Chapter 553: Bricks fly with great force, stacked armor!
"The second improvement suggestion for the Il-28 copy is to stop using the LYP-5 turbojet engine in the copy process and directly install the LYP-6 turbojet engine currently used in the Z-6 fighter."

This suggestion actually came from an improvement on the Z-5 seen in the previous life. The LYP-6A engine was used to replace the LYP-5. While the thrust was greater, the engine diameter was reduced from 1.2 meters to less than 0.7 meters, and the weight was reduced by nearly 300 kilograms.

However, that improvement was ultimately unsuccessful because the engine cooling problem could not be solved.

But here, this problem is not a big deal, because this LYP-6 is not that LYP-6, the materials are different.

Compared with the GH591 alloy originally used in LYP-5 and LYP-6, the 33 high-temperature alloy here can operate for a long time at 1100℃-1250℃, while the latter can only have sufficient high-temperature strength at 700~750℃. Compared with the high-temperature strength, its oxidation resistance is better, 900℃.

就算是后来LYP-6甲使用的自研GH135合金，其长期工作温度也不如591，约为980℃。这个GH135是LYP-6甲推力大幅提升的功臣，但还是扛不住。

However, compared with 591, the difference between the two is not as great as heaven and earth, but at least the difference is obvious.

Therefore, this new LYP-6 is actually very suitable for the modification of Il-28.

"Performing such a major surgery? Isn't it a bit too radical?" Everyone had some doubts.

Gao Zhendong wrote down several models on the blackboard and explained them one by one.

"With the discontinuation of the production of the Zhan-59 in 5, there is no main target for the LYP-5 engine. Moreover, from a technical point of view, the LYP-5 is backward compared with the LYP-6 of the same level. There is no need for us to maintain the production of two engines with similar thrust levels."

The comrade from the Air Force thought about it, nodded, and felt that there was some truth in it.

Gao Zhendong drew another line under the LYP-6 on the blackboard: "And there is another key point. The current LYP-6 thrust far exceeds the LYP-5. They are already two levels of engines. Replacing with LYP-6 can make the Z-5 have a larger load and a longer range. And more production quantities can also effectively dilute the production cost of LYP-6."

After saying that, he wrote numbers under several models and compared them one by one.

The LYP-5 has a military thrust of 25.5 kN and an afterburner thrust of 32.5 kN. Its afterburner thrust is slightly higher than that of its copycat LYP-6, at 1 kN, but its weight, diameter, and thrust-to-weight ratio are much worse than its copycat LYP-.

重量重40%，直径大了90%，推重比却是3.4对4.5，小了差不多1/4。

Compared with the LYP-6 in this world, it is even more backward. Thanks to the efforts of Mr. Wang and others from the Northeast Aerospace Engine Research Institute, the LYP-6 that was finally finalized in this world is similar in other aspects, but its thrust is much higher than the 6 kN afterburner thrust of the LYP-36.8A that Gao Zhendong had seen in his previous life!

估计是综合考虑到寿命等参数，没有高振东前世看到的70年为战-12配套LYP-6B加力推力43.7千牛那么夸张，但是还是达到了军推31.5千牛，加力推力40千牛这条线，推重比从仿制对象的4.5一举增加到5.5以上。

To put it in an exaggerated way, this thing can even make the Z-6 reach supersonic speed without afterburner.

The force is so great that bricks can fly. It's nothing more than this.

However, this is the latest data that Mr. Xiao of the China Aviation Industry Corporation has just obtained. This latest engine was just completed by the Northeast Aero-Engine Research Institute and has not yet been used on the Z-6. The engine used in the Z-6 is still slightly conservative.

The comrades in the Air Force knew that the LYP-6 engine was much more powerful than the copycat, but they did not realize how much more powerful it was. When they looked at the data comparison on the blackboard, their heads suddenly became excited and they wanted this one, this one!
"And this modification is actually not difficult. When the engine connector used for heavy loads is used for light loads, it is relatively easy to improve it."

This conclusion comes from the Il-6 that was modified into LYP-28A in the previous life. The engine modification of that aircraft was successful, and the problem lay with the engine itself.

The comrades in the Air Force were just about to shout "Great!"! Greater thrust, lighter weight, less drag, and not too difficult of a modification. Even if this plane is still to be used as a bomber, this engine must be modified!

"Well, I personally prefer this improvement, it is very valuable, but it still needs to be carefully demonstrated before it can be finalized." The biggest boss on the Air Force side said with a smile.

Gao Zhendong smiled: "Well, now that we have a larger payload, we can make the third improvement. In fact, the original payload of the Il-28 can also be changed directly, but the larger payload will have a better effect."

Everyone is curious about what improvements require a larger payload.

Gao Zhendong drew a schematic diagram of the aircraft on the blackboard, and then added a few strokes to the cockpit, engine and other locations.

"Install Type 592 armored steel plates on the engine and crew compartment! Protect the engine and crew tightly! As a close air support fighter, it is inevitable to be hit in combat, so we will maximize the survival rate of the pilots."

