That night, after Lei Changye escorted Zhang Yichao, Zhang Yitan, Master Hong Wei and other backbones of the Guiyi Army onto the ship of the Flying Fish Lady, he announced to the whole ship that he must go to the Yalong River Valley to save the two people who went deep behind enemy lines and single-handedly subverted the death of the Xihu Empire.

This declaration deeply shocked the generals of the Guiyi Army. Except for Zhang Yichao, who arranged for these two to escape between the dead, he knew the details of the matter, and everyone else heard of Lei Changye's layout for the first time.

It turned out that when they enjoyed the top treatment of Shazhou City and Chang'an City, the cadres of the Baiyin Yi Army had already gone incognito and infiltrated Xihu to do a heroic feat that was rare in a century, subverting the Xihu Empire in one fell swoop and forever solving the troubles of the Tang Dynasty. What forbearance and greatness this is.

"Lord Lieutenant, we are willing to go into the Yalong River Valley, kill all the Xihu Youru Elite Cavalry, and rescue them!" Zhang Yitan said excitedly at the moment.

"Yes, I will not give up!" said the crowd.

"It doesn't have to be that way. Lei Changye shook his head, "It's too late in time." I'll help them escape on their own, we just need to pick them up at the critical moment. All you have to do is help me guard the various points on the ship while I help them, and watch the heavens at all times to see if they appear in the sky. ”

"Sky?" everyone was shocked.

However, Lei Changye didn't have time to say more, but set the course for the big ship, and after it flew steadily, he quickly ran to the secret room of his ship palace.

This time, he directly spread out the Mu Feiniao Chapter of the Mozi Five Elements Transcription Manuscript Dao Instrument Chapter. Since Wang Mang asked him for help, it showed that the situation at that time was very urgent. Originally, in the interface in his mind, Wang Mang had already decided to kryptonite, but this time he still chose to ask for help, indicating that the situation there was very bad, even if he brushed the jade talisman after death, he would be trapped in place. There is even the possibility of an infinite loop.

Lei Changye roughly imagined the situation of Wang Mang and Jia Xu, which should be a bit like the desperate scene when Wang Mang was beheaded by the Green Forest Army in the Blue Sea Star Plane.

Jesanzan Nezan, this wolf cub really can't be raised.

Now he can only seize the last bit of time to help Wang Mang build the simplest wooden flying birds, at least let them fly out of the Zedang Palace, as for the failure in the middle and fall to death in the wilderness, it doesn't matter, they will naturally brush the jade talisman to resurrect.

The Mu Fei Bird chapter in Mozi's Five Elements Ji describes the whole process of Lu Ban's manufacture of Mu Fei Bird, from the experiment to take-off to the failure and crash, all of which are depicted with a brief pen and ink. Lei Changye has seen the design of the wooden flying bird, which has a very complex wooden feather system. Lu Ban used a special light spirit wood to simulate the creation of an eagle's feathers, so that it covered all the wings of the wooden bird.

In the Wood Bird power system, he designed a drive system that is extremely complex to realize the action of the bird's wings flapping up and down, pushing the air, and using the principle of reaction to fly forward. The core of this drive system is naturally the virtual room wind array. As the core of the magic circle, this virtual chamber wind array produces a rotating hurricane to push the drive system to rotate and run, and Lu Ban converts the rotating force into a force that vibrates up and down through machinery, and realizes the flapping wings and flying.

However, although the wooden bird successfully ascended to the sky, it could not fly far, could not change direction, and was unstable when landing. If Lu Ban hadn't practiced, he would have been gone after the test. That's why he's not very happy with the design.

Lei Changye was not very interested in this design, and felt that it was too complicated. However, at that time, he didn't remember the aerodynamics of the plane very clearly, so he never had the courage to study the implementation method of this wooden flying bird. Now, in order to save his two favorite generals, he must muster up the courage to face the difficulties.

His brain domain has been strengthened by the two jumps of the middle fifth grade and the primary sixth grade, which is already very different from when he was in the third grade. His memory has also become extremely strong, and he can search the depths of his mind for information he has seen on the Internet in the past.

In high school and college, he had seen how propeller planes worked. He repeatedly looked at Lu Ban's design drawings of the wooden flying birds, and felt that the other designs were not very reliable, that is, the design of this virtual room wind formation to promote the rotation of the drive system was very practical.

If these two imaginary chamber wind formations were converted into the power to push the propeller blades to rotate, and Wang Mang could remove the material of the camel cart, make a five-bladed propeller made of wire willow material, and then make a pair of wings similar to a monoplane propeller aircraft, would it be possible to make a simple propeller aircraft?

In the process of drawing, the principle of the propeller aircraft in his mind gradually became clear: the single blade is a slender wing-shaped blade with a twisted angle, and the blade angle is equivalent to the angle of attack of the aircraft wing, but the blade angle is the twisted angle of the propeller tip and the rotation plane that gradually changes to the propeller root.

When such a propeller rotates, two forces are generated, one is the aerodynamic force that pulls the propeller forward, and the other is the reaction force generated by the propeller twist angle pushing the air backwards, which jointly propels the aircraft forward.

