Li Xiu saw Qi Niang's eyes red, as if he had cried before, which made him think that Qi Niang had suffered some grievances, but when he entered Qi Niang's study, he was startled, only to see that the study was in a mess, the key was that the ground was full of torn papers.

Seeing these scraps of paper on the ground, Li Xiu couldn't help but bend down to pick up one, and found that these were all ship shapes designed by Qi Niang, which made him stare at Qi Niang with wide eyes and said, "Qi Niang, what are you doing, aren't these all your hard work?" ”

Qi Niang is obsessed with shipbuilding, and naturally attaches great importance to the ship type drawings of these designs, last time Li Jin took her drawings without authorization, and was forbidden by her to approach her yard, usually the maids around her did not dare to touch her drawings, but now she actually tore up the drawings, which made Li Xiu also a little unbelievable.

Qi Niang originally wanted to hide it from Li Xiu, but now that she saw that she couldn't hide it anymore, she couldn't help but show a weak expression and whispered: "The reason why I wanted to build a ship at the beginning was to build the fastest and safest ship, so that the connection between the Americas and the Central Plains could be closer, instead of only one trip a year like now, but now I find that no matter how I design, the navigation of the ship will be subject to all kinds of restrictions, even if the speed is improved, but it can't change the overall situation!" ”

At the end, Qi Niang's tears couldn't help but gush out, she has always been very confident in herself, thinking that she is extremely smart, and the problem that others can't solve doesn't mean that she can't solve it, but over the years, with her in-depth study of shipbuilding, she found that her ship design has entered a dead end, especially in terms of speed, no matter how much she improves, but she can't let people cross the ocean in a short time.

It is precisely for the above reasons, so Qi Niang has also become very irritable during this time, but she usually does not show it in front of her family, only when designing drawings, she will become sensitive and irritable, which is also one of the reasons why she does not let others disturb, because she is afraid that she will not be able to control her temper, and today it is because of a small mistake, which completely aroused the anger and unwillingness in her heart, which is what she is now.

Li Xiu couldn't help but sigh secretly when he heard this, it turned out that the reason why Qi Niang became so irritable was still Li Chengdao, speaking of which, since the last time she saw Li Chengdao, the whole person has become no longer as lively as before, and the time spent on shipbuilding has been longer.

Li Xiu also saw this change in Qi Niang's body, but there was no way, because these signs showed that Qi Niang and Li Chengdao's last meeting made the relationship between the two of them closer, so Qi Niang was in a hurry to build the fastest boat, so that she could meet Li Chengdao, but because of the delay in progress, today's incident happened.

"Qi Niang, shipbuilding is a very systematic project, and it can't 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 any more time!" Qi Niang couldn't listen to any words of comfort at all, and in the end, she hugged her head and cried, after all, she was just a girl, and she couldn't bear such a lot of pressure, especially now that she doubted whether she had taken the wrong path from the beginning, and shipbuilding couldn't solve her own problems at all.

Seeing Qi Niang crying bitterly, Li Xiu was startled at first, and then immediately stepped forward and gently hugged her and comforted: "Qi Niang, don't cry, isn't it just shipbuilding, if you can't think of it, I'll help you think about it, 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, and she didn't have time to wipe the tears on her face.

"Of course it's true, when did Big Brother lie to you?" Li Xiu nodded with great certainty and reassured.

"That's great, big brother, teach me how to solve the current problem!" Qi Niang saw that Li Xiu didn't seem to be joking, and shouted very excitedly at the moment, wiping the tears on her face with her hands indiscriminately, but she forgot that there were a lot of ink stains on her hands when she tore the drawings before, and then she suddenly wiped her face into a big 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 most now is the problem of limited speed increase of the ship?" ”

"Yes, when I first started shipbuilding, I found that the center of gravity of Datang's sea ships was high, and the layout of sails and ship types was unreasonable, which caused the safety of sea ships to be low, the speed was slow, and the load was limited, and I have designed many new sea ships over the years, and many other problems have been solved, but only the speed of the ship has been improved, even if it is the fastest ship I designed, it takes a month to reach the Americas at full speed, but the situation at sea is complicated, and it is impossible to maintain full speed at all times, so the time to reach the Americas will only be later." When Qi Niang said the end, she also had a frustrated expression on her face.

"It's not surprising, although I don't know much about shipbuilding, but I also know that the power of sea ships now comes from the sails, and the sails are driven by the sea breeze, but the area of the sails is limited, so the wind power that can be used is naturally limited, and when the sea ships are sailing, they are also subject to the resistance of water and air, and only when the wind is greater than the resistance, the ship can sail forward." Li Xiu said slowly at this time.

"Actually, there are some discrepancies, but in theory they are!" Qi Niang studied physics with Li Xiu, so she naturally understands these, of course, what Li Xiu said is not entirely accurate, for example, there is another important factor in ship navigation, that is, ocean currents, but now is not the time to dwell on these.

"Very good, the power of the sea boat mainly comes from the wind, although the speed of the wind is very fast, theoretically speaking, if we can reduce the drag to zero, then we can let the boat reach the wind speed, of course this is only the ideal state, but we can increase the speed of the boat from this idea, that is, reduce the resistance of the boat!" Li Xiu finally said his first thought at this time.

"Reducing the resistance of the boat is indeed a way, but I have been doing it before, such as making the hull narrow and long, the bow is sharper, and even the craftsmanship on the outside of the hull is strictly required to reduce the friction of the hull as much as possible, but although the effect of this is there, it is still not possible to greatly increase the speed of the ship." Qi Niang thought that Li Xiu would have some kind of high opinion, but in the end, she put forward the idea of reducing the resistance of the boat, which made her very disappointed.

"That's stupid!" Li Xiu said half-seriously and half-jokingly at this time, and reached out to touch Qi Niang's head as he spoke, saying that since Qi Niang grew up, he had not done such an intimate action to Qi Niang for a long time.

"You're stupid, I'm so much better at math than you are now!" Qi Niang rubbed her white head a little unconvinced at this time, she was a very conceited woman, and naturally she hated others saying she was stupid.

"Haha, look at me to draw something for you, and you'll know how stupid you are later!" Li Xiu laughed out loud at this time, and then came to Qi Niang's desk, and then picked up the charcoal next to him to prepare to draw, Qi Niang was influenced by Li Xiu, whether it was painting or designing, he preferred to use charcoal, charcoal is not only convenient, but also the lines drawn are thinner and clearer.

I saw that Li Xiu first drew a long and narrow hull on paper, which seemed to be no different from an ordinary ship, but then he drew an identical hull next to it, and then drew a connecting deck on top of the two hulls, as if two small boats were put together into a larger ship.

"This ...... What kind of strange ship is this? Qi Niang saw Li Xiu's strange boat, and couldn't help but be very surprised, in order to absorb the strengths of a hundred schools, she was not only familiar with the ships of the Tang Dynasty, but also had a deep understanding of the ships of Hu merchants from all over the world, but Li Xiu's ship was the first time she had seen it, and she had never even heard of it before.

"This is called a catamaran, as the name suggests, that is, there are two narrow hulls underneath, which can reduce the resistance of the boat, so as to increase the speed of the ship, of course, there must be only two hulls, three hulls are also fine, and it is said to be faster!" Li Xiu explained with a smile at this time.

Even if there are various power boats in later generations, but the double sailing ship or trimaran is also very popular in later generations, and there are even special events, this kind of boat reduces the resistance of the boat, and the wind and wave resistance is good, it is said that the speed of the fastest trimaran can exceed 90 kilometers per hour, faster than the average car, of course, the technology and materials of later generations are not comparable now, but even so, the catamaran or trimaran can still greatly improve the speed of existing ships.

"Does this catamaran or trimaran really work?" Although Qi Niang felt that this multihull seemed to make sense in theory, it was the first time she had seen such a strange ship after all, so she was still a little skeptical instinctively.

"Of course it works, don't forget, I was the first to come up with the watertight compartment you used for shipbuilding, and now it's not a piece of cake for me to come up with a multihull solution?" Li Xiu said angrily at this time, these have been verified by later generations, and he is naturally very confident.

"Well, I'll hurry up and optimize this multihull in the next few days, design the drawings, and then let the shipbuilding workshop start building a multihull right away, and see how it works!" Qi Niang saw that Li Xiu was so confident, and finally made a decision at the moment, in fact, she already believed in Li Xiu at this time, after all, for Li Xiu's ability, sometimes even she, who is a sister, is amazed.

"Hehe, in fact, multihulls are my first solution, I have another solution here, which can also greatly increase the speed of the boat!" Li Xiu suddenly smiled again at this time.

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