That night, Charles left the apprentices' residence at ten o'clock. When he returned to the dormitory, he found an invitation letter tucked under the crack of the door.

He opened it and saw, good guy, Ji Shijun is going to heaven.

The next morning, after having breakfast, Charles rode a motorcycle to a factory a few kilometers away from the school.

The factory was heavily guarded. There were several layers of barbed wire and trenches outside. The firepower of the bunkers blocked all the space from the firing holes. Even three sets of quadruple water-cooled Maxim were installed on the top.

With the invitation letter, Charles passed the various checkpoints and was led by the staff to the end of the runway next to the Slime Aircraft Factory ("Shi Fei" for short).

Today's Shi Fei was very lively. The reception staff told Charles on the road that the first aircraft they produced would fly for the first time today.

Charles saw Professor Erbach here on the runway. The principal smiled brightly today. He was talking to several professors from Shield Bridge College by a small white plane, surrounded by many Shi Fei staff and locals. officials.

After seeing Charles, Professor Erbach hurriedly called him over, and proudly introduced the aircraft jointly developed by Shield Bridge College and Shi Fei.

This is a single-engine lower-wing single-wing propeller aircraft with a conventional layout, two front and rear side-by-side seats, three front landing gears, and a total of six external hardpoints under the wings.

"This is a trainer plane," said Professor Erbach with a smile. "It's an airplane that teaches students how to fly."

Charles sighed: "That's not bad. Now the new driver training task is very heavy, and it is much more convenient to teach without it."

He reached out and patted the fuselage and probed with his mental power.

The keel of the plane is made of aluminum alloy, and the outer shell is a hard slime glue with a metal mesh for added strength.

The nose is an all-aluminum radial 9-cylinder piston engine with 300 horsepower from the nameplate.

Professor Erbach continued: "It can also be equipped with external weapons to participate in combat, and it can also be equipped with a camera to take pictures from the sky."

Charles nodded and said, "I think it's possible to install a spray system to spray pesticides."

Professor Erbach laughed twice, and then said, "This year, our academy will focus on it at the carnival. We have other models to launch next, so we won't need to buy planes from the elves in the future."

Charles smiled slightly. The principal didn't know yet that the planes sold by the elves were all produced by someone's company.

At this time, two test pilots came over. One of them, Charles knew, was Olympus from Dragon Airlines, and the other Charles also knew, and was the deputy head of the "Dragon Group that makes the sky more lively". Smith.

Ji Shijun followed them and greeted Charles when he saw him.

Charles smiled and said to Ji Shijun: "Wait a minute, are you listing the ticket?"

"Don't say it." Ji Shijun whispered to him, "Someone has really thought about building an airdrop pod for external wings."

Charles listened to a black line.

After the test pilots were seated, everyone left the end of the runway and sat down in the auditorium on the side.

There was no ceremony, but after Ji Shi communicated with the two test pilots using a military messenger, he ordered to take off.

The roar of the engine sounded, and the white plane quickly galloped on the runway, getting faster and faster.

At that moment, the plane left the ground and flew into the blue sky.

There was a thunderous cross talk in the audience, and everyone had a smile on their faces.

The trainer made a few turns in the air, made a few S-shaped maneuvers, pulled up and dived a few times, and then landed firmly on the ground by itself.

Ji Shijun brought his men over to celebrate with the test pilot. Professor Erbach pulled Charles aside and walked to a nearby factory.

On the way, the principal said, "Ji Shijun wants to set up an independent mathematics school in the branch campus. What do you think?"

GuCharles nodded and said, "I agree. With the development of technology, mathematics is becoming more and more important. Now the cultivation of mathematics talents cannot keep up with the pace of technology."

"Yeah." Erbach sighed, "We encountered a lot of mathematical problems in the development of this aircraft, and finally we asked the dragon to help. With their help, several places built calculation formulas. Let's catch up with this year's carnival."

"But now we have a huge problem."

Charles asked suspiciously, "What's the problem?"

He thought that if the college had a mathematics department, it would not be a big problem, and even if there was a problem, it would be a small problem.

Professor Erbach said depressedly: "The best math teachers are giant dragons, but the giant dragons who are capable and willing to teach have been poached by the Lerick Kingdom many years ago!"

Charles was speechless for a moment. No matter which world or period, talents are the most precious. Auston I used the power of the country to hire dragons, and Ji Shijun and Professor Erbach were incomparable.

So Professor Erbach asked Charles: "You have a good relationship with the dragons. Can you help us find a few dragons who are knowledgeable in mathematics?"

This time Charles was in trouble. Except for Professor Babbage who owed a large amount of debt to teach and make money to pay off the debt, what the other dragons do is entirely up to their own preferences.

Among them, those who love to do business are in the Chaowei Blue Dragon Consortium, those who love to fight are in the Rurik Air Force, and those who love to toss with slimes are now making every effort to develop slime semi-permeable membranes.

And those giant dragons who love to teach mathematics were invited by Philip more than 300 years ago to become mathematics teachers in middle schools and universities all over the Rurik Kingdom.

Because of this, the overall level of mathematics in the Rurik Kingdom is very high, which makes various industries develop extremely rapidly after Charles invented the wind turbine and started the industrial revolution.

At present, the technological development here has encountered a mathematical bottleneck, and many problems cannot be effectively solved.

Professor Erbach gave an example of calculating lift.

In order to design the wing, they did a lot of experiments in the wind tunnel to obtain data, but when they were processing the data, everyone turned their eyes in circles and had no way to start.

The lift provided by the wing is related to the lift coefficient, dynamic pressure and wing area. The lift coefficient is affected by many parameters such as the wing geometry, installation angle, flight elevation angle, and airfoil. The dynamic pressure is related to air density and true speed. , the design of the wing needs to take into account the relationship between the lift coefficient and the drag~lightnovelpub.net~ Finally, Professor Babbage invited his classmates to help him come up with an empirical formula that can be used, which made the aircraft not rely on various improvisations. God.

After listening, Charles could only say: "Let me ask, I can't guarantee this, because the dragons are very busy recently."

Since acquiring the technology of the sky island on another planet, the dragons have become a little fanatical with the ambition to build a huge sky island.

At this time, the two came to a factory building, where there was a new aircraft being assembled.

The beauty of this plane... Charles declined to comment.

Its fuselage is like a box puffer in the sea. It looks square from the front. The nose is slightly curved forward, and the fat fuselage is retracted to the tail in the rear direction.

Its characteristics are that an engine is installed near the root of the left and right wings of the rectangle above the fuselage, an oblique rod is supported under the fuselage to the middle of the wing, the rear tail is "H" type, and the whole The fuselage skin is aluminum.

Professor Erbach said: "This is our latest transport aircraft, and by our calculations, it can carry more than the existing biplane, and it is expected to carry three tons of cargo, or 20 passengers."

"At the same time, it can fly faster, and it can outpace the biplane by a lot."

Charles exclaimed: "If it can fly successfully, it will be a major achievement."

Professor Erbach said: "It has completed the dragon drag flight test. The unpowered glide and landing have been successful. It is expected to be ready for test flight in half a month."

Charles thought for a moment and said, "If the final test flight is successful, my airline will buy ten cargo and ten passenger planes for trial use in the first batch. If the performance is good, I will add more orders."

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