Transportation.

Place of Origin.

This is a pattern of natural attributes.

In Xiao Yun\'s previous world, for a long time, the distribution of wealth revolved around the origin and transportation.

For example, the rapid development and huge wealth of some coastal cities are often because they are located in places with convenient transportation. They can get raw materials at a lower price and make finished products more cost-effective, so as to bring a better economy, which will make most people relatively rich.

What is relative wealth? Is to do the same job, enjoy the same level of consumption, but earn more than people in other regions!

Traffic is the main theme.

And it will last for a long time.

In the past, people in the Yangtze River Basin were relatively rich, not only because the Yangtze River was rich in products, but also because water transportation was much cheaper than land transportation.

In fact, many people understand this truth in the present world.

But what if you know?

They can\'t solve it!

Cattle and horses are there. It\'s never enough.

Now Xiao Yun\'s bicycle has suddenly changed this transportation pattern.

As long as there is a way, it can be transported.

People are cheaper than horses!

I don\'t want to admit it, but that\'s the truth.

The life of a cow is worth more than human life, which is the same iron law in this world.

As for Xiao Yun\'s idea of making a bicycle and putting it into practice, it is because of the discovery of rubber trees.

This towering tree is not pleasant in the Northern Wei Dynasty, because where they grow, other forest crops will grow badly.

The tree looks tall, but the wood is not very good.

If you make furniture, it will deform.

Even sitting on the floor and making mats will "drop slag" because of the wood.

Very upset.

It\'s even worse to use it to build a house.

It will fall by itself!

But this is the best baby for Xiao Yun!

The use of rubber is not so difficult.

There may be a chance to carry out vulcanization in Xiao\'s workshop in the state of Qin. After all, there is still a chance with that set of brewing equipment.

But here, that\'s impossible.

Therefore, the elasticity, durability, plasticity and other requirements of rubber will be at a very poor level.

But that\'s enough!

The most primitive rubber products are not so complex and do not need so many chemical materials.

Just cut a hole in the tree and let the rubber juice flow out.

It is installed in a fixed container.

Xiao Yun chose a slot cut by himself, a slender one, which was just used to make tires.

When pouring rubber, pour a part first, and then add animal hair to it.

Put it down.

When you get into it, pour it down and put it back.

Layer by layer, let the hair and rubber juice completely blend together.

Then wait until it\'s semi dry.

Then put it under the sun and let its moisture disappear.

Before the water completely disappears, it is pressed.

Let it become more dense and compact.

But after all, it is limited by the process. The rubber made in this way... Falls off!

But so what?

It\'s always much stronger than wood and much stronger than leather!

Although there is no hollow in the middle, it will not be as easy to use as the normal tire in the previous life.

But enough.

That\'s enough!

The people here can endure the bumps and labors, and they can also tolerate less skid resistance.

As long as it has a certain elasticity, alleviates vibration, has a certain wear resistance, prevents too severe bumps, breaks the whole body, adds hair in the middle, and increases toughness, so that it is not so easy to break. It can be used for a period of time, and these are enough.

Completely enough!

The problem of the wheel was solved, but the problem of the wheel hub really made Xiao Yun very difficult.

With the current technology, although he has a way to make metal spokes, the reproducibility is too poor! It took him a long time to make a pair by himself, which is impossible for others.

With the price, I\'m afraid no one can afford it. He can only use it himself.

In addition to adding a toy to yourself, what else can it mean?

So he chose wood.

It was like the wheels of a carriage, but it was slightly finer, and the wheels were thinner, reducing the weight by almost 70%.

But even so, the wheel also looks very heavy.

Then there is the frame.

This frame is really troublesome.

If you use iron... Iron is too expensive! Xiao Yun was able to make a heavy one, with brazing in the middle, which was especially strong.

But it will also become meaningless.

If iron is used and brazed, the cost of this thing is higher than that of a carriage. On the whole, I\'m afraid it\'s not as cheap as a carriage.

What\'s the point?

Therefore, Xiao Yun chose wood, slightly better wood, and iron fixed interface to ensure its firmness and stability.

The most difficult part is the chain.

This almost worried Xiao Yun to death.

If the pedal is directly connected to the wheel, it can be solved.

But in this way, the seat and wheel are too close. If you put it on the front wheel, it\'s like a child tricycle. It doesn\'t make much sense. If you put it on the rear wheel, then... If you sit on it and pedal, you\'re afraid you\'ll overturn.

And because the center of gravity is likely to be behind the support point, it can not carry the goods at all, and there is no way to maintain inertial balance.

The best way is to put people and goods in the middle and the wheels on the front and rear sides.

In this way, it becomes the middle force and the back force rotates.

This requires transmission!

Even in later generations, the most difficult technology on a bicycle is the chain.

It\'s even more so here.

How to make a chain? Parts of the same size can rotate smoothly through small iron bars made of high-quality steel. Each small part is extremely complex.

If he could do this, Xiao Yun would have got out the machine gun cannon!

The technology it needs is indeed a little higher than that of ordinary guns.

However, this matter was still solved here in the Northern Wei Dynasty.

Rubber cannot be turned into a belt without treatment.

But... "Belt", in the most primitive time, was made of leather.

There was a kind of pig in the Northern Wei Dynasty.

Black skin pig.

Especially big.

The meat is delicious. The key is that the pig skin is particularly thick.

Twice as thick as boar skin.

And this kind of leather is particularly tough.

This is also the main raw material of leather armor in the elite troops of the Northern Wei Dynasty.

The leather armor of the Northern Wei Dynasty is light and tough, even better than iron armor in some places.

This is also one of the reasons why the Northern Wei Dynasty was strong.

However, Xiao Yun has some doubts about this black skin native pig.

It is reasonable to say that the natural environment of the world should not derive such strong pigs.

Because if they are put into nature, they have no natural enemies.

The sharp claws and teeth of those jackals, wolves, tigers and leopards can\'t break its fur, and in the face of pigs bigger than themselves... I\'m afraid they will be killed by it before biting its skin.

This kind of black skin native pig is being raised by people here.

It\'s strange, even a little abrupt.

But now is not the time to worry about this.

If you have resources, use them first.

There\'s something to drive.

In terms of transmission shaft, copper parts are actually OK.

Copper casting was not a difficult process in the Northern Wei Dynasty.

Only one or two other metals need to be added to the copper to form an alloy. The firmness and wear resistance are guaranteed. After all, it is belt drive, not chain, and steel is not necessary.

Of course, even if there are grooves on the belt and transmission shaft, like gears, there will still be problems such as tooth disengagement, slip, dislocation and so on.

But... Don\'t care!

Enough!

Xiao Yun really can\'t make this kind of thing so perfect in one step.

Yes, it\'s better than walking.

Therefore, the bicycle in front of him is a work of the golden mean made by Xiao Yun in consideration of replicability, production difficulty, popularization, cost and other factors.