Yan Yang arrived at his second sister's house half an hour earlier than Mu Tingxue.

The Qin family gave the eldest princess an invitation to the family dinner in front of the regent, so in order to please the regent, they would definitely invite him as well.

Siblings Yan Yangben and Yan Yun cooked tea together in the pavilion using a clay stove and pine hair, and drank and reminisced about the past.

The eldest princess stood on the veranda on the third floor of Tiangong Building and looked down at the lake and mountains. She didn't see Yan Yang, but Yan Yang saw her with sharp eyes.Yan Yun joked a few words, then hurriedly coaxed her brother away.

As soon as Yan Yang entered Kaitian Tower, he heard Mu Tingxue's sonorous discussion on "agricultural machinery, textile machinery, and hoisting machinery". He was amazed by her erudition and talents, integrating the strengths of hundreds of schools of thought, and her wide range of knowledge. wide.

But when he heard the discussion about "war machinery", a huge heat wave immediately surged in his heart!

As the art of war goes, he who knows it wins, but he who doesn't know it cannot win.Investigation work was extremely important on the eve of a military war. The Zhenbei Army had a reconnaissance mechanical nest car, but there was no "watchtower" as the princess called it. This excited him and aroused a lot of interest.

The exciting mood instantly climbed to the top when the word "Liannu" appeared!

Is there really a long-range weapon in this world that can shoot twenty arrows continuously at one time?

If there is, it will be a great initiative in the military history of the Seven Kingdoms!

So far, the archers in the Zhenbei Army use a weapon called the "God's Arm Bow" - the bow is six feet six inches long, the arrow is two feet long, and the range is 400 meters.To draw the divine arm bow, you need to draw the power of four stones, which can only be controlled by rigorously trained warriors.

The Divine Arm Bow is already considered the best among long-range weapons due to its excellent range, but it can only shoot one arrow.

The shortcomings of one arrow at a time are obvious.

If the enemy is cavalry, the cavalry camp only needs to withstand the first wave of arrow attacks, kill a small group of people, and take advantage of the time difference between Yunhuang's archers to replace their arrows, and use high-mobility, high-speed horses to forcefully rush through. With a range of three to four hundred, the archers on the ground would be immediately hit to death!

Beiyu is a herding nation on the grassland, and they are all cavalry; while Yunhuang is just the opposite, with a farming social structure and infantry as the mainstay.

In order to solve the dilemma of archers being killed by cavalry, Yan Yang specially designed a tactic - let the archers holding divine arm bows be divided into three rows. After the first row finished shooting, they retreated to the back to prepare. The second row followed, and when the third row also fired arrows, the first row of archers who had retreated to the end were ready again.Back and forth cycle.

Once this tactic came out, it did contain the highly mobile Beiyu cavalry to a certain extent.

But it's still not perfect.

It only increased the number of enemy cavalry casualties, and the enemy cavalry could still trample over the corpses of their companions.

"The firing principle of the repeating crossbow is a little complicated."

When Mu Tingxue saw Yan Yang, she didn't ask why you were here.

Don't ask.

As long as he was not fighting outside at the banquet she attended, he would basically be there.

"It doesn't matter if it's complicated. You can talk slowly." The regent looked eager for knowledge.

Mu Tingxue didn't think that she could understand it if she spoke slowly.Due to the limitations of the times, although the child's father had received the best aristocratic education since he was a child, he had never studied physics!

You must know that the firing principle of the repeating crossbow machine is relatively close to that of modern pistols.

But she couldn't bear to dampen her fiancé's enthusiasm, so she took the pen and paper from her fiancé's hand and began to draw the schematic diagram of the crossbow launch: "The crossbow arm in the repeating crossbow is equipped with a crossbow machine, and two crossbows can be placed in the crossbow machine tank. There are ten arrows with a wrench attached to the bow string. If you pull it once, one arrow will be placed in the firing position, and the bow string will be tense and shot out immediately. If you pull it twenty times in succession, you can shoot twenty arrows in a very short time."

Yan Yang leaned over.

The gesture is very intimate, but not close to her arms and body, so as not to hinder her drawing.

Marquis Qin also wanted to take a look at the drawings, but he was a little shy and embarrassed to lean over, so he could only stretch his neck as long as possible, like a duck's neck.

It should have been marked 123456, but Mu Tingxue was afraid that ancient people would not be able to understand it, so he directly replaced the six important components of the crossbow machine with A, B, C, D, and Wu Ji.

She drew a trigger-like device and labeled it A: Hanging Knife.

"What is this hanging knife?"

Yan Yang asked seriously.

Mu Tingxue replied: "It's the wrench of the crossbow."

Yan Yang actually didn't understand much, but for fear of showing cowardice, he simply kept silent and waited until she finished all the drawings before listening to her explanation carefully.

Mu Tingxue drew for half an hour.

The two men in the Tiangong Building were afraid to show their anger, and they would not leave each other for a moment, feeling anxious.

"It's done."

Mu Tingxue took a deep breath and put the fox brush aside.

Before the ink was dry, the regent and the Marquis of Qin couldn't wait to spread out the drawings of Lian Nu, looking at them carefully.

Yan Yang only saw two schematic diagrams on the drawing. The first one was called Zhang Crossbow ready to fire, and the second one was called Arrow Shooting. The bottom was marked——

A: hanging knife; B: looking at the mountain; C: ox; D: bow string; E: tooth; Ji: arrow.

Somewhat unclear.

The Marquis of Qin was a professional mechanic after all, and he quickly figured out the meaning: "Your Royal Highness, the first picture should depict the situation when the crossbow machine of the serial crossbow is tense: loading the arrows, pulling the suspension The knife and the ox rotated downward, and the tooth hook tilted forward and hooked the bowstring."

Mu Tingxue's eyes suddenly lit up: "That's right! The Marquis is really a genius. The cow is a jam. Using the cow to jam the pin on the tooth, the tooth and the bowstring are jammed, which is equivalent to accumulating arrows in the slot of a crossbow machine. Ready to launch!"

What's amazing is that Zhaoyi's father is a master of physics. He has never been exposed to repeating crossbows or modern pistols, but he can still explain the operating principles when he first saw the blueprints.

Yan Yang looked confused, what was his wife talking about?

What is the brother-in-law talking about?

Why can’t I understand this at all?

"I have never seen such an exquisite mechanical expansion design! Your Highness is a well-deserved mechanical genius!" Qin Houye sighed with emotion. His eyes fell on the second picture again, studied it for a while, and asked, "This The second picture should be the location of the six parts in the machine expansion at the moment when the repeating crossbow fires the arrow."

Mu Tingxue nodded: "That's right."

An ancient physics genius and a modern female doctor had a heated discussion about the firing principle of a crossbow.

"Turning the hanging knife backwards, the cow spins down, Wangshan also spins down, the bow string relaxes, and the arrow shoots out instantly, right?"

"Yes, the Wangshan part is equivalent to a sight." Mu Tingxue drew a picture and explained it in easier-to-understand terms.

Yan Yang found that he was completely speechless.

This is like two physics scientists sitting there discussing how to build a cannon, while a general who only knows how to fire cannons and bombs is staring blankly next to them.

There is a wall!

Of course, out of a hundred sentences, the regent could occasionally understand one or two key sentences.

The daughter-in-law said: "This repeating crossbow has a range of 1000 meters."

The regent was excited again: "The range is 1000 meters, three times that of the God's Arm Bow? Coupled with the fact that it fires twenty arrows in a row, the power is too terrifying!"

Mu Tingxue smiled and said, "Killing indiscriminately."

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