"Speaking of which, it's still the same assumption as before. It is designed based on the most active fighter: the domestic J-7 fighter, that is, the latest modification of the MiG-21 fighter. Zhang Lan said, "The reason why I chose the MiG-21 fighter to be our next main project, the most important thing is that it is cheap enough!" ”

The two girls glanced at each other, but they were not surprised: if you must choose a model as the basis for improvement, then there is no doubt that the MiG-21 is the most appropriate, the cost is not high, the performance is good, although the wing load is not high, but since it is a civilian model, you can completely ignore the problem of the loading capacity of the wing surface.

Zhang Lan counted Alice and Chenxi one by one with her fingers, and said her thoughts, "The price of a J-5 fighter is 750,000 RMB, the price of a J-6 fighter is 1.3 million RMB, and the cost of a domestic J-7 fighter with a technical level in the mid-eighties is about 3 million RMB, but as a subsonic fighter, the J-5 cannot meet our requirements in terms of appearance and performance; As our first supersonic fighter, although the performance of the J-6 can basically meet the needs, the shape is really ugly. It's not quite a fit. After all, only the slightly more expensive MiG-21, which now has more than 2,000 aircraft in service around the world, is the most appropriate. ”

"In the total value of the 3 million MiG-21, the cost of the radar fire control system and the corresponding military avionics system and computer control system is about 1 million - 1.2 million, that is to say, such an aircraft, if it is not equipped with a military weapon system, the real cost is actually only about 1.8 million, or RMB. And these things are exactly what we don't need. ”

In the third-generation fighters in service, such as the F-15, F-16, SU-27, SU-30, etc., the price of the computer system, the radar fire control system and the corresponding avionics system account for a higher proportion of the total price of the whole aircraft, and even reach more than 70 percent.

"The price of 1.8 million RMB, to be honest, is not as expensive as some of the top luxury cars sold in China, our Longxuan 960, Mercedes-Benz S600, BMW 760i, and Volkswagen's Audi A86.0, and even our top sports cars, the price is more than 2 million RMB. Of course, this is just an analogy, and of course we can't really sell a MiG-21 with a dismantled weapon system so cheap. ”

The big eyes of the two girls still blinked, and occasionally nodded their heads, as if they agreed with some of Zhang Lan's statements, but obviously, this only meant that the two girls thought that Zhang Lan's words began to have some credibility.

At all costs. What this kid said does make a lot of sense. But if you want these two girls to fully agree with her opinion, Zhang Lan still needs to come up with something more convincing.

"Indeed, if you talk about the price alone, under the premise of the same air maneuverability, the various modifications of the MiG-21 are undoubtedly the cheapest supersonic fighters that fly at more than twice the speed of sound, and purely in terms of maneuverability, in fact, they are not worse than the performance of the third-generation fighters such as the F-16, F-15, the Mirage 2000-9, the SU-27 and even the SU-30, which is why this fighter can still be seen all over the world."

"Of course, in addition to maneuverability, the aircraft is much worse in other characteristics: the legs are short, and the combat radius of the latest modification is only 900 kilometers; The strength is small, and the weight of the weapons carried is extremely limited; For myopic eyes, the detection range of radar is only 30-40 kilometers. A fighter with so many flaws is naturally abandoned by the air forces of Russia and even richer countries. ”

"But for some third world countries that have no money and a small land area, this fighter is still their most powerful combat tool: under the guidance of ground-based radar and in a small land area, the weakness of short legs and short-sightedness has been greatly compensated." …,

"But is the J-7, also known as the MiG-21 fighter, really a fighter with very poor performance? No. As the world's only one of the world's highest production, the speed of 2 times the speed of sound supersonic fighter, this guy still has a very strong vitality, although the latest improved J-7 fighter still has a few weapon hardpoints, radar detection range is close, but if the fighter does not use its own radar, but by the large early warning aircraft through the data link system, the target parameters are directly transmitted to the fighter. The air combat performance of this fighter is in no way inferior to any third-generation fighter now! In other words, if tactics and collocation are right, it can play a capability that is not inferior to any of the main fighters in the world today. ”

"However, there is a very important problem here," Alice thought for a moment and asked her own question, "because the wing surface load of the MiG-21 fighter was not large when it was originally designed, it requires a runway of nearly 1,000 meters to take off and land, but this length is obviously unacceptable for a light fighter known for its performance." Although this problem can be modified, how can the rising cost problem be solved if it is modified? ”

"I'm not worried about revising this problem, my ultimate goal is to control the price of this aircraft between 1.5 million and 5 million US dollars, and I think that if the fire control system and the corresponding combat data link system are not installed, the air mobility level of fighters at this price should be able to reach the air mobility level of the MiG-29 or SU-27 third-generation main fighters."

