No matter how unpleasant the trouble is, since people are invited ashore, the night banquet still has to be held.

Han Qian and his father also stayed in the house for the night, and the next day they were appointed to take up the long road to work, so they couldn't delay too long, and left after luncheon.

Han Daoming and Han Daochang were unpredictable and insisted on sending Han Daoxun and his son to Shuiyingwu Port to set sail.

Riding a horse out of the Assassin Mansion, Han Qian stopped on the street, as if there were stones in his boots, he took off his boots according to the corner of the street, and the cuffs of his boots shook down a few times before he put on his boots again and turned over on the horse.

When he boarded the ship, several boatmen pulled up the somewhat tattered sails, and Han Daoxun saw Han Qian take out a wax pill from his arms, and when he rubbed it open, there was a note hidden in it, which saved Han Qian from getting off the street after leaving the boss's assassination mansion, it turned out that someone had hidden this wax pill in the corner of the wall in advance, and made a mark and waited for Han Qian to pick it up.

"When did you arrange someone in Chizhou?" Han Do-hoon asked.

"Menxia Province uses the seal on the official department, so I will let Guo Nuer, Lin Zongjing and other soldiers go west first, and inquire about the customs and customs all the way, and I also hope to find out some interesting things and pass the time for us," Han Qian said, "I just thought that the uncle should not be so easy to let us go, so I specially asked them to keep an eye on Chizhou to see what people will come in and out in the next few days!" ”

"What's so unusual in Chizhou?" Han Daoxun asked curiously.

"Notes on the Use of Space" is compiled by Han Daoxun and Han Qian together, and I also know that Han Qian's principle of using the room is to alternate between light and dark lines. Zhao Wuji, Guo Nuer and others led the Zuo Si scouts to set off first, which was a dark line.

Dark lines lurk in the dark, you need to endure loneliness, and if you don't get critical information, you shouldn't take the initiative to contact them.

"The eldest uncle and the second uncle can still think of using this stupid method to drive a wedge between us and the third prince, but it doesn't mean that there is no ruthless person in the uncle's mansion," Han Qian pouted and asked with a smile, "Daddy is interested in knowing who secretly contacted Zhao Mingting's men and horses last night?" ”

"Alas......" Han Daoxun didn't ask Han Qian what the Zuo Si scouts who had lurked in advance found last night, and when he looked up and saw that the eldest and second on the embankment had already turned back to the city surrounded by everyone, he just sighed lightly and didn't say anything.

Even the elite scouts and secret rooms under the jurisdiction of the Privy Council Staff Division would not be too many, not to mention that Han Qian was in charge of preparing for the establishment of the Secret Cao Zuo Division for less than a month.

Han Qian maximized the available manpower, and there were only forty or fifty people.

After leaving Jinling, the sky is high and the mountains are deep, the mountains are far away and the forests are dense, and the limited manpower of both sides is lurking in the shadows, and it is extremely difficult to find out the clues of the other party; They couldn't even confirm whether Zhao Mingting's side had sent someone to disadvantage him.

Whether it was Han Duan or Han Jun who couldn't stand Han Qian's provocation last night, and went out of the city to contact Zhao Mingting's subordinates, it was not something Han Daoxun wanted to see, but this also proved that Zhao Mingting did send people to his disadvantage.

In addition, the river water swelled, submerging the shallows and silts on both sides, and the boat sailed westward against the south bank of the river.

At this time, the wind direction changed, and the strong wind blew from the southwest, and the old shipwright Ji Fu was familiar with directing the boatmen to adjust the angle of the hull and the sail, so that the hull was folded to the southwest, and the sail formed an acute angle with the wind direction.

This is also the so-called "eight sides by the wind, the wind and walking", Zhao Ting'er, Qingyun and other girls shouted strangely, but they didn't expect to be able to sail against the wind.

Ji Xiyao, the son of Ji Fu, smiled proudly: "This is still an oblique headwind, and in case of a positive headwind, my father can still make the boat go against the grain." ”

Han Qian sat on the deck, tapping lightly on the side of the boat with his bare feet, he didn't think about Han Jun going to see Zhao Mingting's subordinate Ji Kun late at night.

