After expressing his opinion, seeing that the deputy head of the regiment in front of him still looked puzzled, or a little worried about his plan, Long Yun simply took the time to call Asimov aside and briefly told him his considerations.

When he was trying to figure out a way in the real world before, Long Yun thought very clearly, compared with the MiG-31 equipped with the D-30F turbofan engine, the MiG-25 using the R-15 series turbojet engine, although it strives for high speed and maximum flight speed is also better than the former, but it is still limited by the innate structure of the turbojet engine - for the jet engine that uses blade compression to provide combustion air support, after the flight speed is increased to a certain distance, the engine efficiency will drop sharply. This principle leads to the problem of zhì is basically unsolvable.

Because of this, the maximum speed that the MiG-25 has ever flown out, that is, Mach 3.2, can only be achieved occasionally, and it has to take considerable risks, and it is difficult to say that it is used in interception operations.

And the problem does not stop there, if we follow the traditional interception operation method of the Territorial Defense Force, when intercepting enemy aircraft, the interceptor plane will of course need to carry missiles; However, for any combat aircraft, even if only two missiles are hung on the fuselage, the center of gravity and aerodynamic center of the fighter will be changed, and the aerodynamic drag will also increase sharply when flying at high speeds.

The consequences of carrying missiles are reflected in the MiG-25 interceptor, that is, the fighter that could fly to Mach 3 or above can only operate in the speed range below Mach 2.8, and its maneuverability is also more restricted; However, if you forcibly increase speed and fly faster, the stability of the body's course will deteriorate, and there will even be a situation where the body will "hit horizontally", so it is easy to lose control and crash directly.

Since missiles don't work. Long Yun had planned to use an aerial cannon before. But the question is whether the MiG-25 will be able to catch up with the amazingly fast "Blackbird"?

This is a crucial issue that has a bearing on the success or failure of an interception operation. The MiG Design Bureau in the parallel world couldn't give an answer, and everyone present couldn't answer for Long Yun; A qiē's ideas and decisions need to be completed by himself.

……

In the next two days, the technical force of the 290th regiment, the technicians sent from above, and even the senior technicians temporarily transferred from the production enterprise, all of them hurried to implement the modification under the command of Long Yun.

In the fighter maintenance workshop of the Alarsk base, where the conditions are simple and the equipment is not very complete, Long Yun led his capable technicians and ground crew pilots to use the design blueprint and maintenance manual of the MiG-25 series fighters as a reference. According to Long Yun's design drawings and dictation, the Blue 08 MiG-25PD was redesigned quite thoroughly.

What does it take for an already fast fighter to make him fly faster?

The first step is naturally to reduce weight, mainly to maximize maneuverability and reduce fuel consumption during climb acceleration; To this end, the pilots first dismantled all the on-board equipment that was not necessary for the flight, including the radar and fire control system, the RWR warning system, the jamming bomb launcher and the supporting warning device. In addition, all weapon pylons, as well as internal parts such as the flat tail control system that are not needed, have also been removed.

In the second step, in order to improve the stability of the fighter's course, that is, to ensure that the center of gravity is located before the aerodynamic center, the pilots modified the fighter's fuel system so that it only uses the fuel tank located at the front of the fuselage, and further removed and moved all the on-board equipment that can move the position to the premise; In addition, the aileron position was locked to prevent it from getting out of control, and the fighter was replaced with two larger pelvic fins.

At last. On the basis of the changes to the airframe, the pilots also installed two GSH-25 guns under the cockpit where the electronics were originally housed on the MiG-30PD. This position was determined by Long Yun after repeated consideration, which would not lead the engine to stop because of the shot, and could easily allow the warhead to penetrate the air shock cone when flying at supersonic speeds.

After such a temporary emergency modification, in just two or three days, a brand-new MiG-25PD on standby has been prepared and ready to carry out the interception mission in the air.

According to Long Yun's estimates, the weight of the modified Blue 08 MiG-25PD is much lighter than that of the standard volley, coupled with a number of R-15BD series engines in the best condition provided by the brother troops, and referring to the research results of the high-speed operation of turbojet engines in the real world, Long Yun believes that the "Iron Clipper" in front of him is still quite sure of the practical speed of Mach 3.2 or more when flying to an altitude of more than 24,000 meters.

Mach 3.2 above, what does that mean?

It means that at an altitude of more than 20,000 meters and close to 300 meters per second, the speed of sound will reach more than 3,000 kilometers per hour, in other words, the "Blackbird" that can surpass the cruise reconnaissance state will catch up and attack from the rear!

The sharp knives are ready, and now they are waiting for the "Blackbird" to come to the door.

With a sharp blade against the "Blackbird", Long Yun, who was dormant in Aralsk, had been listening to the news of the homeland air defense network for the next few days, and he was waiting for an opportunity.

The battle that took place at an altitude of nearly 30,000 meters makes people's blood boil when they think about it, doesn't it?