"If the price is limited to $1.5 million to $5 million, it's not impossible." Xiao Chenxi and Alice breathed a sigh of relief: at a cost of 3 million RMB, an unarmed "fighter" emphasizing air mobility was produced? To be honest, it's not a big deal! But if it's $1.5 million - $5 million, then everything is not a problem.

You know, on an advanced third-generation fighter, the cost of a radar system will account for one-third to one-quarter of the overall cost of a fighter, and the radar alone saves so much cost, so what about the weapon launch system and the computer fire control system? What about the corresponding control software system? What about R&D costs? The combined cost of these combat things is almost 72%-85% of this fighter!

However, for the MiG-21 aircraft, these problems are not a big problem. With so many questions missing at once, it's no wonder why the brows of the two little girls stretched all at once.

"Goo Dong Goo Dong ~" After talking for so long, his mouth was a little dry, Zhang Lan grabbed the water cup next to him and drank it in one gulp, "Hiccup~" Hiccup comfortably. Comfortable!

"It seems...... It's a bit of a head. The two girls glanced at each other, and Xiao Chenxi said first.

"It's a bit of a trick." Alice nodded, obviously beginning to agree with Zhang Lan's proposal.

"But specifically, what are you going to do?" The two girls were very curious, since this kid suddenly came up with this idea at this time, then he must have his own idea, right? Not a lot of words

"First of all, at the very least, it is a question of the final positioning of this aircraft. In other words, we define the plane as a toy for the rich, just as the rich will buy several supercars to show their identity, but they will never drive a supercar out when they travel, but in a luxury car. ”

"So, the plane should be a fun toy that makes them feel like it's worth the money, not so expensive that they shy away from it, but can fully provoke their desire to buy it. So I think $1.5 million to $5 million is a good price range, that is, depending on the configuration, the cost is between $1 million and $4 million. Of course, how much it will cost in the end, that's our question. ”…,

"Of course." The two girls nodded at the same time, this is for sure, under the premise of having enough price advantage, we must ensure that we have sufficient profits, which has always been one of the invincible magic weapons of Alice Group.

"The second is the exterior and interior. As a supercar. No matter what the real inside is, but a gorgeous appearance and interior and full of temptation of the human-computer interface must be there, as a 'fighter', it is especially necessary to pay attention to these problems, to make any place that people can see, make people feel that this thing is a symbol of identity and status, and buying this plane is not only a thing that has a lot of face, but also makes a lot of money! ”

"And we can't just copy this aircraft according to the structure of the MiG-21, but also make appropriate modifications. You can't just design this aircraft as an air sports car, considering that in many cases these families who buy this aircraft are collective, so you have to consider what to do when these families come out together? Although this plane is more for those rich people to use when fishing for horses. First of all, how to solve the problem of the take-off and landing distance of the aircraft? ”

Zhang Lan hit the nail on the head and pointed out the current problems of this aircraft. The take-off and landing distance of an ordinary model of private propeller aircraft is only about four or five hundred meters, but the maximum flight speed of Mach 2 of the MiG-21 fighter is obtained by sacrificing the wing load and wing lift of the aircraft, and the aircraft needs to be accelerated to a higher speed when taking off.

"There are two ways to do this, one is to increase the power of the engine, and the other is to increase the lift that the wing can provide."

"Let's leave aside the issue of increasing the power of the engine, let's talk about the lift that can be provided by lifting the wing. Under the premise that the main body mechanism of the wing of the army has been modified too much, I will redesign the wing shape of the wing to improve the lift of the wing," Alice frowned, "There will not be much of a problem, but the shape of the wing should change somewhat, but the cost should not change much." ”

As she spoke, Alice had already projected the three-dimensional design of the aircraft, and redrew the three-dimensional design in front of her, and soon, the shape of the previous wing had some subtle changes, according to the data displayed on the side, the new wing could provide lift without pushing down the shape of the wing

"Then there's no problem." Zhang Lan breathed a sigh of relief, what she was most worried about was that the cost of the aircraft would be greatly increased after the modification, as long as the cost would not increase too much, there would not be much of a problem. As for the change in the shape of the wings, from the world's first mass-produced MiG-21 to the latest MiG-21 improvement, how much has the shape of the evergreen of this Sky Warhawk changed?

