Chapter 537 JH-7A, heavier, farther and safer

Although Tang Changhong served as the chief designer for the first time, he had previously served as a subsystem designer responsible for important research and development content in the JH-7 basic model and MA-60 projects, so his prestige within the 603 institute was still not high. questionable.

Now that he said so, the others below naturally no longer had any worries and began to think about how to adjust the aircraft parameters so as to better adapt to the combat ideas of the new era and not waste the two engines with huge performance improvements.

Seeing that everyone had unified their thoughts, Tang Changhong continued to add:

"This time, the users of the JH-7 have expanded from the navy to the navy and air force. The latter also provided us with a project fund and required the aircraft to have the ability to conduct ultra-low-altitude penetration and use precision-guided weapons."

"Users have put forward new requirements, so we also need to make some targeted upgrades to the aircraft's functions."

After a brief silence, a young engineer who was responsible for assisting Tang Changhong in the overall design spoke first:

"Since the performance of the new engine is so much better than that of Spey, the wing area and strength can be slightly expanded. The old model JH-7 can only carry two YJ-81 anti-ship missiles. This efficiency is too low. .”

"The navy faces fewer targets, so the problem may not be too big, but the air force may have to attack multiple targets at one time, and the low ammunition carrying capacity will definitely reduce combat efficiency."

Holding a technical seminar is actually similar to holding a group meeting for graduate students.

Once the first person speaks, the rest will become more natural.

Another old designer with gray hair on his temples who looked much older than Tang Changhong continued on the topic of wings:

"When Mr. Chen designed the aircraft at that time, in order to reduce the risk of research and development, he chose a more conservative wing type, which caused the overall flight performance to be more average."

"When I was on a business trip to the 601 Institute last year, I saw some J-8C wing design information. I think it can be used as a reference."

When this was said, someone immediately expressed doubts:

"J-8C...isn't that an interceptor? It's also a delta wing. It doesn't match our aircraft at all, right?"

"Learning ideas, not copying them."

The old designer stretched out his fingers and tapped the table in front of him, as if to emphasize what he was going to say next:

"The finalized J-8C adopts the idea of ​​integrated design of leading edge slats, main wings and trailing edge flaps, which can avoid the simultaneous occurrence of mixed boundary layer and flow separation when the flap slats deflect at the same time. Although it is a large delta It's a wing-less interceptor, but its low-altitude lift and maneuverability are very good."

"Every interceptor aircraft has given full consideration to its low-altitude performance. If our fighter-bomber failed in this aspect, it would be a huge disgrace..."

"in addition……"

At this point, he paused slightly, as if hesitating whether to continue.

But in the end, he lowered his voice and continued:

"In addition, I also heard from people over at the 601 Institute that the leading edge slat structure of the J-8C was the first change that Mr. Chang started to complete after he joined the Project!"

People are interested in this kind of gossip content.

"Mr. Xiao Chang? Yes..."

"Who else could it be? It must be Mr. Chang Haonan. If you calculate the time, it should be right..."

Obviously, the name Chang Haonan is somewhat legendary in today's aviation industry system.

"Hiss... If that's the case, you can really consider sending someone to learn."

Someone immediately expressed his position clearly:

"When Mr. Chang was here to revamp the JH-7, I was fortunate to work under him. According to Mr. Chang's work style, when designing things, he will definitely leave behind a whole set of methodologies. Let's learn from them. You can definitely get twice the result with half the effort.”

"The candidates sent to study..."

"..."

Seeing that the topic was a little off track, Yang Lin, a senior engineer in charge of airborne weapon system design, tapped the document paper in front of him with the cap of his pen:

"Speaking of ultra-low altitude penetration."

"The Air Force's ultra-low-altitude penetration is different from that of the Navy. The environment is much harsher. Our country currently does not have low-altitude comprehensive navigation equipment like the US military's AN/AAQ-13, or even targets like the PRNK-23K that can adapt to low-altitude environments. Both identification and tracking systems lack existing models..."

"In this way, whether it is flying or attacking, we will face a lot of pressure..."

"Looking on the bright side, the JH-7 has two pilots who can be responsible for flight and attack respectively, so the pressure is not as great as the pilots of the MiG-27 or F16C."

Next to him, Gong Xinmao, the deputy chief designer in charge of flight control system design, answered, which was barely comforting.

Immediately afterwards, he expressed his thoughts again:

"Can we consider using the search radar on the nose of the aircraft to track the terrain, and combine it with the sled method or the adaptation angle method to achieve terrain matching tracking?"

"The performance of the 7H fire control radar on the old JH-232 is definitely not good enough, but the 1473 now developed for the third-generation aircraft, or the 8 radar used on the J-1472C should be able to meet the requirements. Anyway, it is not needed for ultra-low-altitude penetration. Go to the radar to search for targets.”

As a flight control designer, this is obviously the most direct method he can think of.

Although the original design of the 147x series radar is for anti-aircraft purposes, it is not difficult to add a youth version of the terrain tracking function to it.

After all, it's just a requirement to avoid collisions, and it doesn't say that the terrain must be completely mapped.

However, Yang Lin, who has dealt with weapon systems a lot, immediately denied this idea:

"It's possible to fly this way, but low-altitude penetration is originally about concealment. At this time, turning on the nose radar in a big way... I'm afraid it's not appropriate, right?"

"The emission angle of the nose search radar is too large. If there is another enemy aircraft in the sky, wouldn't everything be exposed when the radar warning receiver goes off?"

"Is there a better way? It is definitely not possible to integrate terrain tracking radar into a pod at present. Moreover, since users require the use of precision-guided weapons, they also need to consider carrying a laser-guided pod and an airborne The data transmission pod used for ground-attack missiles is unlikely to have room for a third pod.”

"..."

Seeing that the atmosphere at the scene was a bit enthusiastic, Tang Changhong quickly calmed down the scene:

"Comrade Xinmao was right just now. After all, the JH-7A has two pilots, and the pressure during normal flight at ultra-low altitude is relatively not that great. Therefore, compared to the automated low-altitude navigation pod, we still have to pay attention to the most basic flight safety issues."

"According to feedback from pilots of the basic JH-7, what they are most worried about is actually the sudden power failure when flying at low altitudes."

“In terms of flight safety, I remember that the Chengdu 611 Institute used a technology that could predict engine surge in advance based on the air intake conditions during the testing of the Project prototype. After discovering the risk of surge, we This will restrict the aircraft from continuing to perform violent maneuvers and avoid the risk of surge."

"Comrade Xinmao."

Tang Changhong looked at his deputy chief designer next to him:

"I have contacted Chief Engineer Song Wencong and Chief Engineer Yang Wei of the 611 Institute. They agreed that we would send a team of technicians to inspect and study. I am going to let you lead the team and stay in Chengdu for a while."

Although various places under the aviation industry system have been transformed into groups with branch offices, and there is some competition between them, in the final analysis, it is still a game of chess for the whole country.

If you really have this important technology, you can't hide it and use it only for yourself.

Gong Xinmao was stunned when his name was suddenly called.

This technology sounds too good to be true.

Especially for fighter-bombers that mainly fly at medium and low altitudes, once surge occurs, they often do not have as much response time as fighter jets.

Coupled with the relatively ordinary ejection escape system of the JH-7, it can easily lead to a first-class accident in which the aircraft crashes and people are killed.

If surge can be detected and suppressed in advance, or even just delaying the occurrence of surge, it will be of great help to flight safety.

So he immediately stood up and solemnly expressed his position:

"Yes! I will definitely learn this technique and bring it back!"