Courtyard light

Chapter 354 What do you call reform? (First update)
But trouble is trouble, but what needs to be done is still done, and there is an advantage to this.

This time the aircraft is not big, and the various systems are not very troublesome. This lays the foundation for the design of future large passenger aircraft.

To be honest, this is Liu Hai's first time designing this kind of aircraft, and the various systems of civil aviation aircraft in this era are relatively simple.

With the development of science and technology, civil aviation passenger aircraft are paying more and more attention to comfort. The higher the comfort, the more trouble and more means are required to achieve it.

A simple seat in later generations would be all about ergonomics and the like, but now there is no need for it at all.

Fortunately, Liu Hai has a supercomputer in the aircraft carrier space. Otherwise, it might take Liu Hai 5 to 10 years to design this small passenger aircraft.

The structure of the body, the combination of various systems inside the body, such as lighting circuits, temperature systems, how the pipelines inside the body are laid out, the front design and the back design may conflict, but it is very easy to change it on the computer.

Fortunately, Liu Hai met a factory director like Sun Aiguo. In Sun Aiguo's view, as long as the engine of this twin-engine transport aircraft was solved, the rest would be easy.

I don’t understand the complexity at all. Of course, with Liu Hai’s current status, wherever he says he wants to build something, others will support him unconditionally.

Of course, some of them are unconditional support on the surface, but not necessarily on the cover.

Not every great person can meet a good leader like Sun Aiguo.

Liu Hai first designed a cargo aircraft. This cargo aircraft has a load capacity of nearly five tons and is also a cargo aircraft that can adapt to all environments in our country.

Moreover, the cost-effectiveness of this aircraft is also very high. The use and maintenance of piston engine aircraft are not only simple, but also the cost of use is extremely low.

Of course, this usage cost is for other aircraft. The cargo aircraft Liu Hai has added an auxiliary fuel tank design inside, that is, a detachable combined fuel tank is added inside the cargo compartment to increase the range.

The reason why it is a combined fuel tank is mainly for counterweight considerations. There is no way to put the fuel tank in one place inside the aircraft. This increase in weight in a single place will affect the difficulty of operating the aircraft and its flight attitude.

The internal design of an aircraft tanker is not the same as that of a tanker truck on the ground. The internal design structure is more complex.

The maximum range can be increased from the original 2000 kilometers to nearly 4000 kilometers.

The distance from Sanya to the southernmost part of the South China Sea is less than 2000 kilometers. This plane can make a round trip.

The aircraft's body has also been strengthened to adapt to the vibrations caused by machine gun fire.

Of course, when the cannon is firing, the aircraft can only hover so that the weapon on one side is always aimed at the target.

In fact, this kind of armed aircraft mainly brings pressure to the people on the ground. When this kind of aircraft hovers in the sky and shoots continuously, it will bring a lot of pressure to the people on the ground.

It doesn't matter how big the real results are, but it's enough from the perspective of interference.

After the engine drawings were produced, Liu Hai came to the aircraft manufacturing workshop and the materials were ready.

Liu Hai began to instruct workers to build the aircraft body. The body structure of this kind of aircraft is relatively simple, which is the internal metal structure, the laid metal keels, and then the keels are connected with metal.

This kind of low-speed aircraft does not require high-strength girder structures like jet aircraft.

Because its speed is low, the force it can withstand is not very great.

The aircraft manufacturing workshop is also a workshop that manufactures small aircraft. Most of the production capacity of small aircraft manufacturing is in Caofeidian. The motorcycle factory only retains its manufacturing capacity, and the manufacturing quantity is not as large as that of the other side.

Because it was impossible to abolish this workshop, Sun Aiguo also planned to build large aircraft in the future.

Soon, Sun Aiguo is preparing to completely cancel the production of small aircraft and go back to manufacturing this kind of twin-engine transport aircraft.

