Hongdu pulled out the design of the reduced version of the Su-27 fuselage this time, and used the F14's titanium alloy variable swept wing receiver, no matter how you look at this thing, it is quite an ideological design.

Not to mention anything else, after the fuselage adopts the Su-27 design, the internal oil load of the fuselage (not counting the wing fuel tank) is much stronger than other designs, which will definitely not lose to the Southwest Science and Industry Program.

This alone can pose a strong threat to the Southwest Science and Industry Program, and Yang Hui had to sigh with emotion at this time.

Chief Master Lu really deserves to be a legendary-level chief teacher, and they all say that Hongdu's design has always been a design full of spirituality, and after seeing it this time, it really deserves its name.

Chief Engineer Lu is also quite confident in the plan he brought this time, and it is quite advantageous to use the design of the variable sweep wing to make this combat attack aircraft.

The full-altitude flight adaptability brought by the variable swept wing, it has the Tornado and MiG-27 when it is used as an attack aircraft, the MiG-23 when it is used as an air superiority fighter, and the F14 when it is used as an interceptor, which is simply an all-round airfoil design.

And the combat attack aircraft project to be tendered this time happens to be the specialty of the swept wing, so this Hongdu can really win this project?

Chief Engineer Lu went to the model on the stage again, stroked the model, and then began to introduce the specific details.

"The plan we brought this time is designed in strict accordance with the technical and tactical indicators of the army, and we have prepared five external auxiliary fuel tank designs for this plan for the 4,200-meter transfer range."

Chief Lu's design scheme is also quite crazy, although it adopts the Su-27 fuselage design, but due to the use of variable swept wing design. The wing fuel tank, which accounts for half of the Su-27's internal oil, will definitely not be used on the variable swept wing.

Under such a design. Hongdu was asked to find other ways to extend the range with a fuselage design like the Su-27. It must be impossible to put a conformal fuel tank on the whole.

So our Chief Lu also went crazy, isn't it the range of 4200, I'll just add an external fuel tank, anyway, it's just a transfer voyage, five external fuel tanks are enough!

So there is a crazy design of Chief Lu, a fuel tank is hung on the central axis of the fuselage, and two auxiliary fuel tanks are hung on the left and right under the variable-swept wing receiver, which is learned from the F14, and the other two auxiliary fuel tanks are frantically installed under the wings of the variable-swept wing.

"Five-body fuel tank design. Three of the auxiliary fuel tanks are designed with conventional anchor points, and the other two auxiliary fuel tanks are designed under the wings, using the MiG-23 auxiliary fuel tank design scheme. ”

The design scheme of the MiG-23 auxiliary fuel tank is to hang the auxiliary fuel tank symmetrically under the variable wing, and the orientation of the pylon is designed to be frontal forward according to the wing 47-degree sweep angle.

The design scheme of the auxiliary fuel tank of the MiG-23 is actually a compromise scheme, usually the take-off stage of the variable swept wing is the first small grazing angle state, at this time the auxiliary fuel tank of the MiG-23 is at a large angle with the center line of the fuselage, which will bring greater aerodynamic resistance. Naturally, it is not conducive to the take-off of fighters.

But according to the MiG Design Bureau: when the aircraft takes off, the drag brought by the auxiliary fuel tank is tolerable, after all, there is no need for maneuvering during the take-off phase, plus the excellent low-altitude take-off and landing performance brought by the minimum sweep angle of the variable sweep wing. It's all tolerable.

The aircraft entered the cruising state after takeoff, and the MiG-23 in this cruising state was based on the optimal sweep angle of 47 degrees.

At this time, the MiG-23 auxiliary fuel tank is parallel to the center line of the fuselage, and will not produce additional resistance. And by the time it flew into the operational airspace, almost all the auxiliary fuel tanks had been exhausted. Just drop it directly.