Lei Changye immediately drew a three-dimensional view and section of the airplane's wings. The surface of the wing is convex, causing the surface air flow tube to shrink and the air velocity to increase, creating a flow velocity difference with the air flow on the lower surface. According to Birch's equation, the greater the fluid velocity, the lower the pressure. As a result, there is lift on the wings.

Originally, in order to increase lift, the general early propeller aircraft were two-wing or even three-wing. However, Lei Changye seriously suspected that the wooden flying bird that had installed a small array of virtual room wind only needed one wing.

After the wings and propellers were all in place, he began to redesign the entire propeller aircraft in his mind and began to draw the overall picture of the propeller aircraft. After the power system and flight system are completed, he only needs to design the ailerons and flaps and other control systems, and link them to the rudder through mechanical transmission, basically an ultra-simple propeller aircraft is built.

Now the only question is how to activate the Void Room Wind Formation.

The activation of the Void Room Wind Formation can be driven by jade talismans, or by a master like Wu Daozi and the power of the supreme mana. The Void Room Wind Formation is a very unique design on the Luban Wood Flying Bird. It was the first time that Lei Changye had really used this kind of exquisite void room wind formation.

According to the records, it can produce a stable and controllable whirling force, and it does not need forty-eight people to activate it like the Void Room Wind Array. In Luban's records, he can be driven by mana alone.

Lei Changye thinks that such a small array that is close to the people should be like the Heavenly Pivot Exorcism Array, which can be activated by relying on a Heavenly Thunder Talisman. However, because the Void Room Wind Formation is driving the real propeller to run in kind after all, it is impossible for a Heavenly Thunder Talisman to last as long as a camel cart.

But Lei Changye doesn't need Mu Feiniao to last long, he only needs to hold on for a day or two and fly out of the Yoru area.

He quickly checked all the designs twice, and then sent the workshop drawings with the secret iron willows hidden in the ship palace, and made a batch of models of the Sanpin workshop drawings according to his design, and he assembled them and took a general look, which was almost the case.

The current time can't make him keep improving. Wang Mang and Jia Xu will be killed by Jiesang Zannezan and them at any time, and they will fall into an endless loop, which is definitely not what he wants to see.

He rolled all the design drawings into a roll, picked up the model he made, and quickly drilled into the drawing box and entered Loulan City.

Wang Mang's painting body was still anxiously pacing back and forth in Loulan City, and when he saw Lei Changye coming in, he hurriedly greeted him.

"Alliance leader, I have thought about it, if we die, can we go back to Valhalla, so that you can pass us on to the royal housekeeper again, and we can continue to follow you. Wang Mang asked eagerly.

"Don't bother, you'll get out alive and it's over. Lei Changye was still a little moved. Wang Mang has to follow the rhythm of his work even if he dies, he has never been so loyal to any emperor of the Han Dynasty.

"Do we still have a chance?" Wang Mang was overjoyed.

"Here are the drawings I designed for you. Lei Changye handed the drawing in his hand to Wang Mang, "This is Master Lu's sketch of Mu Feiniao, I will modify it slightly." ”

"Mu Feiniao, didn't you say that Master Lu was abandoned?" Wang Mang took the drawings in ecstasy, knelt directly on the ground, and bowed down on the ground to watch.

"His other designs are not very reasonable, but the core power system is very good, is this magic circle, have you seen it?" Lei Changye pointed to the general design drawing.

"What is this magic circle, it is so complicated?" Wang Mang had never seen a small formation in the void room, and he looked a little dizzy.

"You don't have to understand, you just need to remember how to draw. Just activate it with the Celestial Thunder Talisman. I designed a vertical bucket here, you send the heavenly thunder talisman directly from the vertical bucket into the drive box, you can directly activate this magic circle, you must not directly use your hand to shoot the heavenly thunder talisman on the magic circle, once the propeller turns up, you will be gone. Lei Changye reminded.

"Remembered. Wang Mang was frightened.

"Tell Jesan that you have to dismantle the cart and study the internal structure, and you can use the parts of the cart to make wooden birds. Lei Changye said in a deep voice.

"I've seen your design, and the hardest part is this power circle, you drew it in great detail, and I'm fine. Wang Mang nodded again and again.

"If there is anything you don't understand about the magic circle, you can ask Jia Xu, he knows more about the magic circle. Lei Changye patted him on the shoulder vigorously, "I'm sure you can do it." ”

"Alliance leader, don't worry, look at me. Wang Mang's confidence doubled, and he patted his chest hard.

"Here I wrote about the method of piloting this wooden bird, you can look at it a little, compare it with the design drawing, you should be able to understand seven, seven, eight, eight. ”

"Alliance leader, isn't there any writing here about how to turn and land?" Wang Mang hurriedly glanced at the use of the wooden flying bird on the design drawing, and asked a little strangely.

"You don't need to turn or land, you just fly. Lei Changye took out the map and spread it on the ground, "Fly out of the Yoru area and go in this direction, I will drive the Flying Fish Lady boat to pick you up." ”

"Alliance leader, you personally sailed the boat?" Wang Mang was flattered.

"Of course, how can I be willing to leave you two good generals. Lei Changye said with a smile.

"I knew that I had meat to eat with the alliance leader. Wang Mang excitedly said Zixin's mantra.