A brand new stove rises from the ruins.

After learning from the previous lessons, and even holding the blueprint provided by Rurik, Kawei was confident. Of course, in order for the furnace to operate smoothly, Rurik himself simply rooted in the construction site.

Continue to train those kids? Of course it is.

Rlik entrusted the task to his mercenaries, who would carry out the most rigorous training for the children, and he really couldn't be guilty of being present as a supervisor every day.

As a supervisor, he oversees the construction of the furnace, and as a technical consultant, he always answers questions about Kawei, who is holding the blueprint, and gives advice to the construction workers.

With thirty strong mercenaries, they became rather cheap labor. They sorted and stirred the clay to make clumps that resembled bricks, piled them up one after another, and finally piled up into a chimney-shaped stove.

Clay has not been sintered for a long time, it is now a very fragile existence. If it has been burned for a long period of time, it will become a very solid existence.

Although it is sturdy, it will experience continuous erosion and damage from molten iron and **** during a long operation.

Just like the collapsed furnace before, although it has unexpectedly achieved everything a blast furnace needs to have, it naturally inherits the challenges that a blast furnace will face.

The place where the furnace collapsed was at the fragile waist, which was abruptly broken by molten metal.

Therefore, in the construction of the new furnace, Rurik's plan was to make a furnace with a thick bottom and a cone-shaped structure as a whole.

Is it all right with just a tapered structure?

Do not! What Rurik needs is a furnace that can be used for a long time, not a defective product that collapses again in ten and a half months.

The most important thing is the refractory inside the furnace.

For the furnace that collapsed before, the reason for its collapse was left to Rick's analysis. Unexpectedly, Kawei still used the old idea of smelting bronze, the so-called paving ordinary iron ore inside the furnace as a refractory material. If it is just smelting bronze, it is completely suitable. However, the smelting temperature inside the furnace must have reached the level of smelting pig iron. The so-called refractory material has already melted into a part of the molten iron.

Even as the clay of the furnace wall, its resistance to high temperature is greatly reduced under real high temperature conditions.

After all, smelting pig iron is really a smelting miracle spontaneously created by the Ross people. It is undeniable that Rurik played a very important theoretical role in this accidental miracle.

Now the real theorists have begun to build new furnaces.

Even the earth blast furnace, in order to resist the corrosion of molten metal, it is necessary to use more high-temperature resistant materials to make an extremely fire-resistant inner tank.

Are there any suitable materials?

In theory, ordinary clay is added with some aluminum metal, so that the clay can be fired into cheap refractory bricks.

Where does aluminum metal come from? Corundum must be the best source.

But wait a minute! The mountainous area near Roseburg is rich in iron ore and a small amount of copper ore. As for aluminum...

If corundum can be obtained, the construction of the furnace will become very fast.

The fact is that Rurik was unable to find suitable refractory materials in the fjord of Roseburg, but refractory materials are not available. It is located at the settlement of Elon Orava, a distance of 180 kilometers in a straight line. The chromite ore there is an excellent refractory material in itself!

Presumably the blast furnace can smelt it into sponge iron. If it is smelted into molten metal, it would not work without 1800C. The short-term limit temperature that can be reached in a charcoal or coal-burning earthen blast furnace is only 1450C.

To obtain chromite, one had to send a ship to the north to pull it back.

The solution of this key problem naturally fell on the shoulders of the Gould family.

Under Rurik's instruction, a cargo ship carrying a batch of fish left the pier of Gould's house. Her target was Elon Orava Fort.

All the catches were bought by Lurik, and the internal organs were removed, and they were roasted with fire to resist decay.

These catches were actually rewards to the Corvin people in Elronburg, and Lurik wanted to take away a batch of pure ore and use fish to buy his servant's labor. Oh, of course he can give an order to order his servants to send an additional batch of ore as tribute.

Since he wants to spread the idea of "the spirit of contract" among the tribes, as a person of great status, Rurik consciously needs to pay attention to the contract for his servants, and hope that other tribes can understand the contract. important.

The ships have gone to sea, and even if the weather is clear and the waves are unhappy, they will have to return in five days at the earliest.

The furnace will continue to be built before the high-temperature resistant chrome ore is laid in the furnace.

The furnace mouth is designed to converge inward, it can only allow a slightly thin adult to enter, and the internal space of the furnace is significantly larger.

The narrow furnace mouth is to be able to fill while keeping the temperature as close as possible.

Even Rurik hired the tribe's stonemason who was good at carving monuments, chiseled a granite slab, and made a hole in the slab. This is the lid of the stove. The so-called leaving enough outlet for the exhaust gas can ensure the extreme lock temperature of the stove.

