The design principle of the city gate winch is actually very simple, which is nothing more than changing the direction of the force through the principle of the pulley. Pen, fun, and www.biquge.info

Of course, a winch alone is far from enough to pull up a thousand-pound gate, so there are several pulleys used to adjust the torque on the camp wall where the camp gate is located.

How to reduce the force through pulleys is actually something that can be learned in modern middle school physics.

And the question in front of Liu Chan now is as simple as drinking water and eating for him.

Naturally, there will be no shortage of blacksmiths in the barracks, after all, fighting a war is the most expensive weapon, and the number and quality of blacksmiths also determine the combat capability of an army to a certain extent.

"Master Tang, the blacksmith has been brought." A guard specially dispatched by Zhang Yi walked up to Liu Chan and said with his hand.

Even Zhang Yi actually didn't want Liu Chan's personal safety to have any problems here.

Looking in the direction of the sound, I saw a burly wooden man behind the guard, as a blacksmith, such an honest and honest appearance can really give people a lot of security.

In fact, this blacksmith's name is Pu Yuan, nicknamed Tietou, every soldier and even general who took over the weapon from him is full of praise for his superb forging skills, in fact, he originally opened a blacksmith shop in the market, which is a rare celebrity in the township.

When he heard the other party's name, Liu Chan knew that he had picked up a treasure!

At this moment, he felt a bit like the protagonist of a time-traveling novel, and he could meet a historical celebrity who had not yet made a career when he went out.

Pu Yuan, an expert in knife making during the Three Kingdoms period, made 3,000 knives for Zhuge Liang in the Slope Valley in history. But making knives or something is not the reason why Liu Chan, a modern mechanical engineering dog, knows this person.

Liu Chan was able to have a slight impression of this person, but because this person put forward the argument that different quenching agents have different effects on the steel being smelted, and obtained an extremely high-quality quenching agent selection scheme through a large number of comparative experiments.

However, at this time, his identity is only a temporary military division, and there is no reason to recruit the blacksmith power in front of him, who is still growing.

But this does not prevent him from brushing the favorability of Corporal Lixian in front of him, his identity is estimated to be exposed after this battle, and when the time comes, he can extend an olive branch to this one, and at that time, with his favorability at this time, he may be able to pocket this "engineering dog" of the Three Kingdoms in one fell swoop.

"It turned out to be Mr. Pu here!" Liu Chan bowed, ignoring the surprise in the eyes of the other party and the people around him, and said in a solemn tone: "Mr. Wen has a very high attainment in forging a piece, so he has one thing to ask for. ”

The power of sugar-coated cannonballs is witnessed by history, Liu Chan's words and deeds made Pu Yuan, who has not yet reached the peak of his life, really moved, but the praise in Liu Chan's words still made him blush a little, as a simple blacksmith, he still knows how many catties and taels he has.

"The military advisor is serious, the contemptible person is just an iron-striker, how can he afford such praise from the military advisor. It doesn't hurt to say what the military advisor wants, and the contemptible people will definitely try their best to do it. Pu Yuan also clenched his fists and gave his hands, but he made a big gift, and the person who died for his confidant, not to mention him, a little blacksmith.

Liu Chan was stunned for a moment, but he was taken aback by the other party's rather literate demeanor, but he understood in the blink of an eye, a person who has mastered such a forging technique must be from a forging family that has been passed down from generation to generation, how can such a character really be a reckless farmer, only the children of a small family who have been educated and read can still be neither humble nor arrogant in front of their superiors.

A good blacksmith family can live a superior life and have extensive knowledge than those down-and-out scholars.

Soon, Liu Chan explained to the iron-striking expert in front of him the tools he wanted to rush to make.

To be precise, some parts that can be put together.

He's going to make a big hand-cranked winch! The general hand-cranked winch is relatively small, and the weight of the traction is not large because of manpower. This time, Liu Chan redesigned the hand-cranked winch to increase the torque, so that a smaller force can drive heavier objects, and at the same time, several pulleys of different sizes were added to the camp wall to further increase the torque.

This is absolutely feasible, because he has already drawn a preliminary design plan with the ground as paper and the branch as the pen, through detailed and precise calculations.

Made a full set of designs so quickly, which made Liu Chan himself actually a little surprised, he could only sigh that the original owner's brain was indeed easy to use, and his thinking speed and association ability had been significantly improved compared to his previous life.

He couldn't help but sigh when he looked at Pu Yuan, who hurried back and shouted to his apprentices for their hard work, and the soldiers around him who had been completely conquered.

"Liu Chan, let me complete the great cause in your heart for you!"

……

Because of the tight time, the forged parts are not very good in texture, only within the range of barely usable.

However, to Liu Chan's surprise, Pu Yuan actually created two parts! In addition, it was assembled according to the design drawings given by Liu Chan.

"The design of the military division is indeed exquisite, but the requirements for materials are also relatively high, but in such a short time, there is no ability to forge the best quality iron, but I think, since one winch cannot be completed, then, can it be completed with multiple winches? Therefore, it is self-asserted, and the military is not to blame. The man looked very excited at the moment, such a delicate original he had not made before, but it was just a small number of small objects, and the whole part of such an appliance was really a huge challenge for him.

But in fact, he was still a little apprehensive in his heart, the thoughts of the superior have always been difficult to guess, and if his unauthorized actions annoyed this extremely young looking military advisor, it would be bad. But it was he who was really happy to see the hunt, and he couldn't control his naturally forged hands.

Liu Chan didn't care about the complicated thoughts in Pu Yuan's heart, this blacksmith who would show all his mental activities on his face, in his opinion, was indeed a talent, worthy of the name of the famous craftsman of the Three Kingdoms in later generations.

Looking at the two manual winches that had been assembled and almost doubled in size, he really admired the wisdom of the ancients in his heart. Because there is no welding machine, Puyuan uses red-hot iron sheets dipped in iron powder to fit the parts interface, and the actual effect is more than one step worse than the stability and safety of welding, but in any case, all the parts are still assembled together steadily, and it does not affect the actual use effect.

Patting Pu Yuan on the shoulder, Liu Chan entrusted him to bring commendations to the other blacksmiths on his behalf, and promised to report his military exploits to him after the battle was over.

In Pu Yuan's excited promise, Liu Chan ordered people to lift the two machines in front of him, which did not look very beautiful, but contained cross-era wisdom, and walked towards the direction of the city gate. As for the other kind of wooden pulleys needed, there were still spare items in the camp at this time, and they had already been placed in the designated place under his orders.

The scouts in front had already arrived, and the regrouped Wei army, led by a new general, was approaching the camp of the Dingjun Mountain Range.

The war is on the verge of breaking out.

Fortunately, everything is now ready, and even Dongfeng is not owed.

"With this big victory, I will start my Liu Chan's great achievements in this world!"