Although it is possible that there will be an encounter along the way, it doesn't matter what kind of plane it is. When you are intercepted, you have to throw away the auxiliary fuel tank, so there is no need to worry.

Overall, the design of the MiG-23's variable-wing underwing drop fuel tanks was a fairly successful engineering design, increasing the range of the MiG-23 at a relatively small cost, while also freeing up hardpoints for mounting combat weapons.

For such an excellent design, how can Hongdu not use it, Hongdu factory still has the finished MiG-23 there, just need to study it......

The design ideas of the auxiliary fuel tank from the MiG-23 are copycated, and as for the angle of the underwing auxiliary fuel tank of the Hongdu program, it depends on the subsequent test flight data.

Regardless of the fact that the Hongdu plan adopts the MiG-23 auxiliary fuel tank mounting design, anyway, the current Hongdu has indeed produced five external auxiliary fuel tanks.

To say that the crazy design of such five auxiliary fuel tanks seems to be a plan that only the French had when they designed the Rafale, but now Hongdu has also designed such a thing in order to meet the perverted range requirements of the army.

"Through the design of five auxiliary fuel tanks, according to the engine data given by the army, our scheme can achieve a maximum transfer range of 4,200 meters."

Seeing Chief Engineer Lu introducing this design with a smile, Yang Hui didn't know what to say, and it was quite remarkable that the variable swept wing design scheme could achieve such a range.

The army and the Science and Technology Commission are also quite satisfied with the plan of Hongdu this time, to say that the plan of the previous 611 Institute is to accompany the role of the prince, don't care too much, but this time the Hongdu plan must be taken seriously.

"The plan is pretty good, I calculated, under the design of this plan, in addition to the special hardpoints for the auxiliary fuel tank under the wings, there can be five hardpoints, and these hardpoints are heavy-duty hardpoints, which is enough to meet the general ground attack."

Commander Liu began to evaluate Director Ding on the side, for this Hongdu plan, the army still found it very interesting, and even made up its mind many years ago not to worry about the variable swept wing fighter, and at this time began to loosen the seal.

Director Ding of the Science and Technology Commission is naturally well-informed, and he still has a very good understanding of this variable swept wing technology, and he also added two sentences to Commander Liu's words at this time.

"This is not all, if Hong Du takes a good look at the design scheme of the two hardpoints under the variable-swept wing receiver of the American F17, you will find that these two hardpoints can be designed as composite hardpoints, so as to add two hardpoints again, and there is no problem with hanging two fighting bullets on these two hardpoints."

Since the Hongdu plan is a copycat of the F14 titanium alloy casing design, the strong mechanical properties of the titanium alloy casing can not be wasted.

The Americans can design these two hardpoints into composite pylons, why can't the Hongdu Factory also learn to play together, it's impossible for your fighter-attack aircraft not to hang two combat bombs!

The air combat capability of the flying leopard on the previous face still needs to be equipped with two wingtip combat bombs, not to mention the Hongdu plan, which is theoretically more capable of air combat this time.

"That's right, if you can learn from the Americans, and then design two fighting bomb hangers, it will naturally be the best design, but it's still a pity! It looks good in every way, but it's just ......"

The army still feels a little pity, after all, there are still some small flaws in this Hongdu plan, and if this small flaw can be improved, it will be perfect......

Director Ding can't stand the army's pursuit of perfection anymore, and now that Hongdu has designed it like this, it is definitely quite excellent and dedicated.

"I can't say that, Hongdu's plan this time is definitely quite excellent, in my opinion, this aerodynamic design is definitely more than one level higher than the wind."

Hearing that the Science and Technology Commission compared the Tornado fighter, which was also used as a combat attack force of the variable swept wing, with the Hongdu plan, Commander Liu also nodded in agreement.

"That's right, this Hongdu plan is indeed much stronger than the wind, whether it is the most important anchor point in the ground attack, or the air combat performance of the air combat, the wind will fall down." (To be continued.) )