Lu Bu told Pang Tong and others that the flying pot was like a kite. In fact, he knew very well that the so-called flying pot was actually a three-wing glider that many sports enthusiasts later fell in love with.

After drawing a drawing overnight, Lu Bu rushed to the morning and got together with a group of craftsmen, thinking about how to make a glider.

Gliders are different from balloons. They do not require extra kinetic energy and only use the wind resistance to achieve the purpose of flying into the sky.

When the aircraft takes off, three different resistances will appear in mid-air.

The first type is friction resistance.

Friction resistance is mostly determined by the appearance of the aircraft. The rougher the surface and wider the head, the greater the friction resistance.

Excessive frictional resistance will cause the aircraft to decelerate sharply or lose balance during flight, which is the most important resistance to overcome.

The other two kinds of resistance play a key role in the flight of the aircraft.

One of them is called differential pressure resistance, which is generated when the aircraft is flying in mid-air.

The air is divided by the aircraft, forming different pressure differences between the head and tail.

The tail pressure difference will be infinitely close to zero.

Appropriate pressure difference plays an extremely important role in maintaining the balance of the aircraft.

Differential pressure resistance is a parallel resistance, while another resistance that determines the altitude of the aircraft's navigation is named induced resistance.

Before Lu Bu came to this era, he also learned about mechanics.

Although what I learned is just the basics, at least I know more than people of this era.

The glider does not seem to have much technological content, but Lu Bu knows very well that the simpler the thing, the more refined it needs to be done.

Using the gifts of nature to send people to the sky, what is tested not only the ability of craftsmen to make aircraft, but also the skills of controlling gliders in the future.

The carpenter chose good firewood and polished the wood into solid round sticks.

Two carpenters are using ropes to try to tie the stick into a triangular skeleton.

Lu Bu stood beside them and watched.

When the two of them tied up a skeleton, Lu Bu said: "It is definitely not possible to fly into the air such a skeleton. Once the wind resistance is too large, it will definitely blow away the flying kite."

The two craftsmen raised their heads and looked at him in panic.

They didn't dare to ask more, but they knew that Lu Bu was right.

"There is a good way to fix the skeleton," said Lu Bu. "It is best to use nails, but we don't have nails, so we can only use your skills to create grooves and mortises on the sticks."

Of course, carpenters know how to open grooves and tenons, so they choose to use ropes instead of slotting on wooden sticks. They consider that it is difficult to slot and slot on triangular skeletons, making it difficult to achieve complete consistency of the bayonets.

Seeing the confusion on the faces of the two carpenters, Lu Bu asked: "Do you think the notch and tenon of the wooden stick are difficult to engage?"

"Wen Hou said," one of the carpenters replied: "It is indeed difficult to close the stick when it is opened in the notch."

"Then find a way to cut off the inclined chutes." Lu Bu said: "The tenons and grooves are both oblique, and the notches and tenons should be wide enough and long enough. A few more grooves should be opened in the connection. In this way, the force under the air will be distributed to different grooves. Under the uniform force, it is difficult to break and is more secure."

The two carpenters looked at each other and saw shock in each other's eyes.

They really didn't think about the way Lu Bu said.

After his guidance, the two craftsmen suddenly realized.

The two bowed to Lu Bu and said, "Don't worry, Mr. Wen, we must carve the grooves and mortises until they are tightly connected."

Walking away from the two carpenters who made the skeleton, Lu Bu came to the side of the cobbler who cut the animal skin.

Several cobblers were busy putting the animal skins into wooden barrels where saltpeter was stored.

After putting the animal skin in, steaming white mist emerged.

As soon as he approached the wooden barrel, Lu Bu smelled a strong stench.

When the craftsmen saw him coming, they all stood up and saluted.

"Why is it so interesting?" Lu Bu asked.

"Return to Wenhou." One of the craftsmen replied: "When the animal skin is made of nitrate, it does have a very strong smell. When the nitrate is finished, the smell will disappear."

"What kind of skin do you use?" Lu Bu came to the wooden barrel and looked at the rolled animal skin inside.

"It's sheepskin." The craftsman replied: "The sheepskin is tough, but it's a little thinner."

"Why don't you use cowhide?" Lu Bu said: "Isn't cowhide tougher?"

"The law of the Han Dynasty is not allowed to use cowhide." The craftsman lowered his head and replied softly.

He was also muttering in his heart that as the Marquis of Wen, Lu Bu didn't even know that he was not allowed to slaughter the ox at will.

"Is it because the ox is precious?" Lu Bu asked again.

"Yes!" the craftsman replied.

"The Hu people in the north can also raise cattle, but their cattle are not used to plow the fields, but are just used to slaughter and pick up the flesh." Lu Bu said: "I will ask someone to purchase cowhide from the north first. In the future, it is best to use cowhide."

The flying kite he told the craftsmen was actually the most primitive triangular glider.

It may not be easy for craftsmen to understand just gliders.

It is easier for them to accept it if it is a flying kite.

Since it is something to fly into the sky, of course, the better the cortical toughness, the stronger the soldiers and soldiers using them, the less unnecessary non-combat attrition occurs.

Just as he was watching the cobbler making sheepskin, Pang Tong came over: "Wen Hou has been watching the making of flying kites?"

"Actually, you can call it a glider in the future." Lu Bu smiled at Pang Tongyi: "Shi Yuan came just right, I happened to have something to discuss with you."

"What do you think about Mr. Wen?" Pang Tong asked.

"Beast skin is used for both gliders and balloons, and the armor worn by the soldiers is also used." Lu Bu said: "The use of cowhide is always allowed by the court. However, the wings and balloons of the gliders only have enough sheepskin to use. The sheepskin is thinner and it is easy to burst after going to heaven. I am wondering if I need to raise more cattle?"

"Breeding cattle?" Pang Tong said in surprise: "In today's chaotic times, although the population is small, there is not enough food to eat. Who can still raise so many cattle?"

"Cows and sheep will not consume too much food," Lu Bu said: "You can distribute young cattle to the people and let them breed them. When the cattle grow up and can be slaughtered, they will send people to the people's homes to purchase them. From now on, cattle and sheep, as special livestock, are not allowed to be sold privately, nor are they allowed to be slaughtered privately. They can only be sold to the government and slaughtered uniformly."

He then said: "We cannot fully control the governments in various places, and it is inevitable that some officials will gain benefits from it. If officials are raised too fat, the people will suffer. You have to customize local laws and restrict them. Kill what should be killed and withdraw what should be withdrawn. We must ensure that the officialdom is clear and we can go further."

"Wen Hou has a long vision, I will do it now!" Pang Tong agreed.
Chapter completed!