Ji Kun was very vigilant, and after Guo Nuer saw that he had met with Han Jun, he soon lost his whereabouts, but this also confirmed that the Anning Palace did not want his father to go to Xuzhou smoothly.

What Guo Nuer and they can be sure of at present is that there are not many people sent by Zhao Mingting in Chizhou City, and from Chizhou to the east, the Yangtze River is relatively straight, and there are no suspicious ships stranded on the river.

Before Guo Nu'er and the others further grasped the whereabouts of Ji Kun and the others, Han Qian could only sit and watch the changes, he was attracted by other things at this time.

The truth of sailing against the wind seems to be incomprehensible, and Han Qian also knows that the world has mastered the technique of sailing against the wind a long time ago.

He noticed that the hull was moving diagonally against the wind, and even after adjusting the angle of the hull, the wind was pouring in from their diagonal front, and the hull had a noticeable sideways.

This is obviously due to the flattening of the bottom of the boat, which does not counteract most of the lateral forces.

Also due to the constant deviation of the hull, Ji Fu needed to command the shipwright, constantly adjust the sails and rudders, and correct the hull, which naturally wasted some time, but in fact, Han Qian found that the speed of the boat against the wind was not slightly slow.

Doesn't this mean that if you can save some time for side shift correction, the speed of the side against the wind is actually much faster than that of a boat with a tailwind?

This made Han Qian confused, and this was obviously in conflict with some of the dream memories he fused.

How can a side-inclined wind boat be so fast than a downwind boat?

Could it be that when a sailboat moves forward, it's not all the sails that are pushed forward by the wind?

Is the dream knowledge wrong, or is he not deep enough to integrate the dream knowledge?

This is not surprising either.

In the dream, Zhai Xinping is good at finance, literature and history, and his foundation in science and engineering is a little weak.

The sailboats built thousands of years later can reach the fastest speed of thousands of miles a day with the help of the wind, and this time they sailed on the open river, on average, they could only reach the appearance of traveling two hundred miles a day and night, with a speed difference of four or five times, Han Qian knew that this was obviously not something that could be explained by simple mechanical knowledge.

Of course, even if Han Qian didn't know why, he could still come up with a way to greatly increase the speed of the new sailboat.

He couldn't help but think, don't expect to travel thousands of miles a day, if his father can really build a fast sailing ship that travels five or six hundred miles a day in Xuzhou, the journey of the Xuzhou ship to Jinling can be shortened from more than a month to about ten days.

If you find out the situation and travel day and night, the trip will be greatly reduced, and this efficiency will be increased by four or five times at once. From the perspective of trade and transportation, the advantages will be far beyond everyone's imagination.

Although it will take a long time to build a new type of high-speed boat, Han Qian thinks carefully that traditional sailing ships cannot be transformed.

"Are you thinking about the secret room sent by the Anning Palace?" Han Dohoon walked through the cabin, sat down and asked, "Are you going to go ashore in person?" ”

If Guo Nu'er and the others found out the whereabouts of the men and horses sent by Zhao Mingting, Han Qian would naturally go ashore in person to break the situation, but now he was not in a hurry, he had to wait for Guo Nu'er and them to give further signals.

Han Qian shook his head and said, "I'm thinking, even if we don't build a new ship, the ship under our feet can be transformed. Daddy, have you ever noticed that the actual speed of the boat is much higher when it is running against the wind, but it is only because the hull of the ship is constantly pushed sidewinds and moves sideways, and you need to constantly adjust the direction of the boat, and you have been delayed for a lot of time, so it does not appear to be coming? ”

"Hmm!" Han Daoxun has been taken by Han Qian for the past few days, and he has been thinking a lot about the boat he is on, nodding to show that he has also noticed this, and said, "I also feel very confused, why is the speed of the crosswind boat increased so much, he just went to the stern of the boat to find Ji Fu to think about this, and he doesn't know why." ”

