Pang Tong came suddenly, and Zhuge Liang and his brother-in-law's game of chess naturally could not continue.

Leaning slightly, Zhuge Liang greeted Pang Shiyuan, who hurriedly went up the mountain, at the door of the cottage.

"Brother Shiyuan, let's not go for two months, you are not lying on your stomach in your nest, why did you come to my Longzhong again today?"

Zhuge Liang asked with a smile.

This is Pang Tong, if you are someone else, Zhuge Liang said this, I am afraid that I will cheat a long time ago.

At this time, Pang Tong's clothes were very neat, but his eyes were deep-set, as if he hadn't slept well for a long time. Fortunately, he is in good spirits. Behind him were two ox carts, bulging and bulging, and I didn't know what they were pulling.

Pang Tong jumped off the donkey and said with a smile: "I, Pang Tong, are here today to let you Kong Ming take a look, the treasure we invented!" ”

As he spoke, Pang Tong smiled and pointed to the two ox carts behind him.

Obviously, the things pulled up by these two ox carts are the treasures that Pang Tong said.

"What kind of treasure is it, worthy of Brother Shiyuan's taboo to come to the treasure?" Zhuge Liang asked with a smile.

He was also very curious about what Pang Tong had achieved during this period of time.

According to his brother-in-law Pang Min, after Pang Tong returned home last year, he has been staying in the other courtyard to do some research; Only when materials and manpower are needed, will he greet the steward, and he usually can't see his figure; Even during the New Year's Pass and the Lantern Festival, Pang Tong didn't come out for a reunion dinner.

Of course, the New Year's Pass and Lantern Festival at this time are far less important and festive than those of later generations.

Pang Tong pulled open the rain cloth covering the ox cart, and saw that it was all wood.

To be more precise, they are all treated wood, and it seems that they can be assembled into uncontrollable utensils by simply splicing and adding mortise and tenon.

Patting the ox cart, Pang Tong smiled proudly: "These two carts of wood, just need to be assembled, and they can be assembled into a trebuchet." ”

After chatting with Zhuge Liang in Longzhong last winter, Pang Tong felt that he seemed to have found a goal in life.

With his phoenix chick's intelligence, it seems inevitable that he will go out of the mountain to assist Uncle Liu Huang in the future.

But before going out of the mountain, isn't there still more than a year of good time?

It's a shame to waste such time for high-IQ guys.

Therefore, with Zhuge Kongming's experience, Pang Tong felt that he should also find something to do, preferably like Zhuge Kongming, to make some great invention, so that the world can be praised for thousands of years.

So, after returning to Lumen Mountain, Pang Tong quickly found his target.

After more than two months of tinkering, an improved version of the trebuchet was pounded out by Pang Tong.

At this time, Pang Tong urgently needed to find someone of the same age and IQ, and his friend Zhuge Liang was the best candidate for Pang Tong's treasure.

If so, Pang Tong didn't care about Zhuge Liang's wedding, so he hurriedly pulled the dismantled trebuchet and went straight to Longzhong.

In fact, if it weren't for his sister-in-law's wife, Pang Tong would have been ready to directly invite Zhuge Liang to Lumen Mountain to appreciate the results.

……

Hearing that his cousin came to Xianbao, Pang Min was originally very curious, and after knowing that it was the assembly of the trebuchet, he was hopeless.

The principle of the trebuchet is very simple, and it is not too troublesome to make, and it can be built without a skilled craftsman. Because trebuchets were used for both siege and fortification, this thing was very common in this era.

Especially after the chaos in the world, which city is not always equipped with trebuchets?

Cousin Pang Tong engaged in trebuchets, which in Pang Min's view, was purely a waste of energy. Just find a guy who can do it by a craftsman, and do you need Pang Tong's mysterious research for so long?

However, Zhuge Liang's views are different from those of his brother-in-law Pang Min.

With Pang Tong's ability, if it wasn't an advanced trebuchet, he wouldn't have taken out the treasure.

For trebuchets, no one in this era understands better than him Zhuge Liang.

In the previous life of the original owner, although he did not strengthen or improve the trebuchet, he had seen many trebuchets.

Moreover, in those ancient cities in later generations, there were not too many trebuchets used to admire.

However, the trebuchets used for appreciation are all miniature versions and cannot throw stones. But all kinds of data are written very clearly, if you deliberately imitate it, it is not difficult to have a trebuchet with a range of 1,000 steps.

During the Qin and Han dynasties, trebuchets were only beginning to be used on a large scale.

To really strengthen and improve the trebuchet, it has to be after the Sui and Tang dynasties.

Later historical records record that when the Mongols besieged Xiangyang for the third time, they used an optimized trebuchet (of course, they called it Huihui Cannon), which lasted three months and blasted open the walls of Xiangyang City.

If the trebuchet of this era is used to bombard Xiangyang City, it is a question of whether the stones can fly over the moat!

It is important to know that the moat of Yangyang City is a direct reference to the water of the Han River. The widest part of the moat is nearly one hundred and sixty steps, and the narrowest part is seventy or eighty steps, plus there are more than 100 steps of foundation at the foot of the city wall, and the distance from the city wall to the other side of the moat is no less than two hundred steps.

More than 200 steps is the range of most trebuchets of this era.

According to memory, the largest trebuchet on the city wall of Xiangyang had a range of only 300 paces, just enough to shoot to the other side of the moat. Most of the time the stones thrown by other trebuchets fall into the moat.

Another point is that the trebuchet of this era, because of the ballistics problem, the front sight is actually very bad.

In many cases, when the range is sufficient, it is clear that the aim is the city gate tower, but the stones are grazing the city gate tower.

Of course, even if the range of the trebuchet in this era is not good, nor is the crosshair, but it is undeniable that in siege warfare and defense warfare, trebuchets are the king of war, and any stone ball falling in the crowd is a dozen casualties. The walls could not withstand the prolonged bombardment of trebuchets.

Trebuchet, almost comparable to the heavy artillery of later generations.

Therefore, if Pang Tong really comes up with an enhanced version of the trebuchet, in the future war, Uncle Liu's group will undoubtedly control the rhythm of the battlefield!

……

"Why don't we experiment?"

Although Zhuge Liang was asking Pang Tong, he was actually already looking for a place to assemble a trebuchet.

Soon, Zhuge Liang found the position where the trebuchet was placed: next to the big bluestone behind the thatched hall.

There, there are stones for trebuchets, and the terrain is empty. If the trebuchet is aimed at the back mountain, at most it will smash some flowers and plants, and there will be no harm to the residents near Wollongong.

The ox cart stopped at Daqingshi Pang, and Zhuge Liