In the interval between preparing for the competition, Lin Sen also made a special trip back to Zhuangzi, the caravan to go to the Turks was ready, and it was about to leave, so Lin Sen had to go back to cheer up everyone's morale.

In this caravan, in addition to Xi Junmai, who is the private principal, there are several other young people in Zhuangzi, and they are also some older children who are learning quickly in the school.

Lin Sen also wanted to let them exercise more, which could be regarded as applying what they had learned, so that they could grow up as soon as possible, and the Lin family's industry would definitely be more and more in the future, and they still needed a group of smart people to gradually support their stalls.

Their parents are naturally happy to see this, although they know that there will be a certain danger, but they are still grateful to Lin Sen.

In the future, if you have this errand, or simply become the person in charge of a certain property of the Lin family, it will be much easier to find a wife and start a family.

Besides, the dealers who can participate in this caravan are basically good players who can take charge of themselves, and with so many top players, it is no problem to raid and kill one or two grassland tribes, and the force is absolutely strong and terrifying, compared to the people and horses sent by Cheng Yanjin, they are even stronger.

It's a team with those old killers, and there are also people from the royal caravan, with this lineup, if you are determined to do business, it will be a headache for those tribes on the grassland, and there are very few who can threaten their safety, and robbing them is even more self-defeating.

Unless the Turks send a large army, it is not good for them, but the treatment of merchants on the grassland will not be so extreme, so their safety is actually very guaranteed, more just in case.

Naturally, the goods brought over this trip were mainly the worst high-quality liquor and ordinary tea cakes produced in the brewery, but popular luxury goods such as silk and porcelain were also indispensable.

However, there is a big problem in the transportation process, that is, the two-wheeled carriage is diagonally attached to the pack horse in front, and the angle itself is not horizontal and very unstable, and all the pressure is on the pack horse, and with the movement of the pack horse, the whole carriage will inevitably bump and bump.

And whether it is the wine jar, or the bottles and cans of porcelain, they are very afraid of bumps, and if they are touched, they are worthless.

If you want to fix them all, it is also a technical job, and you have to stuff a lot of straw, rags, or something to absorb shock, but also to fill the gaps, and try to keep them close to the car board, which is not guaranteed to be transported one by one, and the loss on the way is too great.

In addition, the two-wheeled carriage can only be pulled by one animal, and this load capacity is really limited, even if each vehicle is loaded as much as possible, it cannot transport too many complete things to go too far.

As a result, the price of things like ceramics in the steppe has remained high, and only those tribal leaders, or Turkic nobles, can afford to use them, and they have become status symbols.

But Lin Sen wants to get a good start, this trip is more transported, he will make more money, and the relative cost is lower.

Seeing that the battle with the Turks is about to start, this caravan may not be able to go back and forth a few times, so it is relatively easy to do business now, and it is better to seize the opportunity to make more money.

When Datang has completely defeated the Turks, it has become Datang's Happy Valley, and there are not too many caravans to do business, and the competitive pressure will be much greater at that time, and it will definitely not be as easy to do as it is now, and naturally it will not be so easy to make money, so we still have to cherish this hard-won opportunity to make money.

In order to transport these things, and more importantly, to be able to transport more goods to the grassland, Lin Sen also took great pains to get a lot of modified carriages out.

He simply abandoned the traditional two-wheeled carriage structure, which has always been dominant in domestic transportation throughout history, and indeed has inherent reasons and advantages.

On the one hand, it is naturally the imprisonment of traditional thinking, which makes people not pay much attention to craftsmen, and smart people are more willing to move closer to the officials.

Another is also because the land area is too large, the road conditions are very complicated, especially in the south to the north, the terrain is still quite undulating, the two-wheeled vehicle has lower requirements for road conditions, and the scope of application is naturally wider, and it seems to be more suitable for long-distance transportation, so no one deliberately thinks about these.

Besides, isn't there river transportation, or even sea transportation as a supplement, and the requirements for the improvement of carriage capacity are not so urgent.

Perhaps there is another reason, if the officials dislike the slow speed of the carriage, they will choose to ride a horse and gallop. When riding in a carriage, there are often guards and relatives on foot to follow, and there is no need for the carriage to run fast, and the speed of the two-wheeled carriage can also meet the demand.

With the combination of so many factors, no one thinks about improving these two wheeled carriages.

But Lin Sen not only wanted it to pull more, but also wanted it to run fast and steady, so the two-wheeled carriage was naturally incompetent. So he simply made a four-wheeled carriage.

The biggest difficulty of the four-wheeled carriage is the steering mechanism similar to the universal joint in front, with this thing, the four-wheeled carriage can turn relatively flexibly.

It will not be like those huge four-wheeled carriages drawn by more than a dozen horses recorded in the history of the Ming and Qing dynasties, which can only rely on animal power and pull it obliquely, which is not called a turn.

For Lin Sen, this thing is naturally not difficult to come up with, and with the only bit of knowledge left, he can figure it out.

What's more, in his previous life, he saw those four-wheeled carriages used for tourists in scenic spots, or simply for couples to take wedding photos, and he was still relatively clear about the structure of these four-wheeled carriages, and made them after a few simple experiments.

Then add the necessary bearings to the key parts, so that this thing can be more light, wear-resistant and durable, whether it is steering or running.

Moreover, some changes have been made in the materials, and the key load-bearing parts have all been selected to be stronger wood, and some of the wood has been simply transformed, so that the whole four-wheeled carriage is lighter at the same time, but has a greater load capacity.

At the same time, the body will become much stronger, and when necessary, it can even be used as a temporary fortress, which can provide an extra layer of security for the bankers.

Compared with the original two-wheeled carriage, the load capacity of the four-wheeled carriage made by Lin Sen has not increased by a little bit, and it can be said that it is not an order of magnitude. If the horses are strong enough, they can even load a ton of cargo and still move forward as usual.

In fact, the reason is very simple, the two-wheeled carriage needs to be carried away, and the four-wheeled carriage only needs to be pulled, which is like the same person carrying something on his back, and dragging the four-wheeled cart to walk, the weight he can drive must be different.

To take an extreme example, the world's Hercules in later generations were even able to drag the 737 plane out of the hangar.

But if you unload the front wheel of the plane and let him try it with the landing gear, let alone drag it away, he won't be able to stand up, and he will be directly crushed into a puddle of meatloaf.

This principle is naturally the same when applied to pack horses.

When such a row of four-wheeled carriages appeared on the Zhuangzi, not only Lin Sen himself was extremely satisfied, but also those villagers were also amazed.

Not to mention that it is fast and stable to walk, this is too good for loading, and it is difficult to make more money on this trip.

And the impact of this thing obviously doesn't stop there.