Chapter 68: Cut Wood into Boats (Please Collect and Recommend)
"Try this new saw. If it doesn't work, we'll modify it."
"Well, okay, I'll try."
Luo Chong picked up a white snow saw from the ground and rubbed his black hands. He took the nearly 70-centimeter-long bow saw. The "工"-shaped wooden frame has a saw blade on one side and a hemp rope on the other. Using the principle of leverage, the tighter the hemp rope is, the straighter the saw blade will be.
The copper saw blade with holes on both ends is hung on the two copper nails of the saw frame, forming a certain tilt angle with the wooden frame. Luo Chong put the saw on the line just drawn on the log and pulled it quickly.
Amid the flying sawdust, a clear thin crack quickly swallowed the ink line and moved quickly along the longitudinal direction of the log.
"Okay, that's it. Make 20 more according to this. Do we have enough copper?" Luo Chong asked after putting down the saw in his hand.
The lame man thought carefully, "Well, that's enough. The saw blade doesn't take much material."
"Then go ahead and do it. Don't be afraid of wasting materials."
The copper materials in the Han tribe have been almost used up. Various tools, weapons, and daily necessities require metal. There are still many places that need copper. At least now the Han tribe doesn't even have a copper pot. After the spring, in addition to spring plowing and salt mining, the copper mine will be mined again.
Speaking of mining, Luo Chong thought of another important thing, a boat, or should it be called a boat.
In ancient times, it was said that a boat with a roof is a boat, and a boat without a roof is a boat. This means that a boat with a roof or a deck is called a boat, and a boat without a roof and a deck, but only a hull, can only be called a boat, and what Luo Chong wants to do is a boat.
After the spring, the Han tribe has too many things to do, but the copper mine must continue to be mined. It takes most of the day to walk upstream along the stream from the Han tribe. If you want to pull the ore back, you need a large number of animals to carry it, which is time-consuming, labor-intensive, and food-consuming.
If you use ox carts to pull, you need to build roads. In this primitive ecological environment, some places cannot even be passed by ox carts, and the speed of ox carts is not much faster, but the load is more than that of pack transport.
But if you load the boat directly from the location of the original tree tribe and go downstream, it is estimated that this half-day journey can be reached in just one hour, and the boat can carry more than the land transport, so the Han tribe must have a small boat.
Because it is a boat to be used in inland rivers, and the main purpose is to carry goods, then this boat should be a square, flat-bottomed boat with slightly tilted ends.
Flat-bottomed boats have shallow drafts and are very suitable for sailing in inland rivers, because you don’t know how deep the water level of each section of the river is. If the water level is very shallow, the pointed or round-bottomed boat will easily hit the bottom.
But if it is made into a flat bottom, even if the river is only more than one meter deep, the boat will be like a wooden basin, still able to float on the water, and will never hit the bottom, and the safety and passability will definitely be much higher.
Considering that the widest part of this section of the river is just over 10 meters, Luo Chong set the boat width to three meters and the length to eight meters, so that the boat's length-to-width ratio reached 2.7, which can achieve a relatively good speed, while also taking into account good lateral stability. For primitive people who have never been in the water, it is more maneuverable.
Generally, the larger the length-to-width ratio of a ship, the thinner and longer the ship, which is what we often call streamlined. According to the theory of fluid mechanics, the resistance to the ship will be smaller, so the larger the ratio of the length-to-width ratio, the faster the speed.
The middle part of the ship's side is three meters wide, the bottom of the ship is two meters wide, and the two ends are 1.8 meters wide, slightly upturned, and the side of the ship is one meter high. Because it is flat-bottomed, it is estimated that the maximum draft depth will not exceed half a meter. It can be said to be a long wooden basin.
Such a boat has a large carrying capacity. If it is only for people, it can carry at least 20 to 30 adults at a time. It can also carry at least two to three tons of ore each time, and can also carry four or five people to operate the boat.
The Han tribe had too few people, and Luo Chong did not have time to put all of them into mining, which was unrealistic, so he had to transport enough at one time, at least to ensure the supply for a period of time.
Now that the Han tribe had bow saws, it was no longer a problem to cut logs and saw planks, and the problem of ship planks could be solved.
The eight-meter-long flat-bottomed boat had two ridges and seven U-shaped keels, one per meter on average. The keel was made of pine wood, and the outer planks were made of the core material of fir wood. The outer layer was used to make longbows, and the inner core material was used to make the planks.
As for the oars, they were not needed, so a copper shovel was used directly, which could be used as an oar, a weapon, or a tool.
Everyone was curious about what the leader had made. Only the people of the Yuanshu tribe had a rough guess. They had seen Luo Chong make a kayak with branches and fish skin before. In principle, it was the same as this flat-bottomed wooden boat, except that it was replaced with a wooden keel and a wooden skin.
It was near dusk again, and Luo Chong was directing everyone to work. Feather, who was standing on the wall on guard, shouted.
"Chief, more than 20 people have come to the small river in the east. They look like people from the Black Rat Tribe. They are coming towards us."
"Oh?"
Luo Chong was stunned and quickly climbed up the wall. From a distance, he saw Shu Da leading ten adults and ten boys coming towards this side. He was a little surprised. They came to trade again so soon, and they were all boys. Aren't there only about 150 people in the Black Rat Tribe? How could they take out so many boys who are about to become adults?
The 13 people who had traded from the Black Rat Tribe before heard Yu Mao's call and thought that the Black Rat Tribe came to trade pottery again. They hurried over to look and see if there were any of their relatives who were traded this time.
The ten Li Tribe teenagers following Shu Da were also confused, with a lot of question marks in their heads.
They knew that they were traded to the Black Rat Tribe by their own leader just to exchange for 5 red stone basins. After all, they also knew the value of the stone basins and had no complaints about it. Besides, even if they were traded to the Black Rat Tribe, they would still be neighbors with the Li Tribe, and they would still have a chance to see their relatives in the future.
Unexpectedly, they only stayed in the Black Rat Tribe for one night. The next morning, Rat Da left only five relatively strong boys, and the remaining ten weak chickens were taken away again. It was said that they would be exchanged for stone basins. They still didn't understand what was going on.
A few minutes later, Rat Da led people to the gate. He first looked up at the wall that seemed to have grown taller, and then looked into the wall through the barricades at the gate. He was also shocked and confused.
Looking at the hundreds of large livestock grazing in the wall, the dried pickled meat hanging as densely as a forest, and the hundreds of various animal skins drying in the sun, his eyes almost popped out. If he hadn't seen Luo Chong wearing a golden crown, he almost thought he had taken the wrong road.
"Gulu, this, this, is this the Han tribe? I, I am Rat Da, I am here to trade pottery."
Rat Da swallowed unconsciously and asked in a very unconfident voice.
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(End of this chapter)
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