Traveling through the sword to engage in military industry.

In the 60s, good news came from the aviation industry.

After obtaining the airworthiness certificate from Dongda, CAC-120 (Airbus A300) obtained the airworthiness certificate from Continental, which means that the new large aircraft has officially entered the mass production stage!

The two production lines built by Dongda's Yandu Aviation Industry Company are running at full capacity to produce orders from the domestic and Asian service circles. At the same time, Airbus, a company cooperated by Dongda and Rolls-Royce, has also started full-load mass production on the Westminster production line. Large quantities of spare parts from Dongda's aviation industry chain have begun to land at the Fog City Port on long-distance freighters.

Thanks to the world-leading turbofan engine, the 3800-seat passenger aircraft from Dongda can now have a maximum range of 3500 kilometers and easily reach an effective range of kilometers, which is more than enough for intra-continental routes in Europe.

Even from Lisbon, the southernmost tip of the European continent, to Helsinki, the northernmost tip of the European continent, it is more than enough. Therefore, after the first batch of test flights, BAC quickly placed an order for 5 aircraft in five years, preparing to make a major update to the company's European route models. The original propeller and turbojet engine passenger aircraft began to be sold and leased to small local airlines in the colonies to run regional air transport.

Compared with the Boeing and Douglas aircraft of the same seat class, the Rogue Hawk can save up to 300% of fuel, which reduces operating costs and makes BAC have no choice at all. With such an excellent fuel-saving aircraft, and the Airbus A300 also follows the trend of business class and ordinary economy class in the European continent in terms of seat design, the new aviation ergonomic seats are more comfortable than the original passenger seats, and the new model is almost a generation ahead in avionics, and has begun to realize full computerization and instrument digital display avionics. After mass production in Europe, the Airbus A not only received a large order from BAC.

Air France and Lufthansa, two rival airlines on the other side of the Channel, originally held a rather calm wait-and-see attitude towards this passenger aircraft.

However, after the first two aircraft of BAC Airlines were put into operation, they received good market feedback and reputation. Passengers unanimously believed that the new aircraft had a clear improvement in comfort compared to the old aircraft. More than 2% of the surveyed passengers said that if they had a choice in the same time period, they would give priority to the new aircraft!

As a result, Air France and Lufthansa could no longer sit still, and they hurriedly came to order 50 Airbus A300s each. They will put these new aircraft into use on the current European trunk routes to provide new-generation aircraft services for high-frequency air passengers.

In addition, smaller airlines such as Portugal, Spain and Italy also placed three to five orders. For a time, the orders from the European aviation market exceeded those from Tokyo and the Asian market!
This unexpected result made Chen Hanyuan dumbfounded. He had previously thought that in order to open up the European market, he would have to work hard for at least three to five years, waiting for the reputation of the Airbus A300 to ferment and the fuel-saving advantages to become prominent before a new round of orders would be formed.

But no one expected that after the first batch was put into operation, the reputation of Airbus A300 would immediately explode!
Of course, this is also related to Rolls-Royce/BAC Aviation. They are now deeply tied together and are in a hurry to promote this passenger aircraft, so they adopted some marketing methods after the first batch was put into use. In addition, the quality of the passenger aircraft was originally good, and Ren Zhong referred to the design and manufacturing level of the 70s. It is indeed superior to similar Boeing and Douglas -seat passenger aircraft.

This allowed the matter to quickly ferment and create market momentum.

After all, from the passengers' point of view, this is a passenger plane "produced by John Bull" itself, and they have a sense of trust in it. The same goes for European customers. John Bull has always been at the forefront in aviation, and now it has come up with a very sincere new passenger plane, which is naturally easy for them to accept.

If it is completely produced by the University of Tokyo, it is hard to say. At least in terms of the acceptance level in Europe, even the audience who have seen the first manned spacecraft will still have some doubts about high-tech products such as passenger aircraft.

Rolls-Royce, which has more than 200 orders, is now completely relieved. Simon Robert, president of Rolls-Royce, ordered the airworthiness certificate application team to work hard on the North American airworthiness certificate, and went to Downing Street many times to report the progress of this matter to the Prime Minister in person many times.

We are now leveraging the combined power of government and business to spare no effort in obtaining the North American Airworthiness Certificate.

Judging from the current market feedback, apart from other things, the Airbus A300 is also very competitive on North American domestic routes, especially in the 3500-kilometer market, where it is simply invincible. In view of BAC Airlines' excellent market feedback on the first batch of flight demonstrations, several major North American airlines have sent people to Rolls-Royce to learn more about this model.

In particular, to verify the details of fuel consumption, they even had specialists take a BAC flight to experience and check the actual flight fuel consumption. From what they saw and heard on the front line, the feedback was almost all positive!
The only question they asked was: “When will the custom-made aircraft with a range of 4500 kilometers be launched?”

Because the routes between cities such as Seattle to Miami and from Los Angeles to Portland are more than 4000 kilometers, basically domestic routes between major cities in North America are within 4500 kilometers.

However, there are quite a lot of city combinations with direct flights of more than 4000 kilometers between the two places, so the North American market is very sensitive to this flight distance.

After all, who would be willing to buy a large passenger plane with hundreds of seats, only to find out in the end that there are still many city routes that cannot be flown directly? For airlines, this is a huge challenge for the route design of passenger planes.

Passenger aircraft can only have greater market competitiveness if they can adapt to the demands of more routes.

Frankly speaking, the next generation of extended-range 120-seat passenger aircraft is already under study. The simplest change is to reduce the number of seats from CAC-300 (112 in Airbus A100) to 4000, reduce the weight of the cargo section, and increase the fuel tank load to load 4500 kg of aviation kerosene, so that the passenger aircraft's range can exceed kilometers.

Simply reducing the passenger and cargo load and increasing the fuel tanks would be the smallest change, but it would greatly damage the airline's profits.

This is because it means losing more than 10% of the profit for a longer flight, which has a huge impact on the economic recovery value of each seat on the aircraft, so this approach is not feasible.

After the plan was submitted, it was rejected before it even reached Ren Zhong.

This plan is simply cutting the feet to fit the shoes.

The proper solution is to adjust the design of the wing, enlarge part of the wing and add a folding winglet to increase the overall load capacity of the passenger aircraft without affecting the existing cargo and take-off standards.

This way, the aircraft can have the best of both worlds: if the fuel tank is filled with more fuel, it can fly farther; if it is for a shorter route, it can fill with less fuel. Combined with the modification of the folding winglets, the new model will not increase fuel consumption much, so this new solution is the best choice.

The folding wings from the main world are scientifically called winglets. The wing surface forms a specific angle with the flight direction of the fuselage. The combined force of the vortices on the winglets on both sides of the aircraft can not only provide lift, but also increase flight thrust.

In the main world, the successful development of winglets is a major achievement in the field of aerodynamics, which is of great significance for reducing flight fuel consumption, improving flight economy and environmental protection. For such an achievement, Ren Zhong must adopt the principle of taking what is available and directly arrange it. Of course, the patent right will permanently belong to the aviation industry of Dongda.

Since this technology has support from the main world, verification is very fast. The full-size wind tunnel model of the first-generation model aircraft was quickly taken out to start aerodynamic verification.

At the same time, the development of the CAC-150 (Airbus A310) also started prototype design work. Basically, the wings of the CAC-120 extended-range model were enlarged, and the fuselage was lengthened to add 6 rows of seats.

Originally, this would require a significant increase in the total volume. Before the WS-9 turbofan engine was updated, the unchanged power would result in a decrease in the thrust-to-weight ratio. Although this would not affect the takeoff and landing of the passenger aircraft, it would affect the maximum economic cruising speed of the aircraft.

However, considering that carbon fiber will soon be mass-produced in the future, if carbon fiber is used as a substitute, the carbon fiber composite material seats alone will be more than 35% lighter than ordinary aluminum seats.

In addition to the seats, a large amount of aviation aluminum alloys used on the wings can also be replaced on a large scale with carbon fiber. If carbon fiber composite materials are used on a large scale on this newly designed CAC-150, preliminary estimates show that the weight can be reduced by about 4000 kilograms on the existing basis of aluminum alloy materials. In this way, the increased weight of the elongated fuselage and enlarged wings can be almost offset.

In other words, the CAC-150, which has a much larger body, has a net weight that is not much different from that of the CAC-120 after using carbon fiber composite materials.

In this way, while using turbofan engines with the same thrust, the CAC-150 has increased its carrying capacity by 25%, but other aspects have remained almost unchanged. The change in direction further improves the aircraft's fuel efficiency and the economic benefits per seat.

