But to be honest, what Yang Hui said is very reasonable, but the medicine is bitter, it depends on whether Wang Changqing, as the chief engineer, can listen to it, after all, this is the first large-scale project of the chief teacher, if he really can't do outstanding results, maybe he himself will be embarrassed. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

And Yang Hui can also see that Wang Changqing is still very entangled in his heart, or he is struggling in various ways, he must have made various measurements of what Yang Hui just said, it is definitely impossible to say that there is no idea, but in the end, it must be admitted that the first task now is indeed to complete the localization of the Su-27, and the Su-27M proposed by the army is only a medium and long-term indicator.

At this time, the problem is very embarrassing, Wang Changqing, who needs to be the chief designer, to make a difficult choice, it is a critical moment to measure the ability level of a chief designer, if the decision is correct, it is naturally fame and fortune, if it fails, it is just a failure.

It was also after a difficult psychological choice that I had some preliminary thoughts: "That is to say, our J-11 wants speed, then I think that the three-wing surface aerodynamics, vector thrust and the like can choose to give up for the time being, whether these two technologies are our Republic or Maozi themselves, I am afraid that everyone has not figured it out, so the risk is a little too great." As for the rest, I think you can try it first, and then we can use the technical level in China. ”

For this more acceptable statement, it must have been evaluated somewhat, at least radar, glass-based cockpit and avionics, and even three-axis and four-redundancy flight control hardware can be done, these are domestic supporting suppliers cultivated by AVIC Southwest for many years, and the ability is still very good.

And the above three technologies do greatly improve the combat effectiveness of the J-11, it belongs to the kind of improvement measures with small investment and quick results, even if the chief engineer of AVIC Southwest makes the choice, he will probably make the same trade-off, so Yang Hui wants to give a positive answer.

"It's very reasonable, it's true that the design of the three wings is not too necessary, as for the engine, I think it's okay to use the Al-31F engine used by the Su-27 directly, and the full-authority digital control is not too necessary, and if that thing is not good, it is a major design flaw, so let Maozi himself be the guinea pig."

For the J-11 engine, this is completely unnecessary in Yang Hui's opinion, anyway, I don't plan to really fire the integrated design of flying push, what to do with the engine control system, as long as it is based on the basic use needs, it is enough.

As for whether the thrust of the 31F engine is enough, there is no need to worry too much, after the new radar is replaced, compared with the old 1-ton Su-27 original radar, at least 400 kg of weight can be reduced, and the flap phased array radar may occupy the weight of the 400 kg of weight reduction.

But it is absolutely impossible to reduce the weight of the J-11 just the radar, at least Yang Hui believes that after the new avionics system is installed, the weight reduction of the entire avionics on the Su-27 can be greatly improved, and then the weight reduction can be directly used to strengthen the airframe structure, and it must be as required by the Su-30MKK imported by the previous republic, at least you can not continue to carry the hypochondriasis.

As for the weight of the J-11 fuselage that has been improved in this way, it must still be the same as the early Su-27, and there will even be some exceedance, and the increase in the maneuverability of the fighter will not be too large, and how much maneuverability can such a J-11 fighter be improved, and is the Air Force willing to accept such a fighter?

In fact, this is very easy to do, first of all, you must know a point, the maneuverability index of the fighter is not only related to the thrust-to-weight ratio of the whole aircraft, you have the same thrust-to-weight ratio of the whole aircraft, in terms of the same mobility requirements, the safe flight envelope range is also a major element of the fighter maneuverability index.

The reason why the F-14 is awesome is not because of how good its maneuverability is, but because its safe flight envelope range is large enough under high maneuverability, whether you have subsonic, transonic speed, supersonic speed, or low, medium and high airspace altitudes, people can show good maneuverability.

Maybe your Hornet's low-altitude subsonic performance is excellent, but the F-14 will definitely not be too weak, and when it comes to medium and high altitudes, the F-14 can still ensure that the maneuverability will not drop significantly, and the Hornet can only cry without tears, and this is the importance of the flight envelope.

The flight envelope gap between the F-14 and the Hornet is caused by the difference in aerodynamics and flight altitude, but it is definitely not only the aerodynamics and altitude that affect the flight envelope of the fighter, but also the speed, maximum allowable overload, and the weight of the whole aircraft are also a big influencing factor.

Since the speed and maximum allowable overload can also directly affect the envelope data of the aircraft, then this time according to Yang Hui's idea of structural reinforcement of the J-11, perhaps the maneuverability of a small part of the envelope range of the J-11 aircraft has not increased much, but the J-11 fighter after structural reinforcement can at least overcome some transonic traps of the Su-27 series.

For example, with the Su-27 fighter limited to 23 tons, when the speed of the aircraft is below Mach 0.85, the usable overload is 8g, and between Mach 0 (transonic speed), the maximum allowable overload is sharply reduced to 5.5g, and when it is above Mach 1.25, it returns to 6.5g.

The above is the famous Su-27 side fighter transonic overload trap, 23 tons corresponds to 5 tons of oil plus two R27 missiles plus two R73 missiles, and even the Su-27 can only pull out an overload of 0.85G below Mach 9 under the weight of less than 19 tons of the whole aircraft, and at this time, the overload of each Mach range can be increased by 1G, but even if the 6.5G transonic flight overload is actually not a good data.

The above is why it is often heard that the Su-27 has 9 tons of super-large internal oil, but it is often not in a full state, this is not that the Air Force is unwilling to be full, but that the Su-27 is full of oil after its cartilage, this kind of full oil situation, even if it is only two in two close to the plug-in, it is already up to 27 tons of weight.

Think about the weight of this 27 tons is 4 tons more than the normal take-off weight of the previous 23 tons, and the transonic overload at 23 tons is only 5.5g, and think about what level the transonic overload will rot to when it is 27 tons, it is simply unbearable to look at it directly.

Correspondingly, the F-15 fighter is not as large as the Su-27 because of its empty weight, and the fuselage structure is relatively stocky, so most of them have achieved the design requirements of the full envelope range of 9G overload, of course, it was later revealed that the F-15 has some flight envelope overload is limited to about 7.5G.

But this 7.5g overload, which is also out of reach of the hypochondriatic Su-27, unless you are willing to sacrifice the empty weight to strengthen the airframe structure, it is possible to increase the transonic overload of the Su-27 series from 5.5g to 6.5g or 7g, and the flight envelope range of the J-11 can definitely be greatly improved.

After you add the digital fly-by-wire flight controller, not to mention the 20% relaxation of static stability like the Su-27M, a 10% relaxation can always be achieved! Coupled with the increase in the allowable overload after structural reinforcement, the J-11 at this time can be regarded as a qualified heavy fighter, a real long-legged heavy air superior, and even if it flies to the Yellow Sea with long-distance internal oil, it can also drink a pot with the F-15/16. (To be continued.) )