"1800 tons! This is the limit that can be done at present, with our current technology, up to 2000 tons of giant ships, but the cost performance is not cost-effective, if the construction of 1800 tons of ships takes about 40,000 yuan, 2000 tons will rise to about 80,000 tons of a ship, this is the cost of construction. This does not take into account the construction time. ”

"A 2,000-ton ship needs 100 more skilled workers, 300 auxiliary workers, and at least two months longer than a 1,800-ton ship." Yu Wenlin gave a general answer.

Li Ke nodded silently, ships are not blindly big, in fact, ships with a displacement of 1800 tons are already giants in this era, absolute giants, and no country can build ships of this scale at present.

"You just need to consider this, cost performance is very important, if you can, you can find a suitable tonnage and start building directly on a large scale." Li Ke nodded and said.

"That's actually a displacement of 1,200 tons is not bad, both in terms of construction time and the cost required." Yu Wenlin said.

"Then we will mainly build 1,200-ton ships." Li Ke decisively gave an order, not to mention 1,800 tons, even 1,200 tons is enough.

Because 1200 tons of Yu Wenlin is talking about the no-load displacement, if it is a modern design, this no-load displacement of the wooden ship does not consider the strength of its own hull material, the load can exceed its own weight, it is estimated that the full load will go to 3000 tons (the author Jun is not a ship designer, only understand the principles of physics, do not bar, the load of modern professional freighters can exceed their own weight, and the volume of the wooden ship with the same displacement and normal design must exceed the steel ship. ）。

But now the ship will certainly not be able to do it, because its volume limits the number of cargoes it can load. But professional warships and cargo ships are definitely different, Yu Wenlin has been exposed to modern shipbuilding knowledge, although he learns very slowly, but he already knows that the arrangement of different cabins of the ship can carry different cargo weights.

"Yes." Yu Wenlin simply agreed.

"How many ships can we build at once at the moment?"

"At present, the number of docks has expanded to thirteen, and thirteen ships can be built at one time, but the number of skilled workers is small, and it still needs to be trained, and it will take at least two to three years to reach maximum production."

"How many apprentices have you trained? Can you keep up with your progress? Li Ke looked at him and asked.

"Actually, there are a lot, my two sons and two nephews can be, they entered Yuelai Trading House to study since they were children, and the mathematics and other cultures they learned were kept up with since childhood, and in terms of ships, they began to learn the knowledge of ship design that Your Highness brought to them last year, they are different from people of the old school like me, they accept the latest affairs from the beginning, so their thinking is even more flexible than mine."

"To tell you the truth, they have inspired me a lot in the latest ship design." Yu Wenlin pointed to his head and said.

"Very good, in this case, you will go with us to Hu (a fishing tool in the Jin Dynasty) (the place where the river enters the sea is called Hu, so Shanghai in the Tang Dynasty is called Hu, and Houhu gradually evolved into Shanghai, now referred to as Shanghai. Shanghai was established in Shanghai by Xianchun in the Southern Song Dynasty in three years), and a large dock shipbuilding base was also established there, and the relevant personnel and equipment have been put in place in advance. Li Ke said.

"This, Your Highness, can't you let the others go? I don't need to build a new dockyard base from scratch, the most important thing in this situation is the ability to organize and dispatch, what I am good at is the ability to study ships, I recommend one person Lutang. It just so happens that he is from the Lu clan of Wu County, and he is currently in charge of the logistics organization here, and he has done a very good job in this regard. Yu Wenlin frowned and said, obviously he didn't want to move.

Li Ke thought for a while, "It's okay, wait until the dock over there is completed, and then you can go over." ”

"Yes. I don't want to stop my own research on ships. Once built, there will be no problems. Yu Wenlin nodded.

"By the way, I also brought a few Langzhong with me this time, and a hundred sets of "Barefoot Doctor's Manual", let that Lu Tang select suitable personnel for them to learn for a while, places where more people gather are prone to epidemics, although it may not be a plague, but it should also be taken seriously." Li Ke said.

"Yes!" Yu Wenlin is not ambiguous in this regard, most people are sick, shipbuilding will stop, he doesn't want shipbuilding to stop.

After building with Yuwenlin here, Li Ke quickly returned to the ship, but this time he went to this Qinwang, and the names of the ships had been written on the side of the ship, Li Ke was a little helpless, to be honest, he really didn't know how to build this ship.

When Li Ke came up, all the personnel of Changle and their personnel had already boarded the ship, the entire Qinwang was 107 meters long, the deck was 14.8 meters wide, the waterline was 3.2 meters deep, the unladen displacement was 1,800 tons, the full load displacement was 2,800 tons, and the full load draft was 4.5 meters. The crew of the entire ship must be 80 people, and the maximum crew can be 600 people.

With a full load of 600 people, the self-sustaining sailing time of the fully loaded materials is about 45 days. To reach this time, it is already a very outstanding design, the fresh water storage device, rainwater collection device, and even the distilled seawater collection device, but the distillation method is emergency.

The most lacking thing in ancient voyages was the problem of fresh water, so most of the ancient ships almost always traveled along the coastline, and even if they crossed the strait, they could not be too long at most.

Of course, the reason why this fully loaded crew is so small is because this ship was designed for Li Ke, and many of the cabins in it dare not be said to be luxurious, but they are stronger than ordinary troop carriers.

For example, a troop carrier with an empty load of 1,200 tons, if it only maintains a self-sustaining voyage of about ten days, it can be designed with a maximum of 1,000 people, and if it is paired with a supply ship, it can cram 1,500 people. Of course, don't expect the conditions to be good, the conditions of modern ships are not very good, let alone ancient.

Besides, in ancient times, they would not stay at sea for a long time, and would dock at intervals to find supplies, especially fresh water resources.

Li Ke and the others will not stay here for too long, and after Li Ke and the others' belongings are transferred to the King of Qin, they will soon leave here.

Early the next morning, the entire fleet was replenished, and with a low trumpet, the fleet left the port again, and this time there were a total of 10 ships, one Qinwang with a displacement of 1,800 tons, 4 other ships with a displacement of 1,200 tons, and the rest were ships of about 800 tons.

However, these boats have been modified with modern sail layouts, not just spinnakers, or rather, spinnakers are just part of the bow.