Yang Yan nodded and said, "I have a way to solve this problem, that is, dig a dock by the water first."
"Dockyard" Everyone looked at each other.
Yang Yan explained: "The so-called dock is to build a deep pool on the river bank that is closed on three sides and faces the water on one side, and install a gate on the waterfront side, and a set of brackets are placed at the bottom of the pool. ” Jiang Zhao's mouth suddenly opened and couldn't close, this is really a genius idea, although the digging pool is a little troublesome, but the benefits are also obvious, once and for all, and in an almost closed space, the speed of shipbuilding and maintenance can also be accelerated a lot, I can't help but praise: "The general is really a genius, and the old man admires it very much." ” Yang Yan was not modest, and smiled slightly: "The inch is long, the ruler is short, but if you want to make the best use of each other, it will be nothing more than moving your mouth and yourself, if you really want to achieve something, you have to rely on Jiang Gong." ” "Don't dare, don't dare, the general is too modest."
Jiang Zhao was quite comfortable to hear this, and he was humble.
"Hmm" Yang Yan waved his hand, and suddenly noticed that there were shipwrights repairing the ship not far ahead, so he beckoned: "Jiang Gong, let's go and have a look." ” When the group came closer, Jiang Zhao was about to order the boatmen to salute, but Yang Yan stopped him, and looked at it with interest, and several boatmen didn't care, they were busy, and they didn't realize that there was someone behind them.
Judging from the shape, this is supposed to be a ship, the raw cowhide has been stripped of its appearance, the hull has been damaged in many places, and it has been unloaded in some places, and it can be seen from one end of the cabin to the other, apparently preparing to reinstall the planks.
Yang Yan noticed that there was no keel in the hull, and couldn't help but turn his head and ask: "In the method of water warfare that Jiang Gong just said, there is a hard collision, if our ship collides with the enemy ship, how can we ensure that the enemy ship is destroyed and our ship is safe?"
"This" With the precedent of the dock in front of him, Jiang Zhao didn't dare to despise Yang Yan anymore, thought about it, and then said: "Generally speaking, it is necessary to have an experienced helmsman at the helm, and hit the weak parts of the enemy ship with the hard part of our ship. “ Yang Yan picked up a branch on the ground, drew a simple keel structure on the river beach, and said: "This thing is a keel, and when building a ship, you can first build a keel, and then build a hull according to the keel."
Its advantage is that because of the existence of the keel, it can not only strengthen the hull and improve the ability to resist wind and waves, but also disperse the impact force to bear by the whole ship, unless the opponent's ship is huge, it can crash our whole ship into a collision, otherwise the hull is difficult to fall apart, and according to the keel, a relatively closed space is separated in the cabin, let's call it a watertight warehouse, so that even if there is local damage, it is difficult to affect the whole ship, Jiang Gong thought that this method is how" Jiang Zhao looked at it carefully, and the more he looked at it, the more frightened he became, although Yang Yan's painting was very rough, but as a family of sailors, he quickly saw the role of the keel.
In fact, the keel did not appear until the Song Dynasty, and it was with the keel that the ships that sailed into the ocean were built, and it can be said that without the keel, there would be no prosperous foreign trade in the Southern Song Dynasty.
Of course, the keel is not the only one, the role of the compass is no less than the keel, but if you don't go to sea, you won't need the compass for the time being.
The shipwrights who repaired the ship also stood up one after another, and after saluting Yang Yan, they looked at the keel, exchanged their heads and ears, and muttered.
The presence was full of experienced boatmen, and the structure of the keel was not difficult to understand, and gradually a look of shock appeared.
With the keel, the ship is not only unbeatably strong, but also increases the deck area, how did such a genius idea come about?
Jiang Zhao looked at Yang Yan with incredible eyes, the knowledge he gained today subverted his lifelong shipbuilding concept, he never imagined that the ship could be built like this, and at the same time, there was a faint and irrepressible excitement surging in his heart.
Yes, Yang Yan attaches more importance to the navy than he imagined, and he is already fantasizing about the scene of galloping through the rivers and seas on a new warship.
Yang Yan reminded: "Jiang Gong, everyone, please keep the law of shipbuilding strictly secret, and don't let outsiders go." ” "Please rest assured, General" Everyone also knew that the stakes were high, and they were busy responding.
Yang Yan inadvertently swept his eyes and saw a pile of bamboo nails on the ground, so he asked Jiang Zhao: "Do you use bamboo nails to fix the hull of the ship?"
Jiang Zhao Shili said: "What is the general's opinion?"
He touched Yang Yan's temper a little, ignored it, didn't express his opinion, it was to express his approval, once he paid attention to a certain aspect, it meant that there was a problem in this aspect.
Yang Yan nodded and said: "Our army has mined iron ore, and we will replace it with iron nails in the future." ” Jiang Zhao suddenly realized: "The general is high, the old man understands." ” In the next period of time, Yang Yan squatted by the river, on-site guidance to the boatman to make the keel, this thing is not verbal, draw a picture can be made, it requires a lot of practical experience, but also use some mechanical knowledge, although Yang Yan has no hands-on ability, but the boatman has, he also has mechanical knowledge, the calculation of load-bearing, the curvature of the bending depends on him.
For the time being, no one will understand these calculation formulas, but it doesn't matter, just have a result, and follow the results without any problems.
However, the dock can not be excavated for the time being, if Shen Chong goes north next year, then Yishui will be very busy, the secret of the dock will also be leaked, and Yishui is now a dry period, if there is a flash flood next summer, there will be a lot of water who has no bottom, it is necessary to observe the summer water volume on the spot, combined with the dry period of winter and spring, in order to determine the location of the dock from the river bank.
Half a month later, the first keel was built, not too big, according to the size of the keel, the seams were nailed with iron nails, and the rest was built with the keel as the foundation, and Yang Yan did not need to do it himself.
But before Yang Yan was ready to leave, Jiang Zhao said again: "General, although the keel has come out, if you really want to build a ship, I'm afraid it won't be completed in a year or two, after all, fresh wood contains moisture, wood is alive, and it will continue to grow.
If it is used urgently, there is only one method, that is, digging a big pit, piling firewood around it, boiling the wood, and drying it for a month or two to use, but this method is unimaginable in terms of manpower and material resources, and the old man does not recommend the general to use it. “ "This" Yang Yan frowned, this is indeed a problem, in the previous life, there were books that said that fresh wood is not only for shipbuilding, even in the construction of some palaces, pagodas and other large-scale projects need to be dried for a long time, often the court will build a large timber factory, specially used to dry wood.
However, Jiang Zhao reminded him of the boiling, so he asked, "Jiang Gongke has heard of lime."
"Lime" Jiang Zhao said uncertainly: "I heard that it is usually used to decorate the wall, but I have never seen it." ” Yang Yan said: "Near Tancheng, there is a lime mine, I went back and organized people to mine, lime boils when it comes to water, and it can be used to cook wood." “ "Oh, that's such a good thing" Jiang Zhao was overjoyed.
In fact, Yang Yan has long planned to mine lime mines, but has not been able to pull out, quicklime is calcium oxide, adding water will release a lot of heat, so that the water pours and boils, which can be used to cook wood, and react with water to generate calcium hydroxide, that is, cooked ash, blended into lime slurry, lime paste, or lime mortar, etc., used as coating materials and brick and tile binders.
In addition, limestone, salt and ammonia and other raw materials can be used to produce soda ash through multi-step reactions, and then caustic soda can be made by reaction between hydrated lime and soda ash, of course, this needs to be done step by step
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