Lang hurriedly continued:

"No, no, that's not good, maybe we can add a movable part in front of the wing and push it out when needed, or let him move up and down to change the shape of the wing.

In this way, it is possible to change the airflow and simply cut it into two pieces?

Also, the trailing edge of the wing allows him to move, don't you think? ”

Kurt Tanke, who had already opened his mind by Fang Lang's Wing Knife plan, began to look at Fang Lang with a look in his eyes when he heard this new plan.

It's a very simple principle, but why didn't you think of it in the first place?

If you had found any of these options, TA-183 would have been available a long time ago!

Thinking of this, Kurt Tanck couldn't wait to slap himself twice.

After Fang Lang finished talking about his thoughts, he found that Kurt Tank was staring at the drawings in a daze, and asked with some uncertainty:

"Professor Tanke, do you think what I'm saying will solve your problem? Which of these two plans is better! ”

Kurt Tank, who was falling into deep self-doubt, slowly came to his senses when he heard this, and squeezed out a smile with a little bitterness:

"Boss, why didn't I meet you earlier, such a simple question has bothered us for so long."

After speaking, he shook his head helplessly, and then his expression slowly began to become serious, holding his chest with both hands, and looking at the drawings in front of him with his right hand holding his chin, his mind was racing rapidly.

Said in a firm tone:

"Comparing the two options, the second one that pushes the front wings to expand and move up and down is definitely better than the first.

This is because the first solution solves the wingtip stall problem, but the second option also has a very positive effect on stability at low speeds.

If I had to choose, I would definitely choose the second option.

However, the process difficulty of the second scheme is definitely more difficult than that of the first scheme, and the calculation of the whole project will be very huge. ”

Kurt Tanke's words made Fang Lang instantly feel fluttering, but he didn't expect this old boy to look cold, and he was so silky when he patted his fart, which made people feel comfortable listening to it!

Regarding the problems that the other party said about the difficulty of the process and the large amount of calculation, Fang Lang waved his hand indifferently:

"What are you afraid of when the process is difficult, we are not short of money.

What are you afraid of when the amount of engineering calculations is large? Have you forgotten that we have a brand new electronic computer?

Now that you're sure that the second solution will solve your problems, follow the second solution. ”

After hearing Fang Lang's words, Kurt Tanck looked surprised, and hurriedly said to Ante Polman beside him:

"Mr. General Manager, you heard it, the boss agreed that we have set up the project, hurry up and allocate the funds.

I'm going to organize the people right now to put our jet fighter program back on the ground. ”

Looking at Kurt Tank with an excited face, Fang Lang smashed it and smashed it with a little aftertaste, I damn it! This old boy is waiting for me here! Who said that the polytechnic man is honest, stand up for me. Grandma's, I came over to look at the drawings, how to look at it, the jet project team was formed.

Fortunately, he was also preparing to start his own jet fighter research, and now that Kurt Tanck's TA-183 is already the basis, I believe that the progress of the whole project should be faster than expected!

After looking at the TA-183 on the drawing, Fang Lang couldn't help but say one more thing:

"Professor Tan Ke, I agree with the establishment of the jet fighter project, and I have no problem with using your original TA-183 design ideas, especially the shape of this swept wing I like very much.

However, I think it is necessary to make some adjustments to this short fuselage designed for the pursuit of maneuverability, after all, the current TA-183 fuselage has a large cross-sectional area, which will increase the probability of the aircraft being shot in battle.

In addition, if our turbojet engine needs to be purchased from other countries, the power performance may not be particularly ideal, and this situation requires us to work more on the streamlined shape of the aircraft.

Try to design a body with a low drag coefficient.

Do you understand what I mean? ”

Hearing this, Kurt Tank pondered for a while, then looked up at Fang Lang with a serious face:

"Boss, I understand, you dislike him for being ugly."

Hearing this, Fang Lang almost vomited blood in anger, and after seeing the smile on the corner of the other party's mouth, Fang Lang understood that the other party was joking with him. It seems that this German man is not as old-fashioned as rumored, which makes Fang Lang a lot easier.

is no longer polite and straightforward:

"To be honest, he's a bit ugly, and I personally think that as a subsonic fighter capable of reaching Mach 0.8, you don't need to treat him like a propeller aircraft at all.

At such a high speed, the way of dog fighting will also usher in a change, your TA-183 with a stubby fuselage, in exchange for the flexibility of control, will inevitably sacrifice speed, I personally think, this deal is not cost-effective. ”

Kurt Tank is an excellent aircraft designer, his mind is very smart, as soon as Fang Lang said it, he already understood what the other party meant.

With a little hesitation, he asked:

"You mean that we should give up the speed advantage of turbojet aircraft and abandon the maneuverability of aircraft?"

In fact, this involves a change in tactical thinking, and now that the two of them have spoken here, Fang Lang feels that it is necessary for him to explain the future trend he knows to the two aviation experts.

"It's not really a matter of either/or, it's about finding a balance between the two, with a slender and streamlined fuselage that allows the aircraft to fly faster, and a stubby fuselage that gives the aircraft excellent maneuverability.

What we have to do is to strike the best balance between the two, and have enough maneuverability while maintaining our speed advantage. ”