All the comrades were happy. Hey, this is a good suggestion. Since there is enough load capacity, just add some armor to protect the heart of the aircraft - the engine and the brain - the pilot. As long as the aircraft still has power, the pilot's life can be guaranteed to the greatest extent in the end.

"Okay, this is a good suggestion, let's do it!" With the confidence brought by the high-thrust engine, the leaders of the Air Force did not even talk about "argumentation" this time, and directly made the decision. This thing was done!
"What about the fuel tank? If we really modify it according to your suggestion, it will be a flying oil drum." A comrade asked. Everyone looked at Gao Zhendong. This problem does exist. According to Gao Zhendong's suggestion of "replacing the missile with oil", it is preliminarily estimated that the fuel can be increased by 2.5 tons, and the range can be increased by 50% to 70%, but the danger will also increase.

Some fuel tanks are armored to protect against bullets, but for aircraft modified in this way, it is a bit expensive to make the tanks bulletproof - there are too many of them, and the wings cannot be equipped with that thing.

Gao Zhendong said: "If you have one, use a self-sealing fuel tank! If not, then find a way to make one."

This thing is actually not difficult. The Citigroup had a patent in 1921. The domestic standard was not released until 1997, but it does not mean that it did not exist before that. It is just that it is hard to say whether it existed in 1961.

It doesn't matter if there is none. The structure and principle of that thing are actually quite simple. Gao Zhendong can memorize them. At worst, he can ask the comrades in the Department of Applied Chemistry for help and get some suitable materials.

Even if it is a material problem and a hard-filled fuel tank cannot be made, it is still possible to simply make a self-sealing sandwich.

However, the reactions of his comrades soon made Gao Zhendong realize that he was still too optimistic.

What is a self-sealing fuel tank? This is a reaction.

I know about self-sealing fuel tanks, but I don’t know how to make them. This is the second reaction.

The root of the problem lies with the Russians. The self-sealing fuel tanks of the Russians at that time were also quite something, so they used nitrogen or carbon dioxide to prevent fire in the early days!
The Il-28 has its fuel tanks pre-filled with carbon dioxide.

Since the Citigroups and Hanscats started using self-sealing fuel tanks in S2, our comrades knew about it, especially those in the Air Force, but they didn't know how to make it.

"Comrade Zhendong, do you know how to make this thing?"

Seeing the comrades from the Air Force looking at him with a look of "surprise", Gao Zhendong could only laugh vaguely: "Well, when the factory was processing workpieces, we accidentally discovered some phenomena. I have some ideas, but they may not work."

It’s good to have ideas, I’m just worried that you don’t have any!
The comrades in the Air Force were very happy, as they knew the benefits of this thing.

Especially at this time, when machine gun combat and anti-aircraft gun fragmentation were still the main focus, the self-sealing fuel tank that could play a better role in bullets, shells and shrapnel was still very effective.

However, when encountering a continuous rod or discrete rod warhead, the effect is much worse. In that case, a foam-filled fuel tank is better.

But we have no way to build this thing. Now when we heard Gao Zhendong said he had an idea, the Air Force immediately made a decision: "We will ask our comrades who are working on aircraft to consult you about this matter, haha."

Their laughter was like that of a child walking on the street and accidentally picking up a "big black ten".

After this little episode, Gao Zhendong continued to report his ideas on converting the bomber into an attack aircraft.

"In terms of aircraft structure, I suggest removing the tail turret and the pilot cabin, reducing the crew from three to two, with a tandem two-seat layout, with the pilot in the front seat and the weapon operator in the back seat, taking into account communications."

This change shocked the leader of the Defense Work Committee who had been smiling the whole time: "Zhendong, you don't even want your butt anymore, so you're throwing away your eyes too?"

"For the eyes, I'm considering leaving the navigator's cabin empty and installing radar and anti-tank machine guns. It's a waste to put a navigator and bombing sights in such a large nose space. The space there is very precious. If you want to use it for anti-ship, this S2-era bombing method is extremely inefficient and basically has no possibility of breaking through the enemy's defense. You still have to install radar and guided weapons."

The Citigroup's navy is invincible. Their main air-to-ship weapon is iron bombs dropped from planes, but we can't learn this. Besides, they are not without worries. When Gao Zhendong traveled through time, the Citigroup was deeply troubled by the lack of truly useful air-to-ship weapons, and their ship-to-ship weapons were also weak. When facing our dumplings, they suddenly found that they had no way of anti-shipping.

As for the anti-tank machine gun, Gao Zhendong learned it from the A-10. However, he certainly could not learn the A-10's method of building a plane on top of the gun.

"What about the pilot?"

Our truly reliable theater navigation was the TACAN tactical air navigation system that we got from the French in the 80s, and then developed ourselves. Before that, the tactical navigation was just usable, but not very useful.

"The Il-28's navigation system includes a radio compass, a radio altimeter, and a beacon receiver. None of these devices must be used in the transparent pilot cabin."

(End of this chapter)