Chapter 553: With great strength, bricks fly and armor is stacked!
“The second improvement suggestion about the Il-28 imitation aircraft is that during the imitation process, the LYP-5 turbojet engine will no longer be used, but directly improved and installed now for the Zhan-6 fighter jet The LYP-6 turbojet engine "
This suggestion actually comes from an improvement of the Z-5 seen in the previous life, using the LYP-6A engine to replace the LYP-5 with greater thrust. At the same time, the engine diameter has been reduced from 1.2 meters to less than 0.7 meters, and the weight has been reduced by nearly 300 kilograms.
However, that improvement was ultimately unsuccessful because the engine heat dissipation could not be solved.
But here, this problem is not big. The reason is that this LYP-6 is not the other LYP-6, and the materials are different.
Compared with the GH33 alloy originally used in LYP-5 and LYP-6, the 591 high-temperature alloy here can operate at 1100℃-1250℃ for a long time, while the latter can only have sufficient high-temperature strength at 700~750℃, which is relatively The oxidation resistance is better than the high temperature strength, 900℃.
Even the self-developed GH135 alloy later used in LYP-6A, its long-term operating temperature is not as good as 591, about 980°C. This GH135 is the main contributor to the significant increase in thrust of LYP-6, but it still cannot hold it.
However, compared with 591, the two are not completely different, at least they are comparable.
So this new LYP-6 is actually very suitable for the modification of the IL-28.
"Such a major surgery? Is it too radical?" Everyone had some questions.
Gao Zhendong wrote several models on the blackboard and explained them one by one.
“With the discontinuation of production of the Z-5 in 1959, the main installation target of the LYP-5 engine is no longer available, and technically speaking, compared with the LYP-6 of the same level, the LYP-5 is We are lagging behind, and there is no need for us to maintain the production of two engines with similar thrust levels."
The comrades in the Air Force thought about it, nodded, and felt that it made sense.
Gao Zhendong drew a line under LYP-6 on the blackboard: "And there is another key point. The thrust of the current LYP-6 far exceeds that of the LYP-5, and they are already two-level engines. Yes, the replacement of LYP-6 will allow the J-5 to have a larger load capacity and a longer range, and a larger production quantity will also effectively dilute the production cost of LYP-6."
said. After that, he wrote numbers under several models and compared them one by one.
The LYP-5 military thrust is 25.5 kN, and the afterburning thrust is 32.5 kN. Compared with the imitation object of the LYP-6, the afterburning thrust is slightly higher, 1 kN, but the weight, diameter, and thrust-to-weight ratio are all compared with it. Quite a bit different.
The weight is 40% heavier, the diameter is 90% larger, but the thrust-to-weight ratio is 3.4 to 4.5, which is almost 1/4 smaller.
Compared with the LYP-6 of this world, it lags even further behind. With the efforts of Mr. Wang of the Northeast Aviation Development Institute and others, the finalized LYP-6 of this world is almost the same, but The thrust is much higher than the 36.8 kilonewton afterburner thrust of LYP-6A that Gao Zhendong saw in his previous life!
It is estimated that taking into account lifespan and other parameters, it is not as exaggerated as the LYP-6B afterburner thrust of 43.7 kN for the Zhan-12 that Gao Zhendong saw in his previous life in 1970, but it still reached the military thrust of 31.5 kN. Niu, with an afterburner thrust of 40 kN, the thrust-to-weight ratio has increased from 4.5 to more than 5.5 in one fell swoop.
To put it exaggeratedly, this thing can even make the Z-6 go supersonic without using afterburner.
With great force, bricks fly, nothing more than that.
But this is the latest data obtained by Mr. Xiao from the Porcelain Aircraft Factory. This latest engine was just completed by the Northeast Aviation Development Institute and has not yet been used on the Zhan-6. Now the Zhan-6 The engine used is a little more conservative.
Comrades in the Air Force knew that the LYP-6 engine was much stronger than the imitation object, but they did not realize that it was so much stronger. Looking at the data comparison on the blackboard, my head suddenly felt hot. I want this. Want this!
“And this modification is actually not that difficult. When the engine connecting parts used for heavy loads are used for light loads, it is relatively easy to improve.”
This conclusion comes from the previous life. The Il-28 that was modified to LYP-6A, the engine modification of that aircraft was successful, but the problem was only in the engine itself.
All the comrades in the Air Force could do was shout "Okay". It has greater thrust, lighter weight, less drag, and is not difficult to modify. Even if this aircraft is still used as a bomber, the engine must be modified!
"Well, I personally prefer this improvement. It is very valuable, but it still needs careful demonstration before it can be decided." The biggest leader of the Air Force said with a smile.
Gao Zhendong smiled: "Well, now that we have a larger load capacity, we can make the third improvement. In fact, the original load capacity of the IL-28 can also be directly changed, but the load capacity is larger. The effect is better.”
Everyone is curious about what improvements require a larger load capacity.
Gao Zhendong drew a schematic diagram of the aircraft on the blackboard, and then drew a few strokes on the cockpit, engine and other locations.
"Install type 592 armor steel plates on the engine, crew compartment, etc.! Protect the engine and crew tightly! As a close air support fighter, it is inevitable to be hit in combat, so we will try our best to protect the engine and crew. Improve the pilot's survival rate."
All comrades are happy, eh, this is a good suggestion. Since the load capacity is rich, then put on some armor and put the heart of the aircraft-the engine and brain-the pilot. By protecting it, as long as the aircraft still has power, it can ultimately protect the pilot's life to the greatest extent.
"Okay, this is a good suggestion, let's do it!" With the confidence brought by the large thrust engine, this time the leaders of the Air Force did not even say "demonstration", and just made a decision on this matter. Done!
"What about the fuel tank? If it is modified according to your suggestion, this will be a big flying oil drum." A comrade asked. Everyone looked at Gao Zhendong. This problem does exist. According to Gao Zhendong's suggestion of "replacing bombs with oil", it is initially estimated that the oil can be loaded with 2.5 tons more and the range can be increased by 50% to 70%. However, it is dangerous. Also increased.
Some fuel tanks are armored and bulletproof, but for an aircraft modified in this way, it would be a bit expensive to make the fuel tanks bulletproof - there are too many, and the wings cannot be equipped with those things.
Gao Zhendong said: "If there is one, use a self-sealing fuel tank! If not, then find a way to get it."
This thing is actually not troublesome, Citigroup had it in 1921 It is patented. The domestic standard was only released in 1997, but before that, it does not mean that it did not exist. It is just that it is hard to say whether it existed in 1961.
It doesn’t matter if you don’t have it. The structure and principle of the thing are actually quite simple. Gao Zhendong can memorize it. At worst, he can go down and ask the comrades from the Chemical Department for help to get some suitable materials.
Even if the material is a problem and a hard-filled fuel tank cannot be made, it is still no problem to simply make a self-sealing interlayer.
However, the reaction 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 is still with Lao Maozi. At this time, Lao Maozi’s self-sealing fuel tanks were pretty mediocre, so they used nitrogen or carbon dioxide in the early stages to prevent fires!
The IL-28 is prefilled with carbon dioxide in the fuel tank.
Since Citigroup and Hanscat started using self-sealing fuel tanks in S2, our comrades do know about it, especially the comrades in the Air Force. As for how to make them, we don’t know.
"Comrade Zhendong, do you know how to make this thing?"
Looking at the comrades from the Air Force looking over with a look of "unexpected joy", Gao Zhendong could only hold his tongue. Hahahahahaha in confusion: "Well, when I was processing workpieces in the factory, I accidentally discovered some phenomena. I have some ideas, but they may not work."
It's good to have ideas, I'm afraid you don't have any!
The comrades in the Air Force were overjoyed. They still knew the benefits of this thing.
Especially at this time, in an era dominated by machine gun fighting and anti-aircraft artillery fragmentation, self-sealing fuel tanks that can play a better role in protecting bullets, shells and shrapnel are still very effective.
However, when it comes to continuous rods or discrete rod warheads, the effect is much worse. In that case, it is better to fill the fuel tank with foam.
But we have no way to build this thing. Now that we heard Gao Zhendong say he had an idea, the Air Force immediately made the decision: "We will ask the comrades who are responsible for the aircraft to come and ask you for advice on this matter, haha."< br>
Their laughter was like a child walking on the road and accidentally picking up a "Big Black Ten".
After this episode, Gao Zhendong continued to report his thoughts on converting bombers into attack aircraft.
"In terms of aircraft structure, I suggest canceling the tail turret and pilot cabin. The crew should be changed from 3 to 2. A two-seater layout in tandem, with the driver in the front seat and the weapons operator in the back seat, taking into account communications."
< br>This change shocked the leader of the National Defense Work Committee who had been laughing: "Zhendong, you don't even want to give up your butt, but also throw away your eyes?"
"I will consider the eyes. The best thing is to leave the navigator cabin vacant and install radar and anti-tank cannon. It is really a waste to put a navigator and bomb sight in such a large nose space. The space in that place is very precious. If you want to use it against ships, this S2-era bombing method is extremely ineffective, and there is basically no possibility of breaking through the enemy's defense. You have to use radar and guided weapons."
Ciudi is a navy. The world is invincible. The main air-to-ship weapon is to throw iron bombs from airplanes, but we can't learn this skill, and they are not without worries. When Gao Zhendong traveled through time, Citigroup was deeply troubled that there was no really useful air-to-ship weapon. The ship's weapons are also weak. Facing our dumplings, we suddenly found that we can't fight against the ship.
As for the anti-tank cannon, Gao Zhendong learned it from the A-10, but he definitely couldn't learn from the A-10's method of building an airplane on top of the gun.
"What about navigation?"
Our truly reliable theater navigation is the TACAN tactical air navigation system that we got from Gallic Chicken in the 1980s, and then developed it ourselves. Before that, Tactical navigation is above usability, but not easy to use.
“The Il-28’s navigation system includes a radio compass, radio altimeter and beacon receiver. None of these devices must be used in the transparent pilot cabin.”
(End of this chapter)