After a field trip, Philip finally chose Lorwyn Island. The terrain here is relatively flat, and the amount of earth and stone that needs to be leveled during the construction of the factory is much smaller, and the area of this island is relatively large, and there will be land for the expansion of the aircraft factory in the future.

Anderson was very attentive to this, and all the formalities were completed quickly. The same is true for Messerschmidt's side, the first funds arrived quickly, and the Dragon Soul Aircraft Industry Company broke ground!

The factory covers an area of 800 acres, and will become a 1,600 meters long, 50 meters wide simple runway, hangar area of 40,000 square meters, 2 aircraft assembly workshops, each area of 12,000 square meters, 8 other types of workshops, office buildings, technology research and development buildings and apartments and other supporting facilities.

In order to produce products as soon as possible, Philip adopted the mode of R&D and production while building, because the first products to be developed by the company are multi-blade torque converter propellers and aero engine exhaust gas turbochargers, so there is no need to wait for the factory to be fully completed. After recruiting a group of technicians using the temporary house, the research and development work began.

Even Anna moved to the construction site and worked on the factory with Philip and Lucas.

Messerschmidt also sent several capable technicians from the German company BMW to Sweden to help Philip develop multi-blade torque converter propellers and aero-engine exhaust gas turbochargers. Among these people, some are good at machining, some are proficient in aviation materials, and some are good at engine manufacturing.

David is a technologist at the BMW plant and is responsible for the process management of engine component production. This time he was sent to Sweden by the company, and he was extremely reluctant. Originally, I had worked in BMW for more than ten years, but now I have to leave my hometown and build a new factory in such a place where birds don't, and it is to develop multi-blade torque converter propellers and aero engine exhaust gas turbochargers, these two things are not so easy to make, David also knows that there are several companies doing it, but he has not heard of any company succeeding.

Maximilien is a material engineer at the BMW factory, with a deep knowledge of metal materials, and like David, he complained all the way to Lorwyn Island, although he was reluctant, but he couldn't help it, you must know that in this era, if you don't obey, you can only leave BMW, he doesn't want to lose such a good job, after all, the salary in BMW is much higher than other companies.

Felix and Paul were different, both of them were young people who had just worked and were worried that they would not have a chance to prove themselves, and when they heard that the company was going to send someone to Sweden, the two young men immediately approached the chief engineer Messerschmitt and asked to go to Sweden to start a new business. Since they did well at BMW and were very good at the technical aspect, they were very suitable for the assignment to a new company.

Multi-blade torque converter propellers and aero engine exhaust gas turbochargers are two things, which can of course be very easy to manufacture in the future. However, in the early thirties of the 20th century, there were many technical difficulties that needed to be solved.

The exhaust gas turbocharger mainly consists of a pump wheel and a turbine, and of course some other control elements. The pump wheel and the turbine are connected by a shaft, that is, the rotor, and the exhaust gas discharged from the engine drives the pump wheel, which drives the turbine to rotate, and the turbine rotates to pressurize the air intake system. The supercharger is installed on the exhaust side of the engine, so the working temperature of the supercharger is very high, and the speed of the rotor is very high when the supercharger is working, which can reach more than 100,000 revolutions per minute, such a high speed and temperature make the common mechanical needle roller or ball bearing can not work for the rotor, so the turbocharger generally adopts full floating bearing, lubricated by oil, and coolant cools the supercharger.

The aviation piston engine is different from the diesel engine, it does not enter the cylinder, but the mixture of gasoline and air, and the pressure is too high and it is easy to deflagrate. Therefore, the installation of a turbocharger must avoid deflagration, and there are two related issues involved, one is the control of high temperatures and the other is the control of ignition time.

Due to the wide speed range of the piston engine and the large change in air flow, the compression impeller shape of the turbocharger is a complex ternary curved ultra-thin-walled impeller, generally with 12 to 30 blades, arranged in a radial curve, the thickness of the blades is less than 0.5 mm, and it is made of aluminum. The shape of the blades has a direct impact on the performance of a turbocharged engine. The more reasonable the shape and angle of the impeller, the lighter the mass, the more sensitive the impeller starts, and the smaller the inherent defect of the turbocharger, the "reaction lag". It is quite difficult to use the equipment and technology of this era to manufacture such an ultra-thin wall impeller with a complex curved surface.

However, the choice to develop an exhaust gas turbocharger is also considered, in this era, if a simple comparison between machinery and exhaust gas turbocharger, it can be seen that mechanical turbocharging has obvious shortcomings, such as the need for engine output to drive the supercharger, when flying at high altitudes, the supercharger can eat up the output of hundreds of horsepower. The heavy weight of the supercharger and the lack of flexibility in the mounting position make it difficult for the engine to be equipped with the new supercharger. In terms of overall efficiency, supercharging is less efficient than turbocharging. Therefore, once the exhaust gas turbocharger is successfully developed, it can basically monopolize the market and become the most profitable thing, you must know that it can make the aero engine fuel saving up to about 5%, and the aircraft installed with the exhaust gas turbocharger has a small power loss of its high-altitude engine, so the ceiling is higher, which is a very good choice for combat aircraft such as fighters and bombers.

However, exhaust gas turbochargers require special heat-resistant alloys, which need to be supported by metallurgical technology, and fortunately, Bofors is a leader in this area, plus Philip has the technology to surpass this era, because he has the advantage of developing turbochargers more than other companies.

The function of the variable pitch propeller is to make the different sections of the propeller have a moderate angle of attack in the entire flight envelope range, so as to make it have high work efficiency. It uses mechanical control devices, which can control the angle of attack of the propeller, which is very important for improving the working efficiency of the engine propeller, using this technology, the propeller can be made from the take-off speed of the aircraft to the maximum flight speed have a high work efficiency, moderate to keep the engine has a large output power. Moreover, Philip developed a multi-bladed propeller, which was more aerodynamically efficient.

All propellers consist of a set of variable pitch blades. Each blade is rotatably mounted on a rotating bracket and is equipped with a gear that is meshed with the actuator gear ring, and the actuator gear ring rotates on the rotating bracket and is connected with the control gear ring through a turnover mechanism. By converting the straight-line distance of the torque converter rod into the angle change of the propeller, the purpose of torque conversion is realized, it needs to be controlled by adjusting the hydraulic system, increasing the blade angle, and the resistance torque of the propeller becomes larger, when the resistance torque is greater than the rotating torque, the engine speed decreases, and the engine speed increases. The difficulty lies in its design to ensure that within the entire torque conversion range of the propeller, the propeller hub and the control components and other related parts do not interfere with the movement, and there must be a protective device in case of operation failure.

Philip finally decided to adopt the design of the crank linkage, which allowed the area of the cylinder and piston to be reduced and the torque conversion torque could be obtained with less torque.