No one knew how far Su You's thoughts wandered, but they thought he was a little baffled.

But what happened next was different. He and Chen Zhen had a disagreement when discussing the making of the bow. The two began to bet whether a crossbow could be made without elastic bow arms.

This bet was worth five coins, so when the boat was sailing the next day, Su You led a group of people to tinker with it.

In fact, it is still elastic, but the principle of the torsion spring used is something that this kid is bullying and Master Chen doesn't understand.

The elastic force is actually provided by the rope, and the bow arm is a horizontal arm attached to a wooden post.

Loosely tie a few strands of rope to the upper and lower ends of the wooden post, and then rotate the cross arm in the middle, and the rope will be wrapped tighter and tighter up and down the wooden post.

When it is tight enough, once you let go, the two horizontal arms will bounce back in the opposite direction of rotation, which provides energy.

The principle is like this. The two horizontal arms are ready and wound tightly. Two soldiers push the horizontal arms hard. Shi Tong hangs a string made of thick rope on the end of the arm. In the middle is a small copper bowl with a tail.

On the rails, this thing can be used to launch fist-sized stone projectiles.

Next, a section of rope was led backward from both sides of the net bag to make a rope buckle and hung on the tow hook. The two soldiers worked hard to turn the winch at the end of the guide rail, making the bow arm creak backwards and the one-way ratchet click.

Amidst the sound, the rope buckle was slowly pulled by the traction hook to the teeth of the crossbow and hung up.

There are actually several trigger structures for crossbows, not just the pre-Qin style. For example, Su You adopted the patented structure of a later foreign micro-technology company, which makes it easier to trigger.

Similarly, if you want to do it, you should do it in a decent way. Not only does it have a ruler to look up the mountain, but there is also a thin wooden stick protruding from the front of the crossbow. This was an auxiliary aiming tool for recurve bows in later sports competitions.

The current gadget was actually born out of the design of scholars in Greek city-states, and its official name should be the ballista.

It is quite majestic, as tall as an adult, and its two horizontal arms are as long as an adult's arms, and a little thicker.

Then add a base that can rotate horizontally at the bottom, as well as a table and bolts to adjust the elevation and depression angles, and the ballista is complete.

The ballista is installed slightly forward of the middle part of the left string of the ship, which is the most stable position of the hull.

Chen Zhen no longer cares about Bopu's winning or losing, he now only wants to be in the lineup.

Su You carefully measured the safe range and drew the safe range where the crossbow arm could rotate wildly without injuring anyone even if the crossbow string was broken.

Once the string is wound in the future, this area will be a restricted area.

The center of gravity of the ballista is also very delicately designed. There is a counterweight device at the tail. Now it is adjusted so that the overall center of gravity just falls on the base, so that it can be rotated and controlled effortlessly.

Chen Zhen stood behind the crossbow, aimed at a stone on the river beach with high spirits, and pulled the trigger of the crossbow.

There was a loud bang, and some tiny sawdust on the ballista was shaken into the air. The tail of the copper bowl pressed against the guide rail, pushing the stone projectile out with an almost straight trajectory and a speed that was almost invisible to the naked eye.

With a bang, the stone bullet flew high over the boulders on the river beach, and finally hit a target, a cypress tree as thick as a calf on the hillside on the bank.

The juniper tree began to sway slowly, then tilted, fell to one side, and broke into two pieces.

Shi Tong's eyebrows were beaming: "Great equipment! Good accuracy!"

Chen Zhen was dumbfounded: "I aimed at the rocks on the river beach and deliberately raised the angle. Who knows the stone bullets ran almost in a straight line!"

Atunmi had always thought that his younger brother was just messing around, but now he suddenly jumped on the ballista, hitting Chen Zhen with his shoulder and staggering: "Go away, stinky scholar! Don't touch my treasure!"

Su You smiled and said: "Sister, please come back quickly. There are operating risks with the equipment. These are the matters of the soldiers."

Atunmi didn't let go: "Hurry up and load the strings. I'll give it a try too. Hahaha, what am I afraid of now? It's just their little broken boats. I'll destroy every one of them!"

That night, Shi Tong came to Su You and lowered his head and said, "Master, that... ballistae is an important military weapon. Wouldn't it be inappropriate to hand it over to the barbarians?"