Han Qian couldn't figure out the truth of crosswind acceleration, this was obviously not something that the world could figure out, so he forked this and said: "Don't care about the crosswind speeding up, the child is thinking in his heart, if the bottom of the boat is nailed to keep the water plate, when the wind pushes the ship to move sideways, the thick plate is reached by the power of the current, the hull should become more stable, reduce the time to adjust the hull, and the actual speed can become much faster." ”

Han Daoxun thought about it for a while, and also felt that what Han Qian said was quite reasonable, and said with a smile: "After this point arrives in Xuzhou, it can be immediately transformed and verified." ”

"Maybe you don't need to go to Xuzhou to verify it." Han Qian said with a smile.

"How do you verify it?" Han Daoxun's mind is also agile, and as soon as he asked, he also realized that there was a way to verify whether what Han Qian said was feasible, "The root of your idea is to block the water flow from the side to stabilize the hull, we can't turn the boat over now and install a water baffle at the bottom, but we can add plates on both sides of the boat to insert it into the water?" ”

"That's what I thought, too. I called the Ji family's father and son over to see if I could negotiate a way to implement it immediately. Han Qian had already become a man of action, stood up, and called Ji Fu and Ji Xiyao father and son at the stern of the boat through the low cabin that was neck high.

Ji Fu heard Han Qian say the truth, and thought about it for a long time, but his son Ji Xiyao secretly pulled his shirt before he reluctantly said, "...... This seems like a try. ”

Of course, Ji Fu felt in his heart that Han Qian was purely messing around, the craftsmanship passed down from generation to generation, if it could be changed, there would be no shortage of brilliant geniuses among the previous shipbuilders, wouldn't it have changed long ago?

However, Ji Fu knew that his son secretly pulled his shirt to remind him that the young master in front of him was really not easy to mess with, and he wanted to make him toss so much, and there would be no big mistakes, so he reluctantly agreed to give it a try.

The bilge had plenty of materials to repair the sailboat in case it broke down on the way.

In the bow of the ship, Han Qian commanded the people to use two old rudders to splice the thick plate to widen, insert it into the water from both sides of the ship's side and fix it, and toss it to the Xieyang River before it was completed, but at this time, the boat continued to sail against the wind, and the hull was indeed much more stable.

Saving the time for hull side shift correction, Ji Fu, as an experienced shipwright and master craftsman, can accurately estimate the speed of the ship, not to mention improving it by 40%.

"Young Master's idea is really wonderful, Lao Ji didn't expect this method to be so feasible." Ji Fu said with praise in his mouth, he didn't expect to simply insert the two old rudder splicing thick plates into the water, the effect was so obvious, not only the speed was raised, the hull did not shake, the people in the boat were also much more comfortable, and the boatman no longer needed to adjust the hull frequently, and it also saved a lot of effort.

"In addition to being able to kill, I don't seem to be stupid." Han Qian smiled slightly.

Ji Fu and Ji Xiyao's father and son were afraid to answer.

Han Qian looked up at the sky, there was no cloud, a light moon had appeared in the eastern sky, destined to be full of stars and moon tonight, and said to Ji Fu: "You try to sail with the side wind as much as possible, we will not stop at night to see if we can enter the territory of Jiangzhou before tomorrow afternoon." ”

Seeing Ji Fu's inquiry, Han Daoxun also nodded, and asked Ji Fu to do so, he knew Han Qian's thoughts.

They didn't see much suspicious people staring at each side of the river along the way, which meant that Zhao Mingting sent not a lot of people - and could not be very many - and at the same time, they were also in danger of being seen and ambushed again as an enemy.

It is likely that the men and horses sent by Zhao Mingting were roughly estimated according to the speed of their ships, and the time for them to arrive in Jiangzhou, Ezhou, Yuezhou and other places, and then someone watched them at a fixed location.

If they can greatly speed up their movements, it is possible to disrupt the deployment and rhythm of the men sent by Zhao Mingting, and it will cause them to expose more flaws, so that the scouts and spies of the secret Cao Zuosi can catch them, so as to seize the initiative.