Long Yun, who was waiting for the rest of his life, sometimes remembered to sing a very funny pop song -- the lyrics of "almost approaching a distance of 30,000 feet" -- which sounded extremely lofty, but in fact it was less than 9,000 meters when converted, and even the troposphere had not yet emerged.

But it's no wonder that the person who fills in the lyrics, the civil airliner is just like that; Not to mention the general public, even if it is an elite fighter pilot in the Air Force, how many people can have the opportunity to fly a fighter plane to an altitude of 30,000 meters and compete in a peak duel?

Not to mention the pilot's skills, ordinary fighters can't climb that high at all, and the opportunity is rare!

For the unscrupulous "Black Bird" who has repeatedly entered the country for investigation, as well as the mysterious driver above, Long Yun has already been gearing up. The reconnaissance planes that have been invading intermittently for several days have been far from Aralsk and do not meet the conditions for interception by the MiG-25PD that took off half-oil; But as if there was a certain number in the dark, this fateful battle did not make him and his steel mount wait too long.

It was another dark moonlit night, and at 2:20 a.m. after midnight, a slight alarm sounded to wake up Long Yun, who was napping in the duty room.

With the call of the liaison officer in the headset, the automatic interception and guidance network covering the vast territory of the Soviet Union sent a message that it was found that the suspected SR-71 "Blackbird" had entered from the south of Tajikistan, with a course of 300, an altitude of 26,000 meters, and a speed of about 3,200 per hour, and was expected to reach the airspace near Alar in 30 minutes!

The alarm is an order, and while beckoning the ground crew to start the blue 08 engine that is on standby at any time and prepare for liftoff, Long Yun, who has already put on a high-altitude anti-load suit, grabbed his flight helmet and quickly got on the battery car and rushed to the fighter at the end of the runway.

Climbing into the cockpit to take over the pilot's system self-check, the MiG-25PD, which had already removed a large amount of equipment, had no electronic equipment to test, he first confirmed that the radio guidance system was working properly, the oxygen and compensatory functions were working normally, and then tested the aerodynamic surfaces such as the flat tail and the vertical tail; As soon as it was ready, it began to release the brakes to accelerate, push the throttle valve forward to the top and turn on the afterburner, the huge steel monster roared into the dark sky of midnight, and the bright afterburner made the fighter plane that climbed and flew away as dazzling as a rocket!

In the deep night sky, the light of the MiGs accelerating away is so conspicuous that they can be seen by the people at the airport even after flying far away.

Blue 08 MiG, Longyun landline, attack!

The MiGs drove through the night sky at a rapid pace, climbed with all their might after takeoff, and then accelerated to break through the sound barrier, and Long Yun continued to pull the rod to maintain the angle of attack, that is, to accelerate the climb.

With the experience of previous interception failures, this time the control and battle plan were obviously much better, and while maneuvering the fighter to accelerate towards the target airspace, he carefully used the guò navigation system to repeatedly confirm the fighter's route. Since the MiG-25PD fighter that is now being piloted no longer has a radar, even if the high-temperature exhaust characteristics of the "Blackbird" are too obvious, Long Yun will not be able to see it at all at the current distance; Therefore, he could only listen to the command signal from the ground guidance station, estimate the position of the "Blackbird" according to the limited instructions that came, and strive to stealthily approach and then launch a fatal blow.

I found that the control in my hand had become a little heavy, and while receiving ground guidance, I glanced at the airspeed counter, and the speed of the fighter plane had reached about Mach 2.0, with an altitude of 19,000 meters!

Seeing the fuzzy navigation information on the display screen, Long Yun thought to himself that the guy was flying really fast: it had only been twenty minutes since the alarm sounded, and the ground guidance system told him that the "Blackbird" had approached the city of Orda, southeast of Aralsk, and the distance between friend and foe was only about 200 kilometers.

According to the predetermined engagement strategy, the ground guidance station used long-range warning radar and three-coordinate radar to determine the position of fighters in the airspace, and at the same time issued a command message to guide Long Yun's MiG-25PD to the T-shaped route of standard tail pursuit interception. Flying on the virtual T-shaped vertical track in the air, Long Yun accelerated and climbed high steadily, while opening the shield fan to cover the already dim instrument light in the cockpit; As his pupils gradually dilated to the limit, he finally saw a bright spot in the dark night sky in front of him after a seemingly long search.

It flickered like a ghost fire, and the visual distance was still twenty kilometers away, it was the tail flame of the "Blackbird"!

With his extraordinary eyesight and careful observation, Long Yun used the naked eye to identify the flight trail of SR-71 from the night sky; Reconfirm that he is now approaching it at right angles, and it seems that the ground guide is working very well this time.

When formulating the battle plan before, Long Yun had set the strategy of approaching in a T shape and then chasing the attack, he didn't want to alert the guy in the "Blackbird" because of the tail flames like a torch, and from the opponent's flight attitude, it was obvious that he had not noticed himself approaching silently.

But even so, Long Yun was a little nervous and sweaty, and he reminded himself that he must be calm, calm again! (To be continued......)