Su You smiled and said: "What kind of military weapon is that? When we go back, we will replace the hemp rope with a thick steel spring to ensure that the torque of the two arms is the same. Then expand the shape by twice the width, add an angle scale to the base and pitch angle, and see

Shan was more accurate, calculated the most suitable weight of stone bullets, and even replaced it with lead bullets and javelins. It could be disassembled and dragged by a carriage on weekdays. Finally, a shooting parameter table was made. Only then can it be regarded as a military artifact."

After finishing speaking, he curled his lips and said: "For now, it's just shoddy."

Su You looked down on it, but that didn't mean Atunmi looked down on it. Three days later, three ballistas stood on both sides of the ship, like mighty soldiers.

It was really a treasure, so I sent soldiers to clean it every day and apply tung oil. After that, I had to cover it with a cloth cover, leaving only one place for myself to play with and to train the soldiers.

Su You received five guan of money from Chen Zhen, and spent the past few days pondering over the operating instructions for the ballista in the cabin. The young lady was rather barbaric, and took things too seriously. She would not listen to persuasion, but it turned into a military order. She was very particular about leading by example.

After all, he is a general, so he can only formulate a decree and put it on her.

Nowadays, no camp dares to face the big ship. Atun Chihuo either arranges the camp upstream of the big ship, or arranges it downstream. It also has to support Atunmi with bamboo mats and rattan shields at a relatively far distance.

target.

No one likes to hear a stone bullet flying through the air not far above their head while they are having a barbecue and singing, and then hearing it hit the rock and shatter into pieces with a snap.

With a trembling hand and a frightened heart, the precious cup of Yongchun Dew is gone, okay?!

The barbaric area on the waterway gradually passed, and the river pirates at the junction of barbarism and civilization made Atunmi gnashed his teeth in anger.

This group of water rats seemed to be able to predict danger, and they all hid and made the journey without incident.

Villages, farmers, and buffaloes began to appear on both sides of the river bank, and the clear folk songs of girls and the flutes of shepherd boys appeared.

On this day, the big ship arrived at Dongchuan County, the first big city after entering Dali.

This is a city that is as prosperous as Qingshen County. Chen Zhen feels ashamed of his ignorance. It is not a barbaric place.

When Atunmi came out of the cabin, Chen Zhen was immediately shocked: "You, you, you...how can you wear a left-hand skirt!"

Atunmi was confused, but Mr. Fan couldn't stand it any longer: "Young man, you are really confused. Your Majesty is the beloved daughter of the Great Ghost Master of the Erlin Tribe. He is a general named Zai Li by the imperial court. You must not be rude!"

Chen Zhen stepped aside in despair: "It turns out that the girl is not Han..."

Su You shouted: "Brother Ji Chang, be careful! My sister is from Song Dynasty in Jixi Prefecture of Song Dynasty!"

Atunmi didn't care about this. She didn't think highly of this weird scholar anyway, so she wanted to take Su You into the city to sell things.

Su You is still a little embarrassed, sister, this should be the trade secret of your Erlin Department, right?

Atunmi glared: "How much did you sell our Erlin Department's bronze wares for, and you pretend that we don't know? What are you doing with such a small belly?"

Well, you are a general and everything you say makes sense! You are not even afraid of me?!

The street is a narrow stone road, with wooden plank and blue-tiled buildings on both sides, and pavements along the street. Women dress simply, while men dress fancy. The rich wear colorful silk clothes, with small squares on their sleeves and skirts.

The same broad robe with wide embroidery, just like a butterfly.

They also wear black gauze hats, but the gauze hats are very special. They don’t look like two lotus petals closed together, or they look like a magnolia flower. There is a bud in the middle, and there are four petals that are turned outwards. The petals are also decorated with colorful flowers.

The brocade hooked its edge.

Regardless of whether they are poor or rich, they all have strings of Buddhist beads hanging around their necks or in their hands. Most of them are ordinary tree seed wood beads. In addition to beads and jade, many of the rich wear beads like those hanging around Atunmi's neck.

The zero-eight pieces plus the three-way Buddha head and the wishful knot disciple beads are obviously the most fashionable and trendy accessories.

Atunmi led Su You in front, flanked by warriors from Jingjie on both sides, followed by Shi Tong, Chen Zhen, Mr. Fan, Chaogu and others.
Chapter completed!