The air was hot, there was a lot of dust suspended, and the ground was covered with iron filings, but none of this could stop the burning eyes of the crowd.

The metal object in front of you is still rough on the surface, but it has a preliminary streamlined design.

The object is gourd-shaped, one-meter-sized, and made entirely of rough iron. On the big belly at the back, a large hole (air inlet) was opened, and on the pedestal, two low-grade spirit stones were inlaid with them.

The "hoist" as a whole is composed of more than a dozen 'parts', which are riveted to each other.

The formation pattern arranged by high-grade dark iron led out from the two spirit stones and submerged into the inside of the gourd.

Huang Mingshan explained to Zhang Shengde and Zhang Shengye: "This is a wind turbine, designed using a new mathematical method. This time, the fan used not only the wind formation, but also the flame formation.

As the saying goes, "fire borrows the wind, and the wind helps the fire", after the wind and fire cooperate with each other, the efficiency is increased by about 4 to 5 times.

In addition, after the combination of wind and fire, the inside of the abdominal cavity of the fan forms a wind roll mode, which can well reduce the internal temperature of the fan and ensure the safety of the fan. ”

Zhang Hao turned around and asked, "What is the design air volume and wind speed?"

"The design air volume is 10 cubic meters per minute, and the wind speed is 10 meters per second. ”

"Actually?"

"The reality is not measured. And we don't know how to measure it. Huang Mingshan was a little embarrassed.

"I didn't know how to measure it, so I researched it. I don't believe I can produce a fan, but I can't measure the air volume of a fan. Zhang Hao didn't help the seedlings, and directly said how to measure. In fact, it is not a simple matter to measure air volume.

Measuring air volume, you need temperature, pressure, density, and so on, and now it's all a blank.

Everything needs to be developed from scratch little by little.

Of course, in this process, Zhang Hao will provide some inevitable guidance appropriately.

After a pause, Zhang Hao said again: "Start the fan and see the situation." ”

Huang Mingshan pressed the spirit stone neatly to activate the formation. At the mouth of the gourd, there is a wind flow ejection. You can see the dust suspended in the air being blown and rolling, and the wind gradually sweeping through the house.

Zhang Hao put some confetti at the mouth of the gourd, roughly estimated the wind speed through the confetti, and finally nodded with satisfaction. "The wind speed is about 9 meters, and the air outlet is 8 centimeters in diameter. 90% matching of drawings and wind turbine data. You're qualified.

Each person will receive a bottle of Tsukidan and go home to rest.

Tomorrow is a day off, and think carefully about what you have learned in the past few days. ”

Huang Mingshan and the others took the pill and left quickly. Soon only Zhang Hao, Zhang Shengde, and Zhang Shengye were left.

Zhang Hao picked up the drawings sorted out by Huang Mingshan and others, and came to Zhang Shengde and Zhang Shengye, "Dad, second uncle, this is what we have achieved these days." ”

Zhang Shengde circled around the fan, felt the consumption rate of the spirit stones, and was a little surprised, "These two spirit stones are enough to support the operation of this fan for two days."

And the air volume of this fan is much, much larger than that of the current fans. ”

"Yes. That's the power of 'math'. ”

"Mathematics?" Zhang Shengde and Zhang Shengye said in unison.

"It's the book of reckoning I got from Master Mingxu Daoist, but we've made some improvements and extensions. After a pause, Zhang Hao handed the drawing to Zhang Shengde, "Dad, such a fan is enough to replace the bellows."

The bellows occupy a large area, require frequent maintenance, and require a lot of manpower, and the bellows can no longer meet our current production needs.

It's time for a change. ”

Zhang Shengde looked at the drawings and thoughtfully said: "How much does it cost to produce such a fan?"

Zhang Hao spread his hands: "I'm not sure for the time being, but I use ready-made materials, and the cost price is not high." ”

Zhang Shengde thought about it for a while, and suddenly smiled: "In this way, Xiaohao, the production problem of the fan will also be handed over to you." It just so happened that the family had recently absorbed some craftsmen from the Qian family, and there were plenty of people. ”

"I don't want the craftsmen of the Qian family, I want trustworthy and capable people in the family, preferably those who grew up in the family. ”

"No problem!"

............

said that Huang Mingshan left the mine and rushed home. From afar, I saw a faint silhouette in the window.

Knocking on the door, the husband and wife looked at each other silently.

"I'm back. Huang Mingshan said quietly.

"It's good to be back. A bright smile bloomed on his wife's face, and only her slightly red and swollen eyes showed that the woman had just cried.

At this time, the clothes on Huang Mingshan's body were almost in tatters, and after a busy day, especially at the end, he had to smelt, forge and so on himself, which made Huang Mingshan seem to be back to the way he was a few days ago - it was dark when he went home every day.

Entering the house, Huang Mingshan took out the porcelain bottle from his arms and said softly: "Top-grade Zhujidan!"

His wife was not moved by Tsukidan, but held Huang Mingshan's hand.

Huang Mingshan's hands were full of blisters, as well as burns.

"It's okay!" Huang Mingshan hugged his wife, "From today onwards, I can say for sure that our fate has changed." I misunderstood the young master before, we are participating in a great thing. ”

"Hmm. I'm hungry, I've got food left. ”

In the middle of the night, a family of three quietly enjoyed the warmth.

............

It was another morning, and many craftsmen of the Zhang family were crowded.

This morning, everyone is on holiday, because Young Master Zhang Hao Zhang wants to select some elites from among the craftsmen.

This caused a huge repercussion.

Zhang Hao himself may not know very well that the seven people including Huang Mingshan he selected earlier have become live advertisements.

Instead of working, learning new knowledge is rewarded handsomely every day.

This has long made everyone's eyes red.

Now, is it finally your turn?

"Quiet!" Zhang Hao shouted, and the scene was instantly silent.

"This screening rule, under the age of 20, the cultivation has reached the fourth level of qi refining.

Those with a certain foundation in formations and runes are preferred.

Excellent forging technology is preferred.

Those who are ingenious or have a skill will report and investigate separately.

In the end, 50 students were selected based on merit. ”

Before the words fell, many old craftsmen were not satisfied.

"What a noise!" Zhang Shengye was in the scene, and suppressed the scene as soon as he exited. "Is it that the salary I have given you more recently has made you forgetful?

You, come out!"

Zhang Shengye pointed out a craftsman, and the craftsman was a little trembling.

Zhang Hao knew this person, and he was one of the craftsmen who first forged the dark iron in front of Zhang Hao.

Zhang Shengye scolded sternly: "Zhou Da, let me ask you, how much has your salary increased in the past ten days?"

"That...... Almost three times more. ”

"So, how much have you contributed to the family?"

"Uh...... This ......" Zhou Da suddenly blushed and couldn't say a word.

Zhang Shengye snorted coldly: "Zhou Da, I've been paying attention to you for a few days, you've been a little lazy lately! ”

Zhou Da suddenly didn't dare to speak. Although they are also craftsmen, it is clear that mining has a lower salary and a lower status. It's a technical job that's in charge of forging.

Zhang Hao quickly recruited 50 people, but Zhang Hao looked at everyone and said lightly: "Of you 50 people, you can only leave 20 people in the end!"

Now start working in groups of 5 people and choose your own team leader.

Time, a moment!"

Soon, 8 groups appeared, and 10 people were scattered, refusing to admit defeat to each other.

"You're eliminated. Zhang Hao coldly announced the final trial.

Ten people were stunned.

"I don't like people who don't know unity. Zhang Hao said, glancing at everyone, "You are just ordinary people, only when you are united, it is possible to go further." ”

The ten people began to plead, but Zhang Hao did not let go.

When the ten people finally left, Zhang Hao said to the rest of the people: "Come and watch the drawings, ask me if you don't understand."

Tomorrow, Huang Mingshan and others will also come back and explain to you.

Starting tomorrow, you will begin to learn to craft items according to the blueprints, and only the best four will remain.

Remember, from now on, you are a group, a group, and I am looking at the achievements of the group, not the individual. ”