The construction of the furnace is in full swing, as long as the cargo ship transporting the ore returns to the port, the final work can be carried out.

Kawei and the mercenaries held large wooden hammers and rammed the dry clay deliberately piled outside the furnace shell.

Since three days have passed since the stacking of the furnace, the wet clay has become naturally dry, and only ramming can make it stronger before being sintered.

In this way, a small blast furnace with a taper of 80 and a height of two stikas, only from the outside, it has tended to succeed.

However, a doomed rain gave the unfinished stove the initial challenge. Thanks to an immediate shelter, the furnace was not eroded by rain.

And this rain really interfered with the transportation of chrome ore.

What can you do to Rurik? Even in such rainy weather, the children's training was forced to suspend, and they stayed in their homes one by one, waiting for the rain to end. The entire Ross tribe, with only a few brave men, rowed to a few bare little desert islands near Roseburg, and they set up dried fish hoping to catch a few fish.

Due to the rainfall, the production work in Roseburg was temporarily suspended, but fortunately the rainfall lasted only two days.

The rain is not big, but the scale of the sweeping is the entire Nordic world. If anyone likes it, no one is more like farmers everywhere. They are completely dependent on the sky for food. They were worried that the late planting season would lead to a serious reduction in production this year. A rain nourished the oat seedlings, which was a relief to the farmers.

Rain is so, what else can I do?

As a distinguished guest, Rurik is willing to take Clavasson's home for a long time, and by the way, he will guide this old guy to make a "centrifugal blower" out of hard wood, and also comfort Lily, whose due date is obviously not far away. Ya.

That was a rather embarrassing question, Rurik calculated it, and he could judge that Lilia's due date was in mid-August.

He quietly informed Lilia of his inference, and it was the girl who was extremely shy in return.

Lilia even pushed Rurik hard, and then hurriedly apologized.

"How can you predict the day when a woman will give birth?" She tried to calm her down and returned Liu Likra back to her side.

"I hope my prediction is correct, and you and your children will be safe."

The most important day of a woman is just around the corner, and Lilia is looking forward to the birth of a new life, and she is very terrified and dystocia. She often prayed silently to the Freya goddess enshrined in her home, in order to obtain the promise of peace.

Now Rurik was sitting next to him.

She grabbed Rurik's hand, her eyes full of prayers: "I will be safe, right! The **** of the Ross people will make me safe, right!"

Rurik was a little surprised by the sudden situation, so he comforted: "Yes. God will keep you at peace. Odin, Thor, and Freya are all blessing us. During the summer solstice, I prayed on the altar. Now, hehe..."

"why are you laughing."

"Look, we are following Thor's guidance to build a great furnace destined to succeed."

Since they are generally superstitious, why don't they just use it?

Perhaps only the complete success of the blast furnace can make Lilia completely put her fear aside, only her infinite enthusiasm for new life.

The waiting room of Cravason's house has become a wood workshop.

Even if he has a lot of silver coins, but there are no useful consumer goods, he is more willing to bury the silver coins underground. He is still a blacksmith, because it was the task that Lulik confided that the blacksmithing work was completely suspended, and all the orders for steel swords from the tribe on hand were delayed.

Sitting on the ground, he is working hard to make a centrifugal blower nearly half a meter high.

The key to this blower lies in its bearings and the impeller attached to the pump.

Even if there is no ball bearing system, even roller bearings do not exist, it does not mean that Kravassen can not make bearings.

The blacksmith's two-wheeled trolley, it has the hard-touch draw made of bronze. Although this kind of hard contact has very poor resistance to wear, as long as a large amount of seal grease is applied to the bearing gap, there is no need to worry about its use.

Clavasson is using the traditional tenon-and-mortise structure to piece together the frame of the blower, and it doesn't take long to just make it.

Of course, the most important thing is to install wooden blades on the manufactured bearings.

There are as many as six blades, which are installed at an angle relatively close to 60 on a wooden shaft with tenon and tenon. For its stability, Clavasson also smeared some turpentine in the gap.

Each blade is not simply a flat and straight plate arranged obliquely, they are all chiseled, so that it has a certain curved surface.

Rurik understands that only curved impellers can achieve the best working condition.

And seeing the huge impeller close to forty centimeters randomly placed on the ground, what Rurik suddenly thought of was not a blower.

"Ah! This... is it a standard propeller if you press it on the boat?"

The huge impeller is installed in the preset bearing hole filled with seal oil, and Clavasson never forgets to face the watching Rurik to show off his masterpiece.

