"What's so fun?" Zhang Yizhi put down the scroll in his hand and looked at Wu Sangui who rushed back.

Hearing that his father has always wanted to train him to be a civil official, but when he is out of the general's door, seeing that Wu Sangui is in a hurry to do anything, Zhang Yizhi feels that he should not be able to become a civil official, and he will still take the route of a military attaché.

This made him very envious.

is also from a family of eunuchs, but he can no longer embark on a career in office.

"Brother Yizhi, you can go home!"

It's really something to be happy about.

Zhang Yizhi put away the scroll and asked, "Lord Song told you?" ”

"Hmm."

Zhang Yizhi stood up from the chair, and after moving his muscles, he said, "Sangui, can I visit Lord Song, it can be regarded as saying hello." ”

He really wanted to, but at the same time, he was also ready to take advantage of this rare opportunity to meet Song Yingxing in private with him.

It's a pity that Wu Sangui showed an embarrassed expression.

Zhang Yizhi suddenly lamented in his heart: Could it be that Song Yingxing has guarded me to such an extent that he didn't even give him a chance to say hello before leaving?

Song Yingxing has nothing to do with their Jiangling Zhang family, but Wu Sangui is his disciple, and he is a relative of Wu Sangui, so he can barely be regarded as Zhang Yizhi's elder. Of course, Zhang Yizhi's visit can be ruthlessly declined, but in this case, he has also been under house arrest for so many days, and it would be too unsympathetic not to give him a chance to say hello before leaving.

Wu Sangui guessed what he was thinking, and hurriedly explained for his teacher: "Brother Yizhi, it's not what you think, the teacher is no longer in Jinshan City." ”

Not in Jinshan City anymore?

Zhang Yizhi didn't ask about Song Yingxing's whereabouts, he was just a civilian, and he didn't deserve to ask about the whereabouts of a fourth-grade official in the imperial court. But he probably guessed that Song Yingxing should have gone to see the gold mine.

This very logical guess was wrong in the end, Song Yingxing went north to the mountain city. It was Zhang Jun's Zheng He-class that sat on it, and he also brought Liu Yifeng with him.

"What do you think, how can artillery show you?"

Zhang Jun rolled his eyes and complained: "I am now the captain of the Ming Navy, not your partner." Zheng He's artillery is still a military secret, and normally a person like you will be locked in the cabin blindfolded when you get to the Zheng He class, and you can only release it when you dock. Now letting you live on the upper deck is already a big concession. ”

Liu Yifeng could only smile and give up the idea of going into the gun cabin. He wasn't really curious, he wasn't a fan of sail warships, and later generations had seen pictures of various sail warships that left their names in history from the 17th to the 18th centuries.

"How's that, compared to the Nanyang class you've sat in, isn't it much faster?"

It was indeed much faster, after all, Song Yingxing's request was to send him to Jishan City as quickly as possible, so he was in the cabin at this moment with a blue face and endured the pain of seasickness.

"It's okay."

Still...... Okay, right!?

Zhang Jun's mouth was crooked.

"It's the fastest ship in the world, you actually say it's okay!?"

Liu Yifeng is not a dead duck with a hard mouth, he has taken a transition wheel, a speedboat, and the average speed of 7-10 knots of the Zheng He-class is really nothing in his eyes. The average speed of cruise ships in the Yangtze River is around 15 knots, and the number of ferries in the sea is about the same, let alone speedboats.

The technical content of the Zheng He class is equivalent to that of a quasi-Galen ship, and the fastest sailing ship in the era of sail warships is the clipper ship in the second half of the 18th century, which is comparable to the ferries of later generations. Of course, if the life of the hull is not taken into account, the clipper can also maintain a cruising speed of about 20 knots.

Liu Yifeng is now observing Zheng He's thinking about the flying clipping boat, but just like the last time he faced Qiu Qilin at the Fleet Chamber of Commerce, he couldn't remember the specific situation of the flying clipping ship, and he remembered that there was a sail warship in the 18th century with the fastest sailing ship, which could be achieved by the scientific and technological and industrial capabilities of the 17th century.

"Hey, Liu Yifeng, I'll talk to you!"

Liu Yifeng was awakened and looked at Zhang Jun, who was full of muscles: "I'm sorry, I was thinking about a kind of boat just now." ”

Hearing the boat, Zhang Jun's anger that was ignored disappeared in an instant: "What boat?" What kind of ship have you ever seen, the Nanyang class is the largest ship you've ever seen. ”

The largest ship is certainly not counted, and 200,000 tons of tankers understand. However, as far as sailboats are concerned, the Nanyang class is indeed the largest, and the Zheng He class is not as large as the Nanyang class, only about two-thirds of the Nanyang class. As for the Dutch Karak that the king's keeper was in charge of, it was only about two-fifths of the Nanyang class.

"I'm not thinking about the size of the boat, I'm thinking about the speed of the boat."

Zheng He-class is a Western-style soft sail, Nanyang-class is a traditional hard sail, more than 20 years ago, someone had to say that the speed of the hard sailing ship is not as good as the soft sailing, and the Ming Navy was definitely the first to jump out and blow his dog's head. But after a battle of Luzon, the Ming Navy was stimulated by the bed board outside the headquarters, and began to study the Karak sailing ships of the Dutch and Franco, and gradually understood that in terms of speed alone, hard sails can never compare to soft sails under the same conditions.

This point is also conclusive in later history.

In the late Qing Dynasty, a merchant found Britain, which had the strongest shipbuilding capacity at that time, and ordered a hard sailing ship, and the requirement was speed. Later, this Western-style sailing ship with a Chinese hard-sail did run at a speed comparable to that of the mainstream Galen ships at that time, and successfully crossed the Cape of Good Hope from Jiangnan to New York across the Indian Ocean, taking even faster than ordinary Galen ships.

But it's a pity that the fastest sailboat at that time was no longer the Galen boat, but the clipper boat that Liu Yifeng had been recalling but couldn't recall.

At that time, clippers who were mainly engaged in the business of the Americas and Europe, and the Americas and Asia, were on average one-fifth faster than the fastest schooner. And the fastest part of the clipper is even a third faster than it.

This is due to the low conversion rate of hard sails in the open sea to strong winds.

Later generations of experts have analyzed why only parts of East Asia and South Asia have developed hard sails, while the coasts of Central Asia, North Africa and Europe have invariably chosen soft sails. This is because the sea breeze wind speed in the coastal areas of East and South Asia is indeed 20-30% slower than that in the coastal areas of Central Asia, the Mediterranean Rim and the coastal areas of Europe, and hard sails can meet the needs of offshore navigation.

After the demand was satisfied, the early sea ships would naturally not be reeled.

Later, because of the appearance of the Ottomans, the trade with the East was cut off by it, and the Fran machine began to roll in the sea ships, and finally rolled up the Karak sailing ship that could cross the ocean.

East Asia is not as much involved as Europe, and all the needs of the sea are satisfied, so it stops at the schooner.

"Speed? The fastest ship in the world is the Zheng He class. ”

"What if there is still a total soft sailing ship, which is faster than the Zheng He class?"

"Impossible! When pigs fly! ”