Li Xiu saw Qi Niang's eyes red, as if she had cried before, which made him think Qi Niang was wronged. However, when he entered Qi Niang's study, he was shocked and saw that the study was in a mess, but the key was that the ground was full of torn paper.

Seeing these shredded paper on the ground, Li Xiu couldn't help but bend down to pick up one, but found that all of them were ships designed by Qi Niang. This made him stare at Qi Niang and said, "Qi Niang, what are you doing? Aren't these all your efforts?"

Qi Niang is obsessed with shipbuilding, so she naturally attaches great importance to these designed ship drawings. Last time, Li Jin took her drawings without authorization, but she was forbidden to approach her yard. Usually, the maids around her dare not touch her drawings, but now she actually tore all the drawings, which made Li Xiu feel a little unbelievable.

Qi Niang originally wanted to hide it from Li Xiu, but now she saw that she couldn't hide it anymore, and she couldn't help but show a weak expression and whispered: "The reason why I wanted to build a ship was to build the fastest and safest ship, so that the connection between America and the Central Plains could be closer, rather than only once a year like now. But now I find that no matter how I design it, the navigation of the ship will be subject to various restrictions. Even if the speed is improved, it cannot change the overall situation!"

At the end of the day, Qi Niang couldn't help but burst into tears. She had always been very confident in herself and believed that the problem that she was extremely smart and could not be solved by others did not mean that she could not solve it. However, with her in-depth research on shipbuilding over the years, she found that her ship design had entered a dead end, especially in terms of speed. No matter how much she improved, it could not allow people to cross the ocean in a short period of time.

It is precisely because of the above reasons that Qi Niang has become very irritable during this period, but she does not show it in front of her family. She only becomes sensitive and irritable when designing drawings. This is also one of the reasons why she does not let others disturb her, because she is afraid that she can't control her temper. Today, it was a small mistake that completely aroused the anger and unwillingness in her heart, which is why the current scene is here.

Li Xiu couldn't help but sigh when he heard this. It turned out that the reason why Qi Niang became so irritable was Li Chengdao. Speaking of which, since she met Li Chengdao last time, she has become less lively than before, and she has spent a longer time on the shipbuilding.

Li Xiu also saw this change in Qi Niang, but there was no way, because these signs showed that the last meeting between Qi Niang and Li Chengdao made the relationship between them closer, so Qi Niang was eager to build the fastest ship so that she could meet Li Chengdao. However, because there was no progress, what happened today.

"Qianniang, shipbuilding is a very systematic project, and it cannot be improved overnight, so don't be too discouraged!" Li Xiu could only comfort him like this at this time.

"But I can't wait, I don't want to waste time like this anymore!" Qi Niang couldn't listen to any words of comfort, and at the end she even hugged her head and cried. After all, she was just a girl and could not bear such a lot of pressure. Especially now she doubted whether she had taken the wrong path from the beginning and that building a ship could not solve her problems at all.

Seeing Qi Niang crying bitterly, Li Xiu was shocked at first, and then immediately stepped forward and hugged her gently and comforted her: "Qi Niang, don't cry, isn't it just a shipbuilding? You can't think of it and I'll help you. I have a way to solve your current problem!"

"Really?" Qi Niang couldn't help but raise her head and sobbed when she heard Li Xiu's words, without even having time to wipe the tears on her face.

"Of course it's true. When did the brother fool you?" Li Xiu nodded with certainty and assured.

"That's great. Brother, please teach me how to solve the current problem!" Qi Niang shouted excitedly when she saw that Li Xiu was not joking. She said that she wiped the tears on her face with her hands, but she forgot that there were a lot of ink marks on her hands when she teared the drawings before, and then she wiped her face into a big blurred face.

Seeing Qi Niang's appearance, Li Xiu couldn't help but smile helplessly, picked up the handkerchief next to her and wiped her face, and then said seriously: "Qi Niang, what you want to solve the most now is the problem of limited speed increase in the ship?"

"Yes, when I first started building a ship, I found that the Tang Dynasty's sea ships had a high center of gravity, and the layout of the sailing and ship shapes were unreasonable, which led to the low safety, slow speed and limited load capacity. In recent years, I have designed many new sea ships, and other problems have been solved many, but the speed of the ship was limited. Even the fastest ship I designed, it would take a month to sail at full speed. However, the situation at sea was complicated and it was impossible to maintain full speed at all times, so it would only be later to reach the Americas." Qi Niang said at the end, her face also showed a frustrated expression.

