But trouble is trouble, but what needs to be done still has to be done, and there is an advantage to it.

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

To be honest, Liu Hai is also the first time to design this kind of aircraft, and in this era of civil airliners, the various systems are relatively simple.

With the development of science and technology, civil aviation passenger aircraft pay more and more attention to comfort, and the higher the comfort, the more troublesome and more means are needed to achieve.

In later generations, a simple chair, what kind of ergonomics or the like, is not needed at all now.

Fortunately, Liu Hai has a supercomputer in the space of an aircraft carrier, otherwise it would have taken Liu Hai 5 to 10 years to design this small airliner alone.

The structure of the body, the combination of various systems inside the body, such as the lighting circuit, the temperature system, how the pipes inside the body are arranged, and the front design and the back design may conflict, and it is very easy to change it on the computer.

However, it is also fortunate that Liu Hai met Sun Aiguo, a factory director, in Sun Aiguo's opinion, as long as the engine of this twin-engine transport aircraft is solved, the rest is easy to say.

I don't understand the complexity at all, of course, with the current status of Liu Hai, wherever he says he wants to do something, others will support him unconditionally.

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

Not every big man can meet a good leader like Sun Aiguo.

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

Moreover, the cost performance of this aircraft is also very high, the piston engine aircraft is not only simple to use and maintain, but also the cost of use is extremely low.

Of course, this cost is for other aircraft, cargo aircraft bangs add a drop fuel tank design inside, that is, add a detachable combined fuel tank inside the cargo hold, so as to increase the range.

The reason why it is a combined fuel tank is mainly for the consideration of counterweight, there is no way to put the fuel tank in one place inside the aircraft, so that the weight of a single place increases, which will affect the difficulty of operation and flight attitude of the aircraft.

The internal design of the aircraft tanker is not the same as that of the tanker truck on the ground, and the internal design structure is more complicated.

The maximum range can be increased from 2,000 km to nearly 4,000 km.

It is less than 2,000 kilometers from Sanya to the southernmost part of the South China Sea, and this plane can run a round trip.

The airplane's fuselage has also been strengthened to accommodate the vibrations of cannon fire.

Of course, when the machine gun is firing, the plane 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 a kind of pressure to the people on the ground, and when this kind of aircraft hovers in the air and keeps shooting, how much pressure will it bring to the people on the ground.

I don't want to have much real results, but it's enough from the perspective of interference.

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

Liu Hai began to direct the workers to build the fuselage, the fuselage structure of this kind of aircraft is relatively simple, that is, the internal metal structure, the laying of metal keels, and then the keels are connected with metal.

This kind of low-speed aircraft does not require a high-strength girder structure like a jet aircraft, etc.

Because of its low speed, the force it bears is not very large.

The aircraft manufacturing workshop is also the workshop for manufacturing small aircraft, most of the production capacity of small aircraft manufacturing is on the Caofeidian side, and the motorcycle factory only retains the manufacturing capacity, and the manufacturing quantity is not as large as that side.

Because it is impossible to dismantle this workshop, Sun Aiguo is also preparing to build a large plane in the future.

Isn't this coming, Sun Aiguo's side is already preparing to completely cancel the manufacture of small planes and turn back to the manufacture of such double-engine transport planes.

The aircraft is hydraulically controlled and equipped with dual hydraulic systems from a safety point of view.

Cargo planes are good at this, the pipelines of each system are exposed inside, and maintenance is convenient.

The interior of the 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 later maintenance.

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

The rivet structure is used, and the rivet structure is easy to maintain, and if there is a problem, it can be removed and reassembled.

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

That process requires a high degree of precision and is complex.

Bangs don't need that kind of structure.

Under the command of Liu Hai, the keel of the aircraft was formed little by little, one day at a time, and after the keel was laid, the skin on the upper part of the fuselage was done.

The skin of the lower part of the fuselage will be done after the installation of the various internal systems is completed.

Hydraulic flight control system, lighting system, fuel supply system and much more.

Sun Aiguo looked at the planes that were constantly taking shape, and he had to go to the aircraft workshop every day to see them, one day at a time.

Seeing that the more than 20-meter-long plane was so huge in the workshop, Sun Aiguo felt that life was getting better and better.

Bangs runs everywhere in the workshop every day, aircraft manufacturing workshop, aircraft engine manufacturing on the maintenance department, yacht workshop, supercar workshop.

Take the drawings and give the technician a detailed explanation of what to do.

Sun Aiguo looked at the assembled aircraft engine, and he was also a little nervous, after all, the aircraft fuselage over there seemed to have been completed a lot, and various internal systems were being made.

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 bangs, looked at the big guy in front of him, and under the operation of bangs, the ignition started smoothly.

Bangs is also relieved, although there is no problem with his theoretical design, but it is not necessarily no problem to actually manufacture it.

Not to mention the newly assembled engine, it is sometimes repaired and disassembled and reinstalled may not be able to start smoothly, there are many reasons for this, sometimes it is just a small negligence.

Fortunately, a group of people in the maintenance department often make engines, and they have made more than one, and it is completely no problem to assemble them.

After the ignition test was successful, it was followed by continuous testing.

"I'll leave it to you next." After the successful test run, the later test bangs will not have the energy to pay attention.

The internal systems of the aircraft itself are also very critical, the cargo aircraft is only the basic version, and the passenger aircraft needs to install more systems on the basis of the cargo aircraft.

So these system bangs inside the cargo plane have to be stared at.

The internal hydraulic control of each pipeline is installed, debugged, and the maintenance port should be reserved.

Although these hydraulic pipeline circuits are exposed to the inside of the cargo plane, the circuit is invisible, because there is a pipeline, the line is through the pipeline, the pipeline is to protect the line inside, in the shipment of goods to avoid bumps.

Therefore, the access port is still outside, such as the safety of some lines and the access port of the hydraulic pipeline.

The reservation of the maintenance port is also particular, and this will also be used in passenger aircraft in the future.

There is also the internal oil supply system and so on, the bangs have to be all stared at that side, and there is no energy to watch the test run here.

After the hydraulic system inside the aircraft is arranged, a pressure test is carried out.

Many people have a misunderstanding in the pressure test, such as the tap water when decorating, some people think that the greater the pressure, the better, which is actually a mistake, the interface of the pipeline and the pipeline have a maximum value, once this value is exceeded, then the pipeline is likely to be caused by the pressure to cause dark damage.

That's why there's a standard test pressure, as long as it's under the standard test pressure, the test is fine.

However, the internal system of this aircraft in World War II is also relatively simple, which is actually convenient for the bangs, if it is said to be a complex system as a modern civil aircraft, maybe the bangs themselves will be designed 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 for several years to succeed.

During this period of time, Liu Hai commuted to and from work normally, including workers in the aircraft manufacturing workshop, because this kind of sample that had just been made did not require workers to work overtime, so that workers could rest well and have more energy to go to work the next day.

The assembly of aircraft during World War II did not have many demanding requirements, and modern aircraft did not work.

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

Because of the screws in some places, its entire screws form a stressed structure, once a screw is tightened, then the whole force will be reflected in this screw, which is easy to cause damage to the screw, or even collapse.

Therefore, several screws in this circle must be screwed a certain number of turns, so that several screws can bear the force.

Many modern aircraft are still assembled manually, because there were once airplanes that directly damaged the airframe structure due to the failure of power tools.

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

This is also the reason why modern aircraft manufacturing is relatively slow, and the assembly technology of each part is relatively high, and it is not like repairing a car with a cannon against the screw.

The technical requirements for the assembly of World War II aircraft are not very high, plus the workers of the motorcycle factory are accustomed to standardized operations and will not say that they come to their liking.

Screw as many as you want, and play as many rivets as you want.

Of course, these parts on the aircraft have to be screened again, and some defective parts, such as some rivets or something, will not be used.

Under the constant supervision and command of Liu Hai, the fuselage of the aircraft was gradually formed, the internal systems were gradually completed, and the pressure test of the energizing test was carried out.

The engines manufactured by the maintenance department were also manufactured one after another, and test runs were carried out.

All modern aircraft engines are tested for a certain period of time before they leave the factory.

The engine of the bangs is the same, the engine of each aircraft has to be tested in the workshop for a certain period of time, and it is a continuous and uninterrupted test run.

At the end of September '66, the aircraft workshop ushered in the most critical time, that is, the assembly of the engine, the most critical part of the aircraft.

Two engines were sent to the aircraft workshop, and today there are many leaders who come here.

The leaders of several departments, the leaders of the factory, all wearing helmets, stood within the green safety line.

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

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

This is actually for the safety of the workers in the factory, of course, the safety requirements of the aircraft workshop are very high, and this side is also a confidential workshop, so the workers abide by the rules and regulations, which is 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 said that it was an imitation of C46, but there were some changes.

