It took seven days for all three parts of the wheel to be made, and Su Yan assembled the wheel by himself, and in less than an hour, both wheels were assembled.

It should be noted that no nails were used in the manufacture of these two wheels, and the two wheels were able to maintain the structure firmly by the concave and convex fits between the individual structures.

Put the two assembled wheels together, these two wheels are made according to the graphics drawn by Su Yan, and the size of the wheels should be the same, but when you compare them together, you can see that the two wheels have a lot of differences, these two wheels are inferior products, they can barely be used as wheels, and the speed of damage is faster than that of qualified products.

The skills of the two carpenters are still a little worse, and there is also the reason for making wheels for the first time, and when they are proficient in the technology of making wheels, they can make wheels of qualified products or wheels of better quality, and the specifications of the wheels will not differ too much.

Now that the wheels are ready, it's time to make the frame of the car, although two wheels are made, Su Yan has no idea of making a two-wheeled car.

Two-wheeled vehicles can be pushed and pulled by people, but they are more suitable for cattle and horses, the dragon tribe does not have cattle and horses, and there is no need to make two-wheeled vehicles for the time being, and the specifications of the two wheels are slightly different, a car uses these two wheels with slightly different specifications, which will only make the wheels damage faster.

The idea of making a two-wheeled vehicle was put down, and what Su Yan needed to make was a one-wheeled vehicle, which could also be called a unicycle.

"Unicycle" is a relatively familiar term, there is a saying, "the war of liberation was launched by wheelbarrows", the People's Liberation Army did not have cars to transport supplies, and finally the common people used tens of millions of wheelbarrows to transport supplies to the front line.

Compared to two-wheeled vehicles, unicycles are smaller and can be easily pushed by one person, while two-wheeled wheels are more stable on flat ground, but unicycles are more maneuverable in places with easy unbalance such as small, paved or warped roads, and are easier to control when unloading.

The dragon tribe repaired the road that had been carved out, but it was very difficult to build a smooth road, and it was more suitable to use a unicycle than a two-wheeled vehicle.

The structure of the wheelbarrow is very simple, a wheel in the middle, both sides are the platforms for carrying goods, a brace is connected under the left and right platforms, there are two handles, a wheelbarrow can carry up to two hundred pounds of things, which is much easier than a flat shoulder.

In fact, there are two types of wheelbarrows, one of which has smaller wheels, and above the wheels is a body to carry goods.

The two wheels designed and made by Su Yan are about two feet in diameter, which can only be used to make the first structure of the wheelbarrow, Su Yan drew the structure of the wheelbarrow and threw it to the two carpenters, they can already understand the simple drawings, the structure of the wheelbarrow excluding the wheels is very simple, it takes two days to make it, Su Yan has no need to keep staring, and continues to take people to the jungle to pick herbs.

In the past, Su Yan took the escort team out to pick herbs, but this year, Su Yan brought five newcomers, the snake witch disciple Snake Mu, and the tiger witch disciple Hu Xin.

In the Dragon Tribe, only Su Yan, the five witches and the disciples of the five witches knew how to heal, and in a few years, ordinary diseases and non-serious injuries were treated by them, and only incurable diseases and serious injuries needed Su Yan's help.

As a doctor, it is not enough to just see a doctor and grasp medicine, but also to pick herbs by himself, and in the process of picking herbs, Su Yan will also solve the habits and medicinal effects of herbs for them.

Originally, the five witches should also join it, but Su Yan considered that the snake witch and the tiger witch were very old and the force value was very low, so he was worried that something would happen in the jungle, so Su Yan did not let the five witches participate, but brought out their disciples and practiced it.

With the continuous increase in the total population of the Dragon Tribe, the amount of herbs needed every year is also increasing, and the escort team that has been following Su Yan has learned a lot about collecting herbs.

However, this year, Su Yan went out to collect herbs a lot, and most of the herbs collected were reserved for the use of sick or injured clansmen, and a small part of the precious herbs were used by Su Yan, Xiaohua, and Xiaoyue.

This year, Su Yan is eighteen years old, Xiaohua is nineteen years old, and Xiaoyue is seventeen years old, the bodies of the three have almost developed, and they have also reached the rapid improvement period of the martial arts of the three people.

With the improvement of strength, Su Yan felt that he would be able to try to defeat Biao next year at the latest, as for the vigorous force, it was better to postpone it, the power of the vigorous force was too terrifying, and a punch to Su Yan could directly seriously injure him, and the so-called innate divine power was nothing more than this.

Two days later, two wheelbarrows were built.

Su Yan looked at the two simple-looking and rough-looking unicycles parked in front of him, and took a closer look, although the quality and appearance were not good, but these two unicycles were also successfully manufactured, and they could be put into use normally, and they would be improved after the problem was found.

"Here, you two try pushing this wheelbarrow." Su Yan pointed to the two carpenter apprentices and said.

Pushed by two apprentice carpenters, the wheelbarrow was moving, perhaps they had tried to push the wheelbarrow before, and now they were able to operate it very well.

"Tie some wood to the wheelbarrow." Su Yan said again.

This is the place where carpenters do their work, and there is the most wood, and the carpenter and the carpenter apprentice tie some wood to the wheelbarrow together, and there are almost the same number of cargo platforms on both sides of the wheelbarrow, so that when pushing the wheelbarrow, people do not need to spend more effort to control the balance of the wheelbarrow.

After some simple tests, Su Yan determined the practicality of the wheelbarrow.

"You're doing a good job." Su Yan praised the two carpenters and the four carpenter apprentices.

Hearing the king's praise for them, they all grinned, and it was their honor to be praised by the king.

The wheelbarrow has been manufactured, and Su Yan has also verified the practicality of the wheelbarrow, and then the wheelbarrow should be manufactured in large quantities, two carpenters and four apprentices are not enough, and Su Yan transferred two carpenters and four apprentices.

Su Yan estimated that when the carpenter became proficient in making unicycles, he could build a unicycle in five days at most, and the four groups of people worked together to make 24 unicycles in a month.

Feeling that the speed of making a wheelbarrow was still a bit slow, Su Yan mobilized ten men, ten women, and twenty adult clansmen to come over and give the carpenter a hand.

Soon the Dragons will be able to produce wheelbarrows in bulk, transporting fish from the river to their settlements, food from their settlements to copper mines and copper ore back, and many places will be able to use wheelbarrows, provided there are roads that allow them to pass.