"This is not surprising. Although I don't know much about shipbuilding, I also know that the power of sea boats now comes from sails. The sails are driven by sea breeze, but the area of ​​sails is limited, so the wind power that can be used is naturally limited. When sailing, sea boats also have to be dragged by water and air. Only when the wind is greater than the resistance can the ship sail forward." Li Xiu said slowly at this time.

"In fact, although there are some differences, it is true in theory!" Qi Niang studied physics with Li Xiu, so she naturally understood this. Of course, what Li Xiu said was not completely accurate. For example, there is another important factor in sailing on a ship, that is, ocean currents, but now it is not the time to worry about these things.

"Very good. The power of a sea boat mainly comes from wind power. Although the wind speed is very fast, theoretically speaking, if we can reduce the resistance to zero, we can make the ship reach wind speed. Of course, this is just an ideal state, but we can increase the speed of the ship from this idea, that is, reduce the resistance of the ship!" Li Xiu finally expressed his first idea at this time.

"Reducing the resistance of the boat is indeed a way, but I have already done it before, such as making the hull long and narrow, the bow is sharper, and even the process outside the hull is strictly required to minimize the friction of the hull as much as possible. However, although this effect is available, it is still not enough to significantly increase the speed of the boat." Qi Niang thought Li Xiu would have some ideas, but in the end she proposed the idea of ​​reducing the resistance of the boat, which made her feel very disappointed.

"That's because you're stupid!" Li Xiu said half-seriously and half-jokingly. As he said that, he also reached out to point Qi Niang's forehead. Speaking of which, since Qi Niang grew up, he had not done such a close move to Qi Niang for a long time.

"You are stupid. My math is much better than you now!" Qi Niang rubbed her fair forehead with some dissatisfaction. She was a very conceited woman, so she naturally hated others to say that she was stupid the most.

"Haha, let me draw something for you. You will know how stupid you are later!" Li Xiu laughed loudly at this time, then went to Qi Niang's desk, and then picked up the charcoal pen next to him to prepare to draw a picture. Influenced by Li Xiu, Qi Niang prefers to use charcoal pens whether in painting or design. The charcoal pens are not only convenient, but also the lines drawn are thinner and clearer.

Li Xiu first drew a narrow hull on the paper, which seemed to be no different from an ordinary ship, but then he drew a exactly the same hull next to it, and then drew a connected deck on the two hulls, as if he had put two small boats into a larger ship.

"This... what kind of strange ship is this?" Qi Niang couldn't help but say in surprise when she saw the strange-shaped ship written by Li Xiu. In order to absorb the strengths of the hundreds of schools, she not only familiar with the ships of the Tang Dynasty, but also had deep insights into the ships of Hu merchants from all over the country. However, this was the first time Li Xiu's ship written by him, and she had never even heard of it before.

"This is called a catamaran, and it is called a ship. It means that there are two narrow hulls below, which can reduce the resistance of the boat and increase the speed of the boat. Of course, there must be only two hulls, three hulls are fine, and it is said that the speed is faster!" Li Xiu explained with a smile at this time.

Even if there were various power ships in later generations, double-seater sailing ships or trimaran sailing ships were very popular in later generations, and there were even special events. This kind of ship reduces the resistance of the ship and has good wind and wave resistance. It is said that the fastest trimaran sailing ship can speed more than 90 kilometers per hour, which is faster than ordinary cars. When the craftsmanship and materials in the next generation are not comparable now, but even so, catamarans or trimarans can still greatly increase the speed of existing ships.

"Is this catamaran or trimaran really effective?" Although Qi Niang felt that this multi-hull seemed to make sense in theory, it was the first time she had seen such a strange ship, so she was still instinctively suspicious.

"Of course it works. Don't forget that the watertight cabin you used to build ships was the first to propose. Now it's not a piece of cake for me to come up with a multi-hull method?" Li Xiu said angrily at this time. These were all verified by later generations, so he was naturally very confident.

"Okay, I'll take the time to optimize this multi-hull in the past few days, design drawings, and then let the shipbuilding workshop start construction to build a multi-hull to see how the effect is!" Qi Niang saw that Li Xiu was so confident, and finally decided to say that she had believed in Li Xiu at this time. After all, sometimes even her sister-in-law was amazed by Li Xiu's ability.
Chapter completed!