So for this problem, Zhang Lan didn't care at all.

"But which one is the engine? The most fundamental reason why the cost of the J-7 fighter is so low is that the technology of the two turbojet engines used by this aircraft is very simple, so the cost of the engine is extremely low, and the cost of the entire aircraft has become extremely low, but if it is replaced by an advanced engine, the cost will rise terribly. Xiao Chenxi looked at the shape of Alice's modified wings, and frowned slightly.

"Although the lift that the wings can provide is much higher, the power of the engines is not enough, and the take-off and landing distance of the aircraft still needs to be almost 600 meters. This brings us back to the question I just mentioned. Improving engine performance and cost has become a difficult contradiction to reconcile. ”…,

"Of course, the engine must be replaced, the previous use of turbojet 7 or turbojet 13 is not only too low thrust-to-weight ratio, and fuel consumption is estimated that many people can't stand it, not only the thrust-to-weight ratio is low, but also the fuel consumption is too high, if possible, it is a good choice to replace the turbofan engine. As the main supersonic brand, it is still necessary to be able to fly at supersonic speeds, so under the premise of controlling costs, it is a good choice to use a conventional turbofan engine with afterburner. Dawn, among the existing fuel turbofan engines, can you design an engine with sufficient performance, but not very high fuel consumption rate, and low enough cost? Cost...... On the premise that the cost of the engine does not exceed 1 million US dollars, regardless of R&D expenses. ”

"I'm going to need to give it a try, and I'm not sure it's what I'm good at. However, my suggestion is that just as the same car has engines with different power depending on the need, we can also design several different engines for this aircraft. Before, we said that the price of our products covers from $1.5 million to $5 million, and if we can't show our technical strength on this, I'm afraid it's hard to get these guys to pay for these things. ”

This design solution? Admittedly, this is a very bold design that no one has ever done before, but considering that it is a proposal for the civil aviation market, it seems that the idea is starting to make sense.

"I'll leave the engine problem to me," Brother Tian, who had been in this channel but didn't speak, suddenly interjected, "This question is trivial to me, well, how about you take a look at this plan?" ”

As he spoke, Brother Tian projected the relevant information and simulation drawings of the engine he designed into front of everyone...... In fact, it was for Zhang Lan, a kid.

Depend on! I'm such a pig's head, I don't even need to put ready-made experts! Brother Tian's throat made Zhang Lan slap his head depressedly.

Tiange provides a series of engine design schemes, similar to the scheme of internal combustion engines for automobiles, the lift provided by the engine is arranged differently from low to high, and the cost is covered from 800,000 US dollars to 1.5 million US dollars, there are 3 models in total, the performance data of these three engines just designed by Tiange are much better than the data of the 7 and 13 engines that appear as a comparison.

"I think that since those guys who are willing to spend 5 million US dollars to buy this aircraft must be very rich, in order to make them willing to pay for their wallets, 350-5 million US dollars of this grade of aircraft, we can equip them with twin engines, the overall performance of the aircraft is more excellent, so that these guys can see the difference between themselves and others at a glance, the same is Kailongxuan, Kailongxuan 960 is definitely more respectable than 930, What we want to catch is the comparison psychology in the hearts of these guys. Brother Tian said endlessly.

"That's right," Zhang Lan's eyes lit up, why didn't I think of it just now?

Why don't you put a DVD or surround sound system on the plane? Zhang Lan is already beginning to ponder this question.

It's a great idea! At the same time, the eyes of Xiao Chenxi and Alice are also bright! Brother Tian's proposal is equivalent to providing them with a new window to look out.

"Since this is the case, on the premise of controlling the cost, we might as well be bolder!" Zhang Lan, whose thinking was let go, was a little excited, "Since our aircraft is made to order, we can have single-seater, tandem two-seater, side-by-side two-seater and 2+2 four-seat mode of tandem parallel hybrid mode seat arrangement mode according to customer requirements." Well, to equip the drop fuel tank to increase the range, of course, the drop fuel tank is optional. In addition, just like Tiange said just now, we can provide customers with two different engine configuration schemes of single engine and double engine according to customer requirements. ”……，