Messerschmitt listened carefully and did not miss a word, and when he heard the turbofan engine and the helicopter, he said with some confusion: "Philip, what is the new term for the turbofan engine and the helicopter?" Come and hear it!"

Xiao Weiguo also suddenly found that he had actually told the future of aero engines and aircraft. Fortunately, Messerschmidt was used to suddenly coming up with something new. So he smiled and said, "Dr. Wiley, the so-called turbofan engine is to add a large fan to the outside of the turbojet engine, and use the turbine to drive the fan in front of the engine to rotate to generate thrust. The airflow bifurcates into two strands. One stream flows directly to the rear of the engine without passing through the combustion chamber, and this part of the airflow is generated by the fan. The other part is generated by the instantaneous expansion and pressurization of the air in the combustion chamber, and the principle of this part of the air flow is the same as that of a turbojet engine. But unlike turbojet engines, turbofan engines derive most of their thrust from the airflow generated by the fans. Turbofan engines are more economical than turbojets, but their design and manufacture are more complex, and it is difficult to complete them with our current level of technology. ”

Seeing Messerschmidt's shocked expression, Xiao Weiguo continued: "Dr. Willy, let's not be in a hurry, we have to eat one bite at a time!" This is especially true of aero engines. Speaking of helicopters, helicopters are a kind of aircraft that can take off and land vertically, and can hover in the air, in fact, Leonardo da Vinci has long designed the basic structure of helicopters, but the technical difficulty of helicopters is also very large, and it has not appeared until now. Of course, the main thing is the engine, and with a high-powered turboshaft engine, all this will be easier. The helicopter is mainly composed of three major systems: fuselage, rotor, tail rotor, power and transmission, as well as airborne flight equipment. The rotor is generally driven by a turboshaft engine through a mechanical transmission system composed of a propeller shaft and a reducer, and can also be driven by the reaction force generated by the jet at the tip of the propeller. ”

Messerschmidt exclaimed: "This helicopter is a good thing!" Its advantages are too obvious, we must develop this kind of aircraft. I think it's going to be very useful! ”

Xiao Weiguo said with a smile: "The outstanding feature of the helicopter is that it can do low-altitude, low-speed and maneuvering flights with the same nose direction, especially vertical take-off and landing in a small area. Because of these characteristics, it has a wide range of uses and development prospects. In the military aspect, it can be used for ground attack, airborne landing, weapons delivery, logistics support, battlefield ambulance, reconnaissance and patrol, command and control, communication and liaison, etc. In civil use, it is used in short-distance transportation, medical rescue, emergency rescue, hoisting equipment, etc. However, compared with airplanes, helicopters have higher vibration and noise levels, larger maintenance and overhaul workload, higher use costs, lower speeds, and shorter ranges. And there are still a lot of technical difficulties in design and manufacturing! ”

Messerschmitt thought for a moment and laughed, "I see. In fact, Leonardo da Vinci drew an imaginary picture of a flying bicycle in 1475, which is the kind of helicopter you are talking about. It is a huge spiral made of sizing linen that looks like a giant screw. It rotates with a spring as the power force, and when it reaches a certain speed, it carries the body into the air. The driver stands on the chassis and pulls the wire rope to change the direction of flight. In 1907, the Frenchman Paul Kearney developed a full-size manned flying bicycle and successfully flew it in the same year. The helicopter is called Flying Bike. In fact, it is the helicopter you are talking about, it not only leaves the ground 0.3 meters off with its own power and completes the vertical liftoff, but also flies continuously for 20 seconds to achieve free flight. However, none of these so-called helicopters can be considered a real success, and they are too far from practical application. Can we really figure it out? ”

Xiao Weiguo nodded and said, "That's right, as long as our turboshaft engine is successfully developed." That's not a big problem. Because the power source of the helicopter uses a piston engine, it is inevitable that the engine power is low. If the specific power is low, the helicopter fuselage cannot be made of all-metal. In that case, it will have a short lifespan, slow speed, and poor application. So, everything will not be possible until there is a turboshaft engine. ”

At this time, the testers were already ready. The crew members were also ready, they came over to report the readiness to Xiao Weiguo and Messerschmidt and asked to take off!

Xiao Weiguo nodded and said, "Okay, I believe you all know how dangerous this test flight is!" So you have to be careful. If there is a problem, contact the radio immediately, and if there is an unexpected situation beyond the control of the aircraft, you should choose to skydive immediately. Each of you prepared a parachute for this test flight, but the risk was no less great! So, every one of you who participates in the trial will receive a special prize of $1,000, and your family will also receive $10,000 in compensation if something happens. However, I hope that your family would better not get the $10,000, and I hope that you will fly back with this test plane smoothly and get off to a good start in shaping our turboprop engines! Do you have faith? ”

As soon as Xiao Weiguo's voice fell, several pilots and test personnel who participated in the test shouted: "We are confident!" ”

Xiao Weiguo said with satisfaction: "Your spirit is commendable! This is our dragon soul spirit, our corporate culture has been deeply rooted in the hearts of the people! I am very happy and I wish you all a successful first test flight! ”

Messerschmitt also laughed: "Don't be nervous, everyone! Believe in our technical prowess, although this aircraft has undergone a lot of modifications, our aircraft is of good quality! I believe that even if one engine is removed, it will be able to take off and return home without any problems! We're here waiting for you to return! ”

The pilots and testers were very excited, although this test flight was very risky, but they also deeply felt the favor of the Dragon Soul Ordnance Enterprise, a thousand dollars of bonus is a huge bonus, except for the Dragon Soul Ordnance, which company can do this? In addition, participating in the test flight of the world's most advanced turboprop engine is a thing that can go down in aviation history, and who wouldn't want to?

Watching the eight crew members running to the M30 transport aircraft in small steps to convert it into a turboprop engine test aircraft, Xiao Weiguo couldn't help but feel a lot of emotion! Today is a day worth remembering, which made the turboprop engine appear in the world more than ten years ahead of schedule! From then on, it will change the development of the world's aviation industry! In particular, the air transport industry will enter an era of great leaps and bounds because of the emergence of turboprop transport aircraft. (To be continued.) )