"The second change is actually linked to the first one." Liu Yifeng picked up the ship model and said: "The hull is elongated and thinned as a whole, canceling a large number of buildings on the ship, and reducing the freeboard of the ship at the same time. ”

This Song Yingxing doesn't understand much, first of all, it is a professional term: freeboard.

"Lord Song, the freeboard refers to the part between the open deck of the ship and the waterline."

"Then why do you want to do away with the construction on the ship and lower the freeboard?"

"Lowering the ship's freeboard and eliminating the structures on the ship improves the stability of the ship and reduces wind resistance."

Because of the presence of Zhang Jun, an expert, he can answer for Song Yingxing at any time, so Liu Yifeng's explanations are relatively direct. But in fact, Zhang Jun also had some difficulty listening, mainly because he was not a shipwright after all, and he was familiar with the relevant knowledge of the hull, and he had just stayed on the ship for many years and was well-informed.

"Finally, there is the third point that I didn't say, because the superstructure has been canceled, and the space on the deck is enough to erect 3 main mast class masts, which is the main reason why the ship's speed exceeds that of Zheng He."

Zhang Jun looked at Liu Yifeng and pointed to the main mast of the Zheng He-class ship model, his Zheng He-class is two-masted, the middle is the tallest main mast, and the front is a small auxiliary mast. In this way, the sails provided by the two masts have already made the speed of the Zheng He-class ship far exceed the three-mast or even four-mast of the Nanyang-class, and I dare not imagine how strong the wind should be if the three masts are all soft cloth sails.

Song Yingxing looked at Zhang Jun again, he didn't understand it halfway, and after seeing Zhang Jun nodding, he asked Liu Yifeng: "What are the shortcomings of this ship?" ”

He knew that there must be advantages and disadvantages in everything, and that this ship would inevitably sacrifice something for speed.

Sure enough, Liu Yifeng nodded and said, "There are quite a lot of shortcomings. ”

"First of all, it will probably be expensive to build because it has a high demand for wood."

The Chinese shipbuilding industry in the era of geographical discovery and the Europa shipbuilding industry had different needs for wood because of their different understanding of the sea.

Except for one Zheng He's voyage to the West, almost all of them were in the near sea, so the demand for timber was low.

After Europa opened up the route from the Atlantic Ocean to the Indian Ocean to the Pacific Ocean, the demand for timber is getting higher and higher, and the timber reserve time of a country is even measured in "ten years". This is why, in the 18th century, when the countries of the European continent were vying for sea power, countries with insufficient colonies withdrew: they did not have a strategic reserve of timber.

When they entered the game again to compete for sea power, the world had entered the era of industrialization, and the sail warships withdrew from the stage of history.

Zhang Jun saw that Song Yingxing obviously didn't understand, and explained: "It's like this, Lord Song, the wood originally used by Zheng He-level and Nanyang-grade was brought out from the old forests in the deep mountains and southeast of the northeast and southwest by the Ministry of War, the Ministry of Household and the Ministry of Industry. After being sent to the shipyard along the coast, it also needs to be professionally processed and dried in the shade for several years to more than ten years before it can be used. ”

Song Yingxing had the support of the Wanli Emperor when he wrote "Tiangong Kaiwu", so he knew that most of the timber used by Zheng He-class and Nanyang-class was pulled from the northeast and southwest with countless manpower and material resources, but he didn't know that it would have to be processed to become the basic wood for shipbuilding. He began to understand why Tobe was staring at the navy's shipbuilding every day, and he was really burning silver tickets.

"However, in recent years, the timber of the Annan Metropolitan Protectorate and the timber of our Dongshan Prefecture have become the main source of shipbuilding, after all, it is close to the sea, and if you can save a little, you can save a little."

The navy also knew how annoying it was in the eyes of the household in charge of finance, so after conquering Nanyang and Dongshan Prefecture, it found that there were also a large number of fine timber suitable for shipbuilding, so it no longer used timber from the deep mountains in the northeast and southwest.

After Zhang Jun finished explaining, he looked at Liu Yifeng: "Why do you say that the ship will have a high demand for wood?" ”

"Because it's in high demand for keels."

So that's the case, Zhang Jun's expression is a little complicated.

The keel can be spliced, but without steel parts before construction, the spliced keel is not as strong as the complete keel structure. However, the demand for timber for the complete keel is too high, which is a great test of the strategic timber reserves and comprehensive shipbuilding capabilities of shipbuilding countries.

Therefore, in this era, there are only the Ming Dynasty and the Franco, who conquered the Americas, and realized that the main battleships are all non-spliced keels. At the same time, in the middle naval powers of England, the Netherlands and Scandinavia, most of the keels were spliced.

The ship proposed by Liu Yifeng is not a warship, and if a complete keel is required, it will indeed be too expensive, and it is estimated that few people will build it, whether it is the court or the people.

Unless it really proves its worth in speed.

Song Yingxing looked at Zhang Jun's complicated face and knew that the first shortcoming was already fatal, but he still hoped to shorten the flight between Dongshan Prefecture and the mainland, so he asked again: "Are there any other shortcomings?" ”

"The living experience of the crew will be very bad, and the Dian Po may be even worse than Zheng He."

Song Yingxing's face immediately turned pale, and he found that he really liked the Nanyang class.

"It doesn't matter, as long as the speed can be thirty percent faster than the Zheng He class, and the cost can be controlled, the navy is still willing to build. Of course, we'll definitely have to verify that the improvements you mentioned are working. ”

Liu Yifeng spread his hands and said that he had no opinion.

It took him more than ten days to travel from Jinshan City to Jinshan City on the Karak sailboat of the king's shopkeeper, while the journey of Zheng He's class at cruising speed only took eight days, which was still considering that Song Yingxing was seasick and did not deploy all the sails, otherwise it could be shortened by at least one day.

After getting off the boat, Song Yingxing breathed a heavy sigh of relief, but when he thought that after the matter of Yushan City was over, he would take Zheng He-level back to Jinshan City, and his expression was extremely gloomy.

Lu Ge got the news in advance and came to pick him up with the officials of the Maritime Safety Bureau who stayed behind.

"Ying Xing, do you want to rest first?"

"Lu Lao, there is no time to rest, I will tidy it up, and after lunch, you will call a meeting of all the officials from the sixth rank and above."

Lu Ge was obviously frightened, he didn't know what was going on, he glanced at Liu Yifeng who was standing beside Yang Changbai, and suddenly found that this person was a little familiar.

The height of Liu Yifeng's 1.8 meters is too conspicuous in this world with an average of 165-170. It's like if you suddenly see a 1.9 meter person in your life circle, how can you leave a little impression.

"Okay, I know, but you still have to rest, how can you have a meeting in your current state?"

Song Yingxing didn't shirk it, he also knew that Lu Ge was telling the truth, nodded and advanced his fur-covered carriage with Lu Ge's support.

(This chapter was from yesterday, and I only realized at noon that I only posted one chapter yesterday)