If this type of passenger aircraft comes out, its advantage over medium- and long-haul regional aircraft with 150 seats will be almost overwhelming!
However, although the carbon fiber material has completed the research and laboratory output process design of T700, the large-scale production on the production line is still in the trial production process. The research on T800 has made certain progress. According to the imitation research of the main world team, preliminary laboratory output results have been achieved, but the production process design part is still in the research process, which will lag behind the mass production of T700 by at least 2 years.

However, the direction of future applications has now been determined, and in the initial stage it will mainly be used in the aviation field.

Low-level T300 carbon fiber composite materials are used to make aviation seats, completely replacing ordinary aluminum alloy seats. High-end T700 and T800 carbon fiber composite materials will be used commercially on a large scale in fuselages and wings, replacing a large amount of aviation aluminum alloys to reduce aircraft weight.

It will not only be used in passenger aircraft, but also in fighter jets and bombers. A fighter jet weighing more than ten tons can carry 2 to 3 more heavy bombs or missiles, or carry more fuel to increase its combat radius. For bombers of the C54 level, the increased internal fuel caused by weight reduction can increase the range by thousands of kilometers. If a comprehensive facelift is carried out, it will be enough to give this old fighter a new lease of life and enter the field of strategic bombers with a range of 8000 to 10000 kilometers.

It can be said that the problems in the aviation field raised by Northern Airlines suddenly triggered Ren Zhong's new development plan for the aviation field.

On the one hand, the development and introduction of new materials, especially the introduction of carbon fiber composite materials, are crucial to the future development of the aviation industry in terms of lightweighting. After occupying the technological commanding heights in this regard, it will be very beneficial to the subsequent dominant position in aviation.

On the other hand, it triggered the research on long-range passenger aircraft. Only market demand has a significant impact on the entire industry. Although the aviation industry has always been in endless pursuit of range, only clear demand can be transformed into a real source of power for technological progress.

The 4500-kilometer range is no problem for a four-engine passenger plane, which can be reduced to the 4-kilometer level. However, considering the fuel consumption of a four-engine passenger plane, such operating costs are a huge burden on airlines.

在主世界和亮剑世界现阶段时空，主流的做法是研究3发动力驱动客机，包括Hawker三叉戟、DC-10、MD-11以及波音727、Lockheed L101等都曾经风靡一时。

For Ren Zhong, this is a transitional design. The future world will prove that this design will easily become obsolete and has no future for development.

Therefore, in terms of technical route, Ren Zhong insisted on adopting a twin-engine design for medium and long-range passenger aircraft. He would rather find ways to design the aircraft, reduce the weight of the fuselage, or increase the thrust of the aircraft engine, rather than choose a non-mainstream design such as a three-engine design.

As for the real long-range large intercontinental passenger aircraft, Ren Zhong is optimistic about the four-engine large passenger aircraft.

The most eye-catching one is the Boeing 747 large commercial wide-body passenger/cargo transport aircraft!

As the ruler of intercontinental airliners, Ren Zhong had already made arrangements for cross-world technical research, and a team began to study all kinds of information about the 747 airliner he had brought over from the main world.

So for other four-engine passenger aircraft, in addition to iterating the propeller-powered C-54 successor series, Ren Zhong has also adopted a new turboprop engine based on the advanced PW127J turboprop engine to replace the original propeller engine. This has increased the flight speed of the Y-54, which was developed based on the original C-8, to 650 kilometers per hour, and the range has been increased by %, which has significantly improved the first improved version of Dongda's strategic bomber.

After subsequent weight reduction modifications, the new strategic bomber model will be further improved.

The introduction of turboprop engines has brought a new evolutionary and iterative direction to the original pure propeller engine transport aircraft.

For the Y-47, a successor development model based on the C-6, Ren Zhong's expectation is naturally that it will be a carrier of radar early warning aircraft and electronic warfare fighters. After adopting the WJ-127 engine developed from the PW11J, the power has been more than doubled, which has greatly improved the tactical indicators of the Y-6B. The maximum flight speed has been increased to 675 kilometers per hour. The current Y-6B has many shadows of the C-47 in terms of appearance, but it has nothing in terms of power and avionics.

The increase in power also brought about a surge in payload and flight speed, and the range was doubled after the fuel tank was enlarged, making the Y-6B reborn and a very reliable front-line tactical transport aircraft for the University of Science and Technology of China.

The subsequent development of turboprop is another feasible technical route for Ren Zhong to develop transport aircraft. After all, turboprop is a very mature, low-cost and high-efficiency aviation power. (End of this chapter)