Therefore, the various departments at the higher level have always thought that the motorcycle factory imitated the C46.

After arriving at the workshop, other department leaders are not very familiar with the C46 transport aircraft, but how can the department leaders in charge of aviation not be familiar?

"When Lao Sun reported, he said that there was a little change?" The leaders of other departments didn't think it was strange, because Sun Aiguo said that there were some changes when he reported.

Isn't it normal to change the same as the original?

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 head of the aviation department asked his secretary to hurry to find a photo of the C46 transport aircraft.

"Leader, we also planned to change it at the beginning, but we found that the original plane was relatively old, and there was no way to adapt to our current society, so we changed it to this way." Sun Aiguo smiled, and then said in a low voice.

Several other department leaders were surprised when they heard this, and then asked in a low voice: "You mean that this plane was designed by us?" ”

"It's not all self-designed, this engine is the Merlin engine of Rolls-Royce, Comrade Xiao Liu, after optimization, a single engine can reach more than 2,100 horsepower." Sun Aiguo's tone was very modest, but his mouth was about to crack open with laughter, and he obviously looked proud.

"2,100 hp!" Several other departments are not very clear about other data, but they are still sensitive to this dynamic data.

"In addition, the design parameters of this aircraft can reach 4.5 tons, and the maximum range can reach 4,000 kilometers with the addition of auxiliary fuel tanks."

"Comrade Xiao Liu has specially strengthened the structure of the airframe, and it is possible to install machine guns or other weapons inside the aircraft."

"Comrade Xiao Liu originally planned to copy the C46, but the wing of the C46 is in the middle, and there is no way to install the weapon system in the cabin, so it was changed to the current upper wing structure."

"The structure of the overall aircraft has changed again, so the fuselage has been changed again."

"Because of the change to the monoplane structure, the aircraft engine is a little inappropriate to use the star engine, so the engine was changed again."

"It's what it looks like now, so I have no problem reporting, I can only say that I encountered some troubles during the design, and to solve these troubles, I have to change the design." Sun Aiguo's words, of course, were said by Liu Hai.

The heads of various departments who heard this were also speechless, and this change became completely their own design.

However, for the ability to design a new aircraft, even if it is a relatively backward piston engine, the leaders still feel a little surprised.

"You mean that with the addition of fuel tanks, the range can reach 4000 km?" The leader of the aviation side is the most sensitive to this voyage, and when he heard this, he asked in astonishment.

To know what it means to have a range of 4000 km?

It means that after a single refueling, you can basically fly from the south to the north of our country.

And in the memory of this leader, the C46 transport aircraft seems to have a range of only more than 1,900 kilometers.

"Comrade Xiao Liu has set up a combined fuel tank inside the cabin, which can reach 4,000 kilometers if it is fully used, but Comrade Xiao Liu said that such a carrying capacity is relatively low." What Sun Aiguo is talking about here is, of course, the 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?

"Are you saying that this plane can also be equipped with machine guns?" The leaders of the aviation department seized on another word.

Sun Aiguo gestured to the fuselage: "Yes, it was because of the problem of the weapon shooting boundary that Comrade Liu Hai changed it to an upper wing." ”

The leaders of the aviation department instantly felt pleasantly surprised, that is to say, this armed transport plane can completely patrol the South China Sea, you must know that now we go to patrol the South China Sea, only by boat, because the distance is too far, there is no suitable aircraft to patrol there.

Few aircraft are capable of reaching a range of 4000 km, that is, a radius of 2000 km.

At this time, the secretary came back and took out the photo, everyone looked at the guys, where is the shadow of C46? Except for the cockpit of the front plane, which is somewhat similar, the rest of the fuselage wings have been completely changed.

"We design and manufacture our own aircraft?" A group of leaders compared it and really felt the difference.

"This plane needs a new name, right?"

"It definitely can't be called C46."

"It's a pity that it's a piston engine, if only it were a turboprop engine."

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

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

Bangs are powered on to the nearest line to observe whether each instrument is normal.

Then the leaders of these departments climbed on the plane, the inside of the plane looks very simple, and the keel can be seen around, the cargo plane is like this, everyone knows under the introduction of the leaders of the aviation department, the inside of the cargo plane is like this.

"There's a lot of space inside."

"Is the cannon installed in this place?"

"No wonder you want to change the wings?" A group of leaders stood at the door of the cabin, and finally knew why they wanted to change the wings.

(End of chapter)