Arthur was so excited that he pressed Paul's shoulder and exclaimed, "Great! Our M20 transport aircraft has now reached an altitude of 6,500 meters and is climbing upwards at a speed of 10 meters per second, and all the data are normal! At present, the engine speed is 5,000 rpm, the turbo speed is 60,000 rpm, and the lubricating oil temperature is 110 degrees! "The parameters are displayed on the cabin instrument panel.

Messerschmidt said with understanding: "Yes, in this way, our M20 not only increases the flight altitude, but also reduces fuel consumption, especially at high altitude, because the air is relatively thin, so the flight resistance is also small, and the maximum flight speed of the M20 should also be increased a lot, but this high-altitude human protection still needs to be solved!" Otherwise, there is no way to make passengers and crew members accept! ”

Paul nodded, "That's true, now we don't feel well even if we wear cold clothing." Because the air pressure at high altitude decreases, the human body is not able to adapt. I believe that Mr. Philip may have a solution, and when we go down, we will look into it and see how we can solve this problem. ”

The M20 continued to climb upwards amid the discussions, eventually reaching an astonishing altitude of 9,000 meters. To know how difficult it is for such a light transport aircraft to reach such a flight altitude, even some later fighters could not reach this flight altitude, and the M20 has already set a number of world records!

In the cabin of another M20 transport plane, Philip was also nervously staring at the pointer on the instrument, knowing that this was the first test of the turbocharger and there must be no problems. If turbochargers are successful and are massively fitted into aviation piston engines, another problem needs to be solved: the development of airtight nacelles and high-altitude flight equipment.

Although cold clothing and oxygen masks have been prepared today, this is only a temporary measure, and cold clothing can only solve the problem of heat preservation, but not the problem of pressure difference; Oxygen masks deliver oxygen so that everyone can not be bothered by the problem of hypoxia, but there is also a risk of poisoning if pure oxygen is absorbed too much. Oxygen toxicity is closely related to oxygen inhalation time, and the longer the time, the more likely it is to develop oxygen toxicity. Oxygen entering the body will produce oxygen free radicals, which are extremely active and flow around the body, attacking and killing various cells, causing metabolic and functional disorders of cells and organs, and can promote gene mutations to induce cancer. Of course, there is oxidation and antioxidation, which is a kind of self-protection ability of the human body. In the natural state of healthy people, the oxidative and antioxidant movements in the body are in a dynamic balance. Many pilots before World War II were bald, which was the result of inhaling too much pure oxygen.

When the M20 flies to an altitude of 9,000 meters, the role of the turbocharger begins to decrease, and at this time all the engine exhaust gases are used for work, although it can jump another one or two kilometers, but for the sake of safety, the maximum altitude of this test is up to 9,000 meters.

The members of the two test groups and the pilots are almost unbearable, the taste of flying at this altitude is really uncomfortable, you must know that every 1000 meters of ascent, the temperature drops by about 6.5 degrees Celsius, to 9000 meters, the temperature outside the cabin is only minus 20 degrees, the cabin is not a few degrees higher, the most important thing is the discomfort caused by the pressure difference. So after obtaining basic test data, the two M20s began to slowly descend in altitude and prepare to return to the factory airfield for landing.

When the plane descended to an altitude of 4,000 meters, everyone took off their masks and took off their thick cotton clothes and pants.

Billy said excitedly, "Mr. Philip, this test is very successful!" Although we all suffered a little, it was still very worth it! I'm proud to be part of the turbocharger testing work! ”

Philip is also happy, after all, the first test went very smoothly, and from the preliminary data obtained, the effect of the turbocharger is very good, I believe that as long as it is promoted, it will change the development of the entire aviation industry.

For the first time, during the First World War, the French engineer Auguste Rateau installed a turbocharger on a French fighter using a Renault engine. However, at that time, turbochargers were not yet taken seriously by the military leadership, and weapons manufacturers in various countries at that time still focused on the use of more powerful engines and more powerful machine guns.

American aeronautical engineer Sanford Alexander Moss has been conducting research on gas turbine engines. In 1918, he first installed a turbocharger on a V12 aircraft engine and leaped over Pikes Peak, Colorado at an altitude of 14.000 feet (4300 meters above sea level), breaking the previous world record. It was only before turbochargers were ready for widespread use that the First World War was over.

However, the turbocharger of the First World War was still very immature in terms of technology, there were many problems, and due to the end of the war, and its economy did not show itself, it fell silent.

After all, this is turbocharging technology, which is a very important technology in the history of aviation. Although supercharging technology also has its advantages, there will be a problem when using superchargers: due to the need to use crankshaft power as the power source of the supercharger, the output power of the engine is wasted to a certain extent, which has a certain impact on the performance of the engine. The supercharger technology is relatively mature, but the air intake efficiency is low, the crankshaft work consumed is relatively large, and the practicability is not ideal. Turbocharging technology has good economics, which is undoubtedly a great temptation for the world's major airlines in the deep economic crisis.

The M20 landed quickly, and the violent shaking pulled Philip back from his thoughts.

As soon as they got off the plane, Philip and his wife were enthusiastically surrounded by Messerschmidt engineers, who asked curious questions about the results of the test.

Philip and the others went back to the conference room to calculate and analyze the test results. The results of this analysis are surprisingly good, and the performance of the M20 has improved significantly after using the WZ-1 exhaust gas turbocharger.

From the point of view of flight altitude, the original M20 flew up to 5000 meters on the powerless, the engine power dropped too much, even the maximum speed is only more than 200 kilometers per hour, and after the installation of the exhaust gas turbocharger, at an altitude of 5000 meters, the M20 is full of power, the maximum speed reached 300 kilometers per hour, and at the height of 9000, the speed reached 350 kilometers per hour. That's a staggering statistic!

After calculation, the boost ratio of the WZ-1 turbocharger actually reached 2.9, which was 0.1 higher than the design index, and all the indicators were very good, the fuel consumption of the entire engine decreased by 10%, and at an altitude of 9000 meters, the available power reached more than 90% of the maximum continuous power.

As soon as these results came out, all the engineers widened their eyes and couldn't believe it!