Bright Sword: Starting from the Improved Grenade

May 1943, 5, Dihua, Xinjiang.

"Minister Zhao, please look, this is the wind tunnel built using German equipment!"

Wu Ronglin pointed to the huge wind tunnel next to him and said with a smile: "It is 9 meters high, 396 meters long, and has a maximum diameter of 24 meters."

"Whether it's testing aerodynamic performance, engine performance under different airflows, or even the flight stability of missiles, it's all possible."

"Great."

Zhao Tianyang waved his hands excitedly. With the wind tunnel, he could finally let go and let the people below study it.

"Li Yuncai sent a telegram to Chief Designer Lin Tonghua."

Zhao Tianyang looked at Li Yuncai standing aside and said, "Don't they want to build Zhongyun No. 1 first?"

"Tell them that they can bring the plane over for the wind tunnel!"

"And Paul Schmidt, tell him the wind tunnel is ready!"

"Yes."

Li Yuncai nodded, turned around, turned on the portable radio and started generating electricity.

Then Zhao Tianyang turned his gaze to Wu Ronglin: "Professor Wu, can we make this kind of wind tunnel equipment ourselves?"

"It's possible, but I don't think it's necessary!"

Wu Ronglin said: "Compared with the direct current wind tunnel, which consumes a lot of energy, the recirculation wind tunnel, which saves energy and is not affected by external interference, is more suitable for us!"

"Recirculation wind tunnel?"

Zhao Tianyang touched his chin and thought for a moment: "Professor Wu, have you ever heard of a detonation wind tunnel?"

"Blast wind tunnel?"

Wu Ronglin was surprised and said, "What kind of wind tunnel is that? I've never heard of it!"

"To put it simply, the wind tunnel is driven by the energy generated by the explosion of a mixture of hydrogen and oxygen."

"Theoretically, the explosion of hydrogen and oxygen can generate a temperature of 8,000 degrees, which can allow the wind tunnel to reach a speed of Mach 30!"

"Hey... this idea is quite interesting!"

Wu Ronglin's eyes lit up and he became interested.

Generally speaking, there is a difficult hurdle to deal with in the development of wind tunnels, which is that "you cannot have both time and speed."

The meaning of this sentence is very simple, which means that the wind tunnel needs to be heated during operation so that it can simulate the real air friction effect.

However, in this high temperature and high pressure environment, the gas tank in the wind tunnel can easily disintegrate.

In order to prevent the gas tank from disintegrating, the experimenters can only shorten the wind tunnel test time, so the experimental data measured for each aircraft is very limited.

But if you want to extend the time, you have to reduce the pressure, then a new problem arises: when the pressure is reduced, the speed will also decrease.

This is the reason why "you can't have both time and speed". In order to solve this problem, Western countries currently generally choose to spend money, attempting to screen the most cost-effective wind tunnel through a large number of experiments. During this period, every hour of operation of the wind tunnel will burn 100,000 degrees of electricity.

Not to mention them, even the United States can’t stand this kind of burning!

Therefore, Wu Ronglin showed great interest in Zhao Tianyang's idea of ​​using the explosion of hydrogen mixed with oxygen to generate energy and use it to drive the wind tunnel.

"Minister Zhao, can you elaborate on this?"

"For example, when hydrogen and oxygen explode, how do we determine their safety value?"

"Haha, no problem, come on, let's talk over here!"

Detonation wind tunnel is a very difficult technology. Even the United States in later generations tried hard to study and learn it.

In order to explain the principle to Wu Ronglin, Zhao Tianyang discussed it with him for a whole week.

That day, Zhao Tianyang, who was discussing something similar with Wu Ronglin, stretched and was about to go for a walk when Li Yun quickly ran over.

"Minister, the 'Zhongyun No. 1' designed by Chief Designer Lin and his team has been successfully manufactured. Now we are waiting for you to inspect it!"

"What?"

Zhao Tianyang asked in surprise: "Have they finished blowing in the wind tunnel?"

"It ended two days ago. Mr. Schmidt is using the wind tunnel now."

Li Yuncai replied.

"Okay, get the car ready and let's go take a look!"

Because the aircraft factory prepared for Lin Tonghua and others was also in Dihua, Zhao Tianyang took about three hours by car to arrive at the "Dihua Training Aircraft Factory".

"Minister, you are here, please come in!"

As soon as the car stopped, Lin Tonghua ran out and pulled Zhao Tianyang into the aircraft factory without saying a word.

"Don't worry, I'll go!"

Zhao Tianyang broke free from Lin Tonghua's hand and reluctantly trotted after him.

As soon as he arrived at the aircraft factory and the runway for testing aircraft, Zhao Tianyang saw an unpainted and dark-colored aircraft slowly descending from the air.

After gliding for a while, it stopped.

"Hahaha, looks like there's no problem!"

"Yes, after so much research, we can finally put it into mass production."

Beside the runway, Gao Bangjun, Lu Xiaopeng, Zhang Guilian and others looked at the parked plane, tears in their eyes and discussed it in a lively manner.

"Hu~~"

Lin Tonghua, who also saw the plane landing, breathed a sigh of relief and pointed at the plane and said to Zhao Tianyang.

"Minister, the Zhongyun-1 has undergone more than ten flight tests and is now ready for mass production."

“Are there any specific data?”

Zhao Tianyang asked: "Let me see!"

"Have!"

Lin Tonghua shouted to Gao Bangjun: "Bring all the data here, the minister wants to see it!"

"okay!"

Gao Bangjun responded, took some data from Lu Xiaopeng and others, and came to Zhao Tianyang.

"Minister, this is all the data of our "Zhongyun-1" and the test data!"

"Ah."

Zhao Tianyang nodded, took the data sheet and started looking at it.

"Plane: Zhongyun-1."

"The aircraft is 11.95 meters long, 2.67 meters high, and has a wingspan of 15.85 meters."

“Total weight: 3.147 tons.”

"Maximum take-off weight: 4.536 tons."

"It can carry 8 passengers, 2 pilots and 1 navigator."

"The maximum speed in level flight is 349 kilometers per hour, and the flight time is 5 hours and 45 minutes."

"Engine: Imitation American R-1820-F nine-cylinder radial engine, 450 horsepower."

"The fuselage, wings and tail are all made of wood, covered with three layers of panels and then covered with cloth. Only the ailerons and flaps are made of aluminum alloy."

"As a small medium-range transport aircraft, it's pretty good!"

Zhao Tianyang returned all the information to Gao Bangjun: "The most important thing is that most of them are made of wood. They are very economical and affordable. You can mass-produce them."

"Great~"

"Woo woo~~Finally....Zhongyun No. 1 can finally be produced!"

When everyone present heard Zhao Tianyang approve the production, they almost jumped for joy.

Some technicians couldn't help crying when they thought about the hard experiences they had experienced in the past two years.

"Haha, okay, today is a happy day, stop crying!"

Zhao Tianyang patted the crying technician and said, "I'll treat you to a big meal!"