From the appearance, the gears, spokes, chains, cranks, etc., which are more labor-intensive small parts on the tires, are all made of bronze.

Even the wheels are made of bronze.

You know, the whole bike, other places are good to use bronze to build, just these accessories, more troublesome.

It takes a lot of effort to complete it by hand.

In addition, these crafts are not yet the ability of ordinary crude blacksmiths to make them.

Even the tires, from the outside, are decent.

It's just that Zhao Feng knows that the current big man has no so-called rubber at all.

So this tire is really just like it, not made of rubber.

Zhao Feng squatted down, pinched the tire, and found that it was actually wrapped in cowhide on the outside, and there were other fillers inside.

If you don't take it apart and look at it, Zhao Feng can't tell what is filled in with his feel.

Of course, in addition to the incompatibility between the tire and the future generations, the bearing cannot be made into a roller.

The bearing technology of the current carriage is still used, and a small oil pot is hung on the rear frame for lubrication.

After reading the specific details, Zhao Feng knew that this bicycle was more for viewing than riding.

Otherwise it's too extravagant!

After all, the surface of the tire is wrapped in cowhide, even after special planing, it is still not wear-resistant.

In addition, because it is cowhide, the anti-slip effect is not good.

There is also the old problem of the previous bicycle, the brake problem, which has not been solved, and if you want to brake, you still have to rely on your feet to assist.

But that's not the point.

In the future, there will naturally be enthusiasts to slowly make up for the shortcomings, and maybe they will be able to open their minds and come up with relevant technologies that will not be available in later generations.

Zhao Feng returned to the main seat, sat down, and asked directly: "How much time did this bicycle take?" ”

"Besides, what kind of item is wrapped in the cowhide on the outside of the wheel?"

Huang Yueying gave Zhao Feng a blessing: "Return to the general!" ”

"This bicycle was built by the concubine for a total of ten months."

"As for the things wrapped in the cowhide, the main part in the middle is made of two willow pieces of the same thickness to make a part that is set on the outside of the rim."

"Then fill it with a small amount of burlap and stuff."

After Zhao Feng heard this, he groaned.

According to Huang Yueying's practice, it is indeed possible to slightly make some characteristics of tires.

In addition, because it takes too long to polish trivial things such as gears and chains!

A bicycle actually took a year!

However, this is all a small thing, mainly because after the improvement of the bicycle, there is one more transmission mode in the world, that is, the transmission mode of gears and chains.

At present, most of the transmission methods are between gears and gears.

In addition, this gear transmission technology, because Emperor Wu of the Han Dynasty respected Confucianism alone, coupled with the low social status of craftsmen, was basically broken in the people.

That is, the government still controls this level of technology.

Of course, a family like Huang Yueying's family may also have reservations.

Zhao Feng pondered for a long time: "Put this bicycle in the Mo Academy and show it to the Mo students." ”

"There will always be some Mohist students who can be inspired by this and invent good things that we don't expect."

Then he placed the documents from the bottom of the desk, took out a few drawings, and handed them to Xiong Da: "Give the drawings to Huang Yueying." ”

Xiong Da turned his hands into drawings, and then bowed his hand to Zhao Feng: "No!" ”

After speaking, he handed over the drawings to Huang Yueying.

After Huang Yueying took the drawing, she looked at it carefully and said in surprise: "What is the general drawing?" ”

"From the outside, it feels like it should be a catapult, only larger and more complex!"

Then he asked, "Could it be that this is a catapult?" ”

At present, the catapults of the Han Dynasty basically use a simple lever principle.

It's all pulled by a rope in front.

The accuracy of this catapult is a big problem, and it is entirely dependent on the experience of the slinger to control the strength.

In addition, because the strength required is not small, it is generally three or five people to pull together, so it also needs the cooperation of these people, which is very tacit.

Otherwise, precision strikes ......

Of course, there is no such thing as a precision strike at present, as long as you can throw yourself into the inner city, you are an excellent slinger.

The drawings drawn by Zhao Feng are basically from the Song Dynasty, which can be regarded as the pinnacle of catapults.

Most of these catapults are geared and can be used for precision strikes.

Not only can you siege the city, but you can also throw stones directly into the opponent's army when the two armies are facing each other.

Since it is the pinnacle work, there is naturally more than one type of catapult.

A large catapult, more than 50 meters high, more than 20 meters long, and more than 5 meters wide.

A small catapult, more than 20 meters high, more than 5 meters long, and more than 3 meters wide.

In terms of manpower, there are also differences.

The large ones basically cost more than 300 people, and the small ones can be used by only 10 people.

In terms of range, the large one can hit 200 steps, and the small one can hit 50 steps.

However, according to Zhao Feng's memory, the literature said that these data were slightly reduced because they were worried that they would be obtained by the enemy country and cause technical leaks.

The actual data is slightly larger than this data.

In the past, Zhao Feng expressed doubts, but now, Zhao Feng felt that this record should be relatively broken.

You must know that the effective range of an arrow shot by archers is about 50 paces.

What is the use of a catapult if the range of a catapult is only fifty paces?

Even if it's just a small catapult!

Therefore, Zhao Feng estimated that a large catapult should be able to shoot between 300 and 350 steps, and a small catapult should be able to hit between 75 and 100 steps.

Or, the literature records the effective range, while Zhao Feng predicts the maximum range.

Of course, the specific situation can only be known after it is figured out.

Zhao Feng smiled and nodded: "That's right, these are all catapults!" ”

Then he asked, "How long will it take to build the first experimental catapult, according to the drawings?" ”

Huang Yueying pondered for a long time: "According to the drawings, the first large-scale catapult will take about eight months. ”

"A small catapult, it takes three months!"

Zhao Feng frowned and said, "How could it take so long?" ”

Whether it is a large catapult or a small catapult, it is obviously not something that Huang Yueying can complete alone.

So the approximate time that Huang Yueying said is naturally the time when a group of people built together.

It is fundamentally different from the previous bicycle, which was made by Huang Yueying alone.

Huang Yueying gave Zhao Feng a blessing: "There are a lot of places to explore in the first station. ”

"There are a lot of subtleties, and with the ability of a concubine, it may not be able to be manufactured."

"These times are just conservative estimates, maybe it will be longer!"