Messerschmitt decided to hold a seminar on the overall design of large transport aircraft at the Dragon Soul Aircraft Manufacturing Company, to discuss in detail the overall design of large transport aircraft, and then implement the project as soon as possible. Of course, this large transport aircraft will be produced by the Dragon Soul Aircraft Manufacturing Company, because at this time Germany was still limited by the Treaty of Versailles, and many military materials and materials were relatively scarce, especially those used for the manufacture of large transport aircraft.

In addition to Philip and Messerschmidt, the company's deputy general manager Lucas, assistant to the general manager Anna, chief designer Sidnikam, assistant to the chief designer Antonov, and Maximilien, Paul, David and Felix from the Messerschmidt company.

Ten people sat in a small conference room, with Messerschmitt speaking first.

Messerschmidt glanced at the participants present, and then said slowly: "Everyone, we are holding this discussion here today to conduct a detailed research and discussion on the transport aircraft project that the company will develop next. My idea is to develop and produce a medium and large transport aircraft in the Dragon Soul Aircraft Manufacturing Company, and Philip and I have discussed the design goals, and we believe that we should develop an 18-ton transport aircraft with a carrying capacity of about 4 tons, which can meet most of the cargo and passenger transportation needs of major airlines. Such transport aircraft will be divided into two series, one cargo and one passenger. ”

Speaking of this, Messerschmidt looked at Philip, and then said, "Philip, first of all, tell me what specific design ideas you have for this transport aircraft." Then we discussed whether it was feasible and how to carry out the design and prototype work. ”

Philip nodded and said loudly: "Regarding the overall design of the 18-ton transport aircraft, I have a few ideas, the first is that our transport aircraft must have innovative things in the design, and we can't always follow the trend, so in the overall design, I personally prefer to use the cantilever upper monoplane and the retractable front three-point landing gear, the fuselage adopts a semi-monocoque thin-walled structure, and the cabin length is more than 8 meters, the width is more than 2.5 meters, and the height is more than 1.8 meters. The powertrain is currently only powered by a 715 hp BMWVII engine, with two under each wing mounted in the form of wing cranes, using a new 6-blade large swept torque converter propeller and exhaust gas turbocharger. ”

As soon as Philip finished speaking, someone raised a different opinion, and the person who spoke was none other than Sidnikam, the company's chief designer.

Cam said with a serious expression: "I don't have much of an opinion overall, but I don't have a different opinion on the form of the landing gear and main wing. As we all know, Junkers' Ju52 transport aircraft and M20 transport aircraft all use rear three-point landing gear and lower wings, which are simple and easy for passengers to get on and off. The front three-point landing gear that Mr. Philip is talking about, I don't know if its main landing gear is mounted on the fuselage or on the wing? ”

Philip smiled and said, "Good question, Mr. Cam!" In fact, the key to this question is which design is more convenient for goods and people to get on and off. The advantage of the current rear three-point landing gear is that the personnel go up and down from the hatch on the side of the rear fuselage, which is very low and can go up and down without the need for a gangway. However, as far as the loading and unloading of goods is concerned, it is not very convenient, and the rear three-point landing gear is prone to accidents when braking, and the nose touchdown and tail cocking accidents are not uncommon. Especially for medium and large transport aircraft, this is a very disadvantage. The front three-point landing gear does not have this problem, and the nose wheels are under the nose away from the center of gravity of the aircraft, which can avoid the danger of the nose touching the ground and the tail cocking when the aircraft brakes. The two main wheels are symmetrically arranged at the rear of the center of gravity, and the left and right main wheels have a certain distance to ensure that the aircraft will not tip over when taxiing on the ground. In addition, combined with the cantilever upper wing layout, the engine is higher from the ground, and the propeller blades can be made longer, and the propulsion efficiency is higher. Coupled with the clamshell hatch at the tail, it is very convenient for cargo loading and unloading. ”

Messerschmidt applauded: "Good! I think the design is really innovative, and I would add that the benefits of the front three-point landing gear should be much better than the pilot's visibility. Philip, then said, what kind of structure is better for this kind of landing gear? ”

Philip looked at Cam and saw that he was contemplating with his head down, perhaps thinking about the pros and cons of the two landing gear arrangements.

Philip said with a smile: "This kind of front three-point landing gear has relatively high requirements for structural strength, especially the main landing gear, which is only suitable for installation under the wing behind the engine, so it can only use the shape of the strut struts, and use the strut as the retraction link of the landing gear, and the strut can also be made into a retractable action cylinder." ”

Cam then continued, "I see! Now that I finally figured it out, the front three-point landing gear that Mr. Philip was talking about was really a revolutionary design, and I think it would definitely replace the current three-point landing gear design. It's just that placing the main landing gear under the wing very high above the ground in this way requires the structural strength of the wing and landing gear struts to be very high, right? ”

Philip nodded, "That's right! Therefore, the wing design should be strengthened, and it is best to use a double-beam wing, so that the total torque of the wing to the root of the wing should be converted into a pair of concentrated forces suitable for the butt joint from the wing to the fuselage through the reinforcing ribs, and then transmitted to the fuselage through the joint. However, I envisioned a straight trapezoidal main wing, so the structural strength of the wing was relatively easy to achieve. The nose landing gear can be used semi-rocker type landing gear, the wheel is suspended under the load-bearing pillar and the shock absorber through a rocker arm, its shock absorber and the load-bearing pillar are integrated, the lower end of the pillar is hinged with the rocker arm, and the upper end is fixed with the fuselage or wing. ”

Cam gave a thumbs up and said, "Good design!" It seems that I am not in the wrong place, and I think that working under Mr. Philip will greatly improve my design skills, and your creativity is really amazing! In addition, what kind of design is the clamshell cargo door you are talking about? ”

Philip stood up and said slowly, "That's a good question!" This is why the front three-point landing gear and cantilever upper wing are used to make it easier to arrange this clamshell rear fuselage door. We can design the rear fuselage of the transport aircraft in an upturned shape, with two clamshell hatches at the bottom of the rear fuselage, and a middle wall that opens downward to serve as an upper cargo bridge. In this way, the cargo can be directly up and down from the tail of the fuselage, for example, the cargo can be pulled directly into the cargo hold with a small car, and the wide cargo hold can even be directly loaded with wheeled weapons and equipment such as assault vehicles and mountain artillery. ”