The aircraft adopts hydraulic control, and from the perspective of safety, it is equipped with dual hydraulic systems.

This is the good thing about cargo aircraft. The pipelines of each system are exposed internally, making repair and maintenance easy.

The interior of passenger aircraft is decorated, so the pipelines of these systems are all hidden inside, which not only increases the difficulty of assembly, but also increases the difficulty of subsequent maintenance.

The aircraft skin is made of very thin aluminum-magnesium alloy, and many interior beams of the aircraft are also made of aluminum alloy with hollow structures.

It uses a rivet structure. The rivet structure is easy to maintain. If there is a problem, just dismantle it and reassemble it.

In fact, many stealth fighters of later generations also use rivet structures, but they are embedded rivet structures.

That manufacturing process requires relatively high precision and is very complex.

Of course bangs don’t need that kind of structure.

Under Liu Hai's command, the aircraft keel was formed bit by bit, one piece a day. After the keel was laid, the skin on the upper part of the fuselage was finished.

The skin on the lower part of the fuselage will be finished after the installation of various internal systems.

Hydraulic flight control system, lighting system, fuel supply system, etc.

Sun Aiguo looked at the aircraft that was constantly taking shape, and went to the aircraft workshop every day to see it, one thing every day.

Seeing how huge the 20-meter-long aircraft was in the workshop, Sun Aiguo felt that life was getting better and better.

Liu Hai travels around the workshops every day, including the aircraft manufacturing workshop, aircraft engine manufacturing in the maintenance department, yacht workshop, and supercar workshop.

Take the drawings and give the technician a detailed introduction on what to do.

Sun Aiguo looked at the assembled aircraft engine and felt a little nervous. After all, the aircraft fuselage over there seemed to have been completed a lot, and various internal systems were being worked on.

If there is a problem with the power here, it will be troublesome, and the foreseeable manufacturing progress will be delayed.

However, Sun Aiguo believed in Liu Hai. Looking at the big guy in front of him, under Liu Hai's operation, the ignition started smoothly.

Bangs also breathed a sigh of relief. Although there was no problem with his design in theory, it may not be no problem in actual manufacturing.

Not to mention the newly assembled engine, even if the repaired engine is disassembled and reinstalled, it may not start smoothly. There are many reasons for this, and sometimes it is just a small oversight.

Fortunately, a group of people in the maintenance department often make engines, and they have made more than one type, so there is no problem in assembling them.

After the ignition test is successful, there will be continuous testing.

"The rest of this is up to you." After the test run was successful, Liu Hai no longer had the energy to pay attention to the subsequent tests.

The various systems within the aircraft themselves are also very critical. Cargo aircraft are only the basic version, and passenger aircraft need to install more systems based on cargo aircraft.

Therefore, these system bangs inside the cargo aircraft must be watched.

During the installation and debugging of each pipeline for internal hydraulic control, inspection ports must be reserved.

Although these hydraulic pipeline circuits are exposed inside the cargo plane, the circuit cannot be seen because there is a pipeline, and the circuit passes through the pipeline. The pipeline is to protect the circuit inside and when loading cargo. Avoid bumping when doing so.

Therefore, the inspection openings are still outside, such as the insurance of some lines and the inspection openings of hydraulic pipelines.

The reservation of inspection openings is also very particular, and this will also be used on passenger aircraft in the future.

There is also the internal fuel supply system and so on. If the bangs are all focused on that side, there will be no energy to watch the test run.

After the layout of the hydraulic system inside the aircraft is completed, a pressure test must be performed.

Many people have misunderstandings about pressure testing. For example, when renovating tap water, some people think that the higher the pressure, the better. This is actually a mistake. The pipe interfaces and pipelines have a maximum value. Once this value is exceeded, Then the pipeline is likely to be damaged by pressure.

This is why there is a standard test pressure. As long as there is no problem with the test under the standard test pressure, it will be fine.

