Installing eccentric wheels at both ends of the bow or crossbow is a hint that Li Chengqian got on the compound bow in later generations, simply put, it can get a higher arrow speed, and at the same time produce a lever when the bow is pulled away at a certain angle, so that the bow becomes easier to control.

Everyone knows that power is equal to strength multiplied by speed, so when the elastic force of the bow arm is constant, the faster the initial velocity of the arrow, then the more powerful it will be and the farther it will fly.

However, Li Chengqian didn't need to tell Liu Min about these things, and he couldn't understand them, unless he went through a series of modern education in later generations, no one in Datang could understand what P=FV was.

Impatiently left the workshop, Wang Chenghu didn't need Li Chengqian's urging, the carriage was hurrying, it can be seen that this product is also full of curiosity now. If it weren't for the fact that the horse was too old and the car was too broken, it is estimated that Wang Chenghu would be able to drive the car into flight.

Following the way he came, under Li Chengqian's strong observation, he soon found traces of the two on the long street outside Dongshi.

Let Wang Chenghu slow down the speed of the carriage, follow behind Wu Chen and the woman from a distance, and watch the woman beat Wu Chen with the empty sword scabbard in her hand, Li Chengqian and Wang Chenghu invariably showed strange smiles, and even Cheng Huaan, who didn't speak much, curled the corners of his mouth.

In this way, Li Chengqian and the others followed from a distance, until Wu Chen inadvertently turned back.

"Your Highness, this is ......" Wu Chen looked at Li Chengqian and the others with strange expressions, and pointed to the woman in light pink clothes awkwardly, ready to introduce everyone.

"You don't need to say it." The woman took the scabbard and slapped Wu Chen again, and said to Li Chengqian: "Li Yue, a folk girl, has seen His Royal Highness the Prince. ”

"It's as simple as that?" With a peculiar expression of a bad friend, Li Chengqian asked Wu Chen.

"Uh~, she, she is, she is, it's my junior sister, I ......" Wu Chen, who had always been neat, stammered, and expressed his words incomprehensibly.

In the end, Li Yue simply interrupted: "The folk girl is Wu Chen's fiancée." ”

"Eh, old Wu, you've never mentioned this." can fall into the well, Li Chengqian will never let go of the opportunity.

"Your Highness! Your Highness! Wu Chen had a pitiful expression on his face, and kept clenching his fists and begging Li Chengqian to show mercy.

Others don't know, Wu Chen, who has been with Li Chengqian for almost a year, won't know that Li Chengqian's Zhang Po is the most important thing to open the conversation box, he can talk about the dead alive, and if he is allowed to talk for a while, he may be able to say something.

"Owe us two meals, we choose the place, and if it doesn't work, give us a happy word." Wu Chen confessed, and Li Chengqian took the opportunity to blackmail.

"Done! Yes! People are under the eaves, how can they not bow their heads, Wu Chen nodded helplessly.

"Okay, don't embarrass you, take your daughter-in-law's sword away." Li Chengqian knows what is appropriate, and making a few jokes appropriately can show Wu Chen's status in the royal family in front of Li Yue, but if he says too much, it will be counterproductive.

Taking the long sword with a flickering cold light from Wang Chenghu's hand and handing it back to Li Yue, Wu Chen smiled and said, "Thank you, Your Highness." ”

"Don't come to this set, and remember to return the two meals when you look back." Li Chengqian scolded with a smile, and then said: "I will go to the Shi Tan Division to get some silver in a while, and find a better yard to buy it, after all, you are not alone now." ”

"Your Highness, don't worry, I'll ......" Wu Chen planned to excuse himself, he had been following Li Chengqian for a long time, and knew that he didn't actually have much money, although it was enough to buy a yard, but the money left was really not much.

", the emperor is not short of hungry soldiers. Also, from now on, give you three days off. Li Chengqian waved his hand impatiently, made a gesture for him to get out quickly, and then hugged his fist at Li Yue and said to Wang Chenghu: "Let's go, go back." ”

Although the people of Datang are open, Li Chengqian still thinks that it is better for his subordinates' wives to talk less, otherwise once they are misunderstood by their subordinates, they will easily receive blades, and they are Wu Chen, a guy with more than ten knives on his body.

let go of Wu Chen, Li Chengqian finally had nothing to do now, went back to the palace slowly, and stopped sleeping, but he was half asleep and half awake, always feeling that he seemed to have forgotten something, and he couldn't remember it when he was in a hurry.

It wasn't until the guards dug through the door and shouted 'Your Majesty's urgent call' that the word locust plague came out of Li Chengqian's mind.

The spirit jumped down from the kang and asked the attendant to open the door, and Li Chengqian asked urgently: "What's the matter, is it a locust plague?" ”

"The minister doesn't know, Your Highness should hurry up, Your Majesty is already throwing things." The guards gasped for breath, and in the warm and cold weather, they actually ran out of sweat.

"Okay, I'll go over now, you sit there and rest first, and then go back when you're done." After putting on his shoes under the service of the maid, Li Chengqian gave a word to the guards and went out.

When Li Chengqian arrived at the Lizheng Hall and had not yet entered the door, he was startled by the tea cup that flew out of it, and Lao Li's roar also came out: "Don't tell me that it's useless, I just want to know what to do now." ”

"Prince, get me in, hide your head and show your tail into a harmonious system." Because of the sunshine, although Li Chengqian did not show his head at the door, his shadow was still obvious.

"The son has seen the emperor, and he also asked his father to take a break from the wrath of the thunder and take the dragon body as the key." Li Chengqian, who was angered by the old man, honestly entered the house, honestly greeted him, and admonished him in a proper manner.

"I don't have to worry about you, you can tell me what to do now." The old man seemed to be really angry, and when he saw Li Chengqian coming in, he let him make up his mind directly.

He didn't know what Li Chengqian could say or why the old man was angry, so he could only look at the eldest grandson Wuji and the others who arrived before him for help.

"Your Majesty, the prince still doesn't know......" In the end, the eldest grandson Wuji was interesting enough to stand up and relieve Li Chengqian.

"Let's go and sit on the side." Lao Li glared at Li Chengqian fiercely, suppressed his anger, and said in a deep voice.

Li Chengqian shrank his neck and obediently hid in a chair behind a pillar to sit, but he wondered in his heart, didn't the old man have been prepared for a long time, why did he lose his temper so much now.

"Tell me what they want to do, am I sorry for them, why do they have to do things at this time." Li Er quickly threw Li Chengqian aside, and after glancing at the eldest grandson Wuji, Xiao Yu, Du Yan, Fang Xuanling, Du Ruhui and others, he asked angrily.

"Your Majesty, please calm your anger, there is always a solution to the matter." Du Ruhui and the others should have just come in, and they didn't know what was going on, so they could only speak perfunctorily.

"I just want to know how to solve it, half of the Tang Dynasty is making a locust plague, and there are still some people who are spreading rumors and causing trouble, causing the people to panic, you are all important ministers of the court, tell me what you think." The temper was not much, Li Er finally calmed down and planned to have a good talk.