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 M60 projects, so his prestige within the 603 institute was still not high. questionable.
Since he said this, the others below naturally no longer have any worries and began to think about how to adjust the parameters of the aircraft 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 pure 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 ultrlow-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 responsible for assisting Tang Changhong in the overall design of the overall plan 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.”
Hold a technical seminar and hold a group meeting for graduate students.
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.”
“Borrowing ideas, but not copying them.”
“The person to be sent to study…”
People are interested in this kind of gossip content.
Obviously, the name Chang Haonan is somewhat legendary in today's aviation industry system.
“Who else could it be? It must be Mr. Chang Haonan. If you calculate the time, it should be right...”
"in addition…"
“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 83 Project!”
“When I went to the 601 Institute on a business trip last year, I saw some J-8C wing design information. I think it can be used as a reference.”
"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 excellent.”
However, in the end, he lowered his voice and continued:
Once the first person speaks, the others will follow naturally.
“Hiss…if that's the case, you can really consider sending someone to study.”
“Every interceptor aircraft is designed with low-altitude performance in mind. It would be a huge disgrace if our fighter-bomber failed in this aspect..."
When speaking of this, 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?"
“Mr. Xiao Chang? It's...”
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:
At this point, he paused slightly, as if he was hesitating whether to continue.
Another old designer with gray hair on his temples who looked much older than Tang Changhong continued on the topic of the wings:
“When Mr. Chen designed the aircraft, in order to reduce the risk of research and development, he chose a relatively conservative airfoil, which resulted in the overall flight performance being average.”
Seeing that the topic was getting a little off track, Yang Lin, a senior engineer responsible for the design of airborne weapon systems, tapped the document paper in front of him with the cap of his pen:
“Speaking of ultrlow altitude penetration.”
"The Air Force's ultrlow-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 PRNK-23K that can adapt to low-altitude environments. The identification and tracking systems lack existing models...” ˆ ˆ ˆ “As a result, whether it is flying or attacking, we are under great 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.”
Gong Xinmao, the deputy chief designer in charge of flight control system design next to him, added a sentence, which was barely comforting.
Immediately afterwards, he expressed his thoughts:
“Can we consider using the search radar on the nose of the aircraft to track the terrain, combined with the sled method or the adaptation angle method to achieve terrain matching tracking?”
"The performance of the 232H fire control radar on the old JH-7 is definitely not good enough, but the 1473 now developed for the third-generation aircraft or the 1472 radar used on the J-8C should be able to meet the requirements. Anyway, it is not needed for ultrlow-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 was for anti-aircraft purposes, it is not difficult to add a youth version of the terrain tracking function to it.
After all, it only requires collision avoidance, and it does not say that the terrain must be completely mapped.
However, Yang Lin, who has dealt with weapon systems more often, immediately rejected this idea:
“It's possible to fly this way, but low-altitude penetration is originally about concealment. At this time, it's not appropriate to turn on the nose radar in a big way... I'm afraid it's not appropriate?”
“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 for ground-attack missiles is unlikely to have room for a third pod.”
Seeing that the atmosphere at the scene was a little too lively, Tang Changhong quickly calmed down the scene:
"Comrade Xin Mao was right just now. After all, the JH-7A has two pilots, and the pressure during normal flight at ultrlow 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 basic JH-7 pilots, what they are most worried about is actually a sudden power failure during low-altitude flight.”
“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 10 prototype. After discovering the risk of surge, we It will restrict the aircraft from continuing to make 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 locations under the aviation industry system have been transformed into groups with branch company attributes, and there is some competition between them, in the final analysis, it is still a game of chess for the whole country.
With such important technology, it is impossible to hide it and only use it 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 time to respond as fighter jets.
Coupled with the relatively ordinary ejection escape system of the JH-7, it can easily lead to a first-class accident involving aircraft crash and fatality.
If surge can be detected and suppressed in advance, or even just delaying the occurrence of surge, it will be of great benefit to flight safety.
So he immediately stood up and solemnly expressed his position:
“Yes! I will definitely learn this technology and bring it back!”
(End of this chapter)
Chapter end
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