However, the internal systems of aircraft like World War II are relatively simple, which actually makes Liu Hai more convenient. If it were to be as complex as a modern civil aviation aircraft, Liu Hai might have designed it to collapse.

There are so many internal systems in modern civil aviation aircraft that it really takes a team of hundreds of people to design them for several years before they can be successful.During this period of time, Liu Hai went to and from get off work normally, including workers in the aircraft manufacturing workshop, because the prototypes that were just being manufactured did not require workers to work overtime, allowing workers to have a good rest and have more energy to go to work the next day.

The assembly of aircraft during World War II did not have very stringent requirements, but the same cannot be said for modern aircraft.

The assembly process is very complicated, and there are basically regulations on how many turns a screw should be tightened.

Because the screws in certain places form a stress-bearing structure. Once a screw is over-tightened, the entire force will be reflected on the screw, which can easily cause damage to the screw. Even collapse.

Therefore, the screws in this circle must be tightened for a certain number of turns to allow the screws to bear the force.

Many modern aircraft are still assembled manually. This is because there were aircraft in the past where the failure of power tools directly damaged the aircraft body structure.

Once the aircraft body structure is damaged, there is no way to repair it or add a gasket like a car.

This is also the reason why modern aircraft manufacturing is relatively slow. The assembly technology of each component is relatively high, unlike repairing a car with a wind cannon and banging the screws.

The technical requirements for assembly of World War II aircraft were not very high. In addition, workers in motorcycle factories were accustomed to standardized operations and would not follow their own preferences.

Tighten the screws as much as you need to tighten them, and drive the rivets as you need to.

Of course, these parts on the aircraft need to be screened again. Some defective parts, such as some rivets, will not be used.

Under Liu Hai's constant supervision and command, the aircraft's body gradually took shape, various internal systems were gradually completed, and power tests and pressure tests were conducted.

The engines manufactured by the Maintenance Department were also gradually manufactured and tested.

All modern aircraft engines undergo a certain period of operational testing before leaving the factory.

The same goes for the Liu Hai engine. Each aircraft engine must be tested in the workshop for a certain period of time, and the test is conducted continuously.

At the end of September 66, the aircraft workshop ushered in the most critical moment, which was to assemble the engine, the most critical part of the aircraft.

The two engines were sent to the aircraft workshop, and there were many leaders here today.

The leaders of several departments and the leaders in the factory all wore helmets and stood within the green safety line.

When the crane is operating, everyone must leave the red zone.

Non-staff members are not allowed to stand in the yellow area.

This is actually for the safety of workers in the factory. Of course, the aircraft workshop has very high safety requirements, and it is also a confidential workshop, so workers abide by the rules and regulations better than other workshops.

"This plane doesn't look like a C46?" The leader in charge of the aviation department looked at the plane in front of him and said in a low voice.

When Sun Aiguo went up to report, he was talking about imitation of C46, ​​but with some changes.

Therefore, various departments at higher levels always thought that the motorcycle factory was copying C46.

After arriving at the workshop, other department leaders were not very familiar with the C46 transport aircraft, but how could the department leader in charge of aviation not be familiar with it?
"Lao Sun said there were some minor changes when he reported?" Other department leaders didn't think it was strange, because Sun Aiguo said there were some minor changes when he reported.

Isn’t it normal that the changes are different from the original ones?
When the leader in charge of the aviation department heard this, he was speechless and said, "From the power system to the entire layout, it is completely different?"

The leader of the aviation department asked his secretary to quickly find a photo of the C46 transport aircraft.

"Leader, we planned to change it at first, but we found that the original aircraft was relatively old and could not adapt to our current society. We kept changing it and changed it to this." Sun Aiguo chuckled and said in a low voice.

Several other department leaders were surprised when they heard this, and then asked in a low voice: "You mean we designed this aircraft ourselves?"

"It's not all designed by myself. This engine is the Merlin engine of Rolls-Royce. Comrade Xiao Liu, after optimization, a single engine can reach more than 2100 horsepower." Sun Aiguo said in a very humble tone, but he had a mouth. He smiled widely and looked obviously proud.

"2100 horsepower!" Several other departments don't know much about other data, but they are still relatively sensitive to this power data.

"In addition, the design parameters of this aircraft can reach a load capacity of 4.5 tons, and with the addition of an auxiliary fuel tank, the maximum range can reach 4000 kilometers."

"Comrade Xiao Liu has specially strengthened the body structure so that machine guns or other weapons can be installed inside the aircraft."

"Comrade Xiao Liu originally planned to copy the C46, ​​but the C46's wings were in the middle and there was no way to install a weapon system in the cabin, so it was changed to the current high-wing structure."

"It was changed to a high-wing structure alone. The structure of the entire aircraft also changed, so the fuselage was modified again."

"Due to the modification of the upper monoplane structure, it was inappropriate to use a radial engine for the aircraft engine, so the engine was modified again."

"It has become what it is now, so there is no problem with my report. I can only say that I encountered some troubles during the design. To solve these troubles, the design must be changed." Sun Aiguo's words were of course said by Liu Hai. of.

The heads of various departments were speechless when they heard this. After many changes, it became completely their own design.

However, the leaders were still a little surprised to be able to design an aircraft from the ground up, even with a relatively backward piston engine.

"Are you saying that with more fuel tanks, a range of 4000 kilometers can be achieved?" The aviation leader was the most sensitive to this range. Hearing this, he asked in shock.

Want to know what a 4000-kilometer voyage means?
This means that after a single refueling, you can basically fly from the south to the north of my country.

Moreover, in this leader's memory, the C46 transport aircraft seems to have a range of only more than 1900 kilometers.

"Comrade Xiao Liu has set up a combined fuel tank inside the cabin. If all is used, it can reach 4000 kilometers. However, Comrade Xiao Liu said that such a carrying capacity is relatively low." Sun Aiguo is of course talking about design parameters.

The leaders also understood this and nodded when they heard this.

A map instantly appeared in the minds of the leaders of the aviation department, that is, 4000 kilometers. How far can it radiate?
"You mean this plane can also be equipped with machine guns?" The leader of the aviation department caught another word.

Sun Aiguo gestured towards the fuselage: "Yes, it was because of the problem of weapon shooting that Comrade Liu Hai changed it to a high-wing monoplane."

The leaders of the aviation department were immediately pleasantly surprised. In other words, this armed transport aircraft can completely patrol the South China Sea. You must know that now we can only go by boat to patrol the South China Sea, because the distance is too far and there is no suitable aircraft. The plane goes there to patrol.

Very few aircraft can achieve a range of 4000 kilometers, which is a radius of 2000 kilometers.

At this time, the secretary came back and took out the photo. Everyone looked at it, good guy, where is the shadow of c46 here?Except for the cockpit at the front, which is somewhat the same, the rest of the fuselage and wings have been completely changed.

"We designed and manufactured the aircraft independently?" A group of leaders compared the aircraft and finally felt the difference.

"Is this plane going to have a new name?"

"It definitely can't be called c46."

"It's a pity that it's a piston engine. It would be better if it was a turboprop engine."

"The fuselage structure of the turboprop engine is completely different."

Amid the discussion among the leaders, the aircraft engine was installed on the wing, and all connecting structures were installed.

Liu Hai powered on and tested nearby to see if each instrument was normal.

Then the leaders of these departments climbed onto the plane one after another. The interior of the plane looked very simple, and the keels could be seen around it. This is what a cargo plane looks like. After the introduction of the aviation department leaders, everyone learned that this is what the inside of a cargo plane looks like.

"The interior space is not small."

"Is the machine gun installed here?"

"No wonder the wings need to be changed?" A group of leaders stood at the door of the cabin, finally knowing why the wings were changed.

(End of this chapter)