He applied force with both hands and the entire impeller steadily revolved.

"Look! It's like a rolling wheel, oh, only the best craftsman like me can make it spin stably."

Rurik shrugged his shoulders with a smile, and listened to the old guy's self-proclaimed boasting here.

The rotation of the impeller is indeed quite stable. Lurik is still very worried about the wear resistance of the bronze bearing in direct contact, and the entire impeller is quite heavy. To make it work well, I am afraid that the effect of only strong man's manpower is really true. Okay?

The biggest advantage of the centrifugal blower is that as long as it keeps rotating, the wind will continuously enter the furnace. This is a technical advantage that other types of blowers cannot achieve. The key is how to keep the impeller rotating, perhaps using a watermill or a windmill to drive it, is a promising development direction.

Rurik didn't want to take a step too far. Since there are many young people in the tribe, they never want to let go of any opportunities to make money. At this stage, they can hire these cheap labor.

The entire blower was placed on a huge wooden board, and eight feet were nailed to the bottom of the board for stability.

The huge impeller is surrounded by a larger wooden bellows, which is nailed to death by a large number of wooden boards, and the gaps are sealed with rosin. It is a wooden centrifugal blower designed by Rurik according to his own cognition, resembling a huge snail shell. One side of the impeller is left with a large area of hole, which is the air inlet. A long bearing protruded from both sides, and the bearing outside the blower was covered with two wooden plates that tended to be round.

The wooden disc has been chiseled and proudly accommodates the drive belt.

At the back of the wooden board that carries the blower, there are two thick uprights that support another bearing system. The most striking thing is naturally two wooden boards that are nearly one meter in length and tend to be round.

At the outer edge of this bearing, there are two large handles.

In a sense, its structure resembles a spinning bike. It is not a fitness equipment, but it has a fitness function.

Two pieces of deer skins cut into strips are tied into a belt and tightly fitted into the grooves in the wooden pan.

The rear wooden disc has a stika in diameter, which is close to one meter, but the wooden disc on the outer edge of the blower impeller is only a quarter of the stika.

The rear wooden disc rotates once, and the blower impeller can rotate four times.

On the sixth day, although the transport ship that transported the chrome ore hadn't returned, the blower that Rurik was eager for, was stunned by Cravason's masterful hands.

It stands like a sacred object in the waiting room, so that the wood chips are everywhere on the wooden boards, and the various processing tools are no longer annoying.

The impeller is huge, and the air outlet is only as big as a fist clenched by a man. It is designed to align well with the air inlet of the stove. Similarly, deliberately made narrow air outlets, even for the entire blower to maximize air compression. Its essence is exactly a turbocharger.

It's finally time to test its strength!

Rurik sat cross-legged on the air outlet of the blower with his arms folded. In front of him were the Clavassen father and his son holding the long-handled handle of the rear bearing, and Kamnier and all the other blacksmith apprentices watching the grand event.

"Start?" Cravason asked.

"let's start!"

Following Rurik's order, the proud blacksmiths and father and son waved their arms almost as thick as thighs, gritted their teeth and began to turn the huge machine.

It can be said that this thing is the most complicated machine they have built so far in their life, and it actually has two bearing systems!

Because the bearing system used is too backward, the torque force of it is somewhat large, and indeed only a strong man can drive it well. Fortunately, as long as it rotates, the inertia dictates that the operator does not need to continue struggling to output.

Driven by the belt, the impeller is clearly earning faster and faster. Lurik's face is facing the air outlet, and the wind he feels is also increasing rapidly.

Finally, he had to close his eyes and crawl away.

"Kawei, stop!" Clavasson yelled, and hurriedly asked Rurik, who was covering his eyes: "My little master, are you all right."

"I...I'm okay~www.mtlnovel.com~ Rubbing his eyes vigorously, Rurik sits upright, smiling and can't help but thumbs up: "The wind is so strong!" Clavasson, we made it! "

"Oh, it is my pleasure to be satisfied with you."

"You are doing well! I can be sure that it is hundreds of times stronger than the bladder blower it used in the past! Its wind makes me unable to open my eyes, and it is even more fierce than the strongest north wind in winter!" The rhetoric here is indeed a bit exaggerated, but the strong wind and stable air supply brought by this blower are entirely high-tech machinery owned by the Ross tribe.

"Clavason!"

"in!"

"I've decided. You must make three more before the ore arrives!"

"Huh? So many?!"

"I know it is time-consuming, but our furnace must have the best blower. The furnace must have one of the four air inlets!"

Clavasson nodded reluctantly: "Well, I will."