Philip nodded and continued: "We have a design boost ratio of 2.8, which is a high boost ratio turbocharger. Our M20 uses a BMW factory aero piston engine, which is a four-stroke gasoline engine with a take-off power of 515 hp and a maximum continuous power of 470 hp in standard atmospheric conditions on the ground, and a maximum continuous power holding altitude of 4875 meters. Since the turbocharger is not obvious in the low-speed phase, we mainly test the data of the turbocharger when the M20 flies to an altitude of more than 3000 meters, and then analyze whether it meets the design indicators. ”

In addition, the calculation of the characteristic parameters of the turbocharger is also an important part. Since the exhaust gas turbocharger is composed of a turbine and a compressor, the compressor is a single-stage centrifugal type, and the turbine is a radial type, the stable operation of the exhaust gas turbocharger must meet the three conditions of turbine and luck machine energy balance, flow balance and rotational speed. It is very difficult to calculate the characteristics of the compressor purely by theoretical methods, so we use the method of practical testing to obtain the characteristics of the compressor. By plotting the compressor characteristic curve, the correlation between the air quality flow, compressor efficiency, compressor speed and compressor boost ratio of the compressor is obtained. We will install a flight parameter recorder on the M20 transport aircraft for flight testing, which will record engine and supercharger parameters such as speed, throttle position, intake pressure, intake temperature, boost pressure, boost temperature, exhaust temperature, lubricating oil pressure, lubricating oil temperature and coolant temperature in real time. ”

As soon as Philip's words fell, Messerschmidt hurriedly said: "In this case, then let's hurry up and test it, I am also very interested in the test results of the WZ-1 turbocharger, if it can be installed on the M20 transport aircraft, the performance of the M20 transport aircraft can be greatly improved." ”

Philip nodded, "Okay, we're going to have to install the turbocharger and test instruments first, which requires a lot of assistance from the engineers here." In addition, it is necessary to arrange a special person to record the test data in real time during the test process. Mr. Messerschmidt, do you see? ”

Messerschmitt looked at the engineers and then said loudly, "Billy, Arthur, Cruise, the three of you are responsible for cooperating with Mr. Philip and David and Paul in carrying out this test. ”

Then Messerschmidt said to Philip: "Philip, Billy is a senior engineer of our company's aero engine, Arthur also has in-depth research on aero engines, and Cruise is an expert in test testing. ”

Philip looked at the three of them, and then said: "Three, today's test is very important for us, the turbocharger is a precision machine, you need to pay attention to the fact that during the test, the maximum engine exhaust temperature does not exceed 1000 degrees Celsius, the engine vibration does not exceed 35 G, the turbine speed does not exceed 200,000 revolutions per minute, and the lubricating oil temperature must not exceed 150 degrees Celsius." ”

All three nodded earnestly, and Billy said eagerly, "Don't worry, Mr. Philip." We'll make sure we're going to do it well. ”

Philip nodded and said, "Okay, let's go install the turbocharger and test instruments now." ”

Fortunately, because the M20 transport aircraft is designed to leave a relatively large space in the engine compartment, so it did not take much effort to install the turbocharger and some instruments that are not too large, but it took a lot of effort to connect the turbocharger and the piston engine.

Two M20 transport aircraft were used for this test, Philip in a group with David and Billy, and Messerschmitt in a group with Paul, Arthur and Cruise. Two M20 transport aircraft flew lightly from the runway into the blue sky to begin its test journey.

Under the action of the turbocharger, the M20 transport aircraft constantly launched a new assault. Originally, the M20 transport aircraft could only fly up and down 5,000 meters, and then it was no longer able to climb up, but today both M20s easily broke through this altitude.

Inside the cabin, Messerschmitt excitedly shouted: "God! The role of the turbocharger is too powerful! In my opinion, it just flies at an altitude of 10,000 meters, and there is no problem! However, now we have to put on protective suits and oxygen masks, the oxygen content at this altitude is so low that the temperature seems to be unbearable, and I feel a little overwhelmed. ”

After Messerschmidt said this, everyone felt uncomfortable. Since the cabin of the M20 transport aircraft is a non-airtight cabin, everyone also prepared a set of winter suits and oxygen masks. It is important to know that the height that the human body can generally withstand is only about 4,000 meters, and more than 5,000 meters need to take protective measures. For example, civil airplanes have airtight pressurized cabins, while fighter pilots have special anti-load suits and oxygen systems.

However, at this time, high-altitude compression suits have not yet appeared, so they can only wear cold-proof suits to keep warm and wear oxygen masks. Historically, the British developed the first generation of high-altitude pressurization suits in 1933. In October 1934, the best pilots from all over the world gathered in London to compete in the International Air Competition from London to Melbourne. In order to win the championship in this competition, the American Best has made quite adequate preparations. As early as 1931, he realized in his own flight practice that the higher the plane flies, the faster it can fly, but to fly in the stratosphere, the pilot must wear special clothing and hats to protect against the cold, oxygen, shock and pressure. Best hired an engineer named Goodrich to make a sealed garment out of parachute canvas and a helmet out of lead for $75. But when Post wore this suit to the decompression chamber for testing, as soon as he was pumped, the suit crumbled, and a slit cracked at the waist, and the world's first flight suit ended. The second flight suit was made in a hurry and immediately tested, and Best was sweating profusely from it, so he had to take it off. While making his third flight suit, Goodrich's friend Coreri came up with a clever idea. He divided the flight suit into two layers, the inner layer was made of a thicker rubber bag, which could exert a certain amount of pressure on the human body when inflated; The outer layer is made of ordinary canvas to make the shape of the garment to limit the shape of the inflated rubber bag. In August, Best wore this flight suit to the sky for a circle, making it the first flight suit to really go to heaven.

In the gap between the clothes of the crowd, Paul said confidently: "With the turbocharger, it seems that our cabin also needs to be improved, otherwise how can people stand flying too high!" Mr. Philip's design is so exquisite, I originally thought that our Bavarian Machinebuilding and Bavarian Aircraft Factory are the most advanced in the field of aviation industry and technology, but now it seems that the Dragon Soul Aircraft Manufacturing Company has greatly surpassed the German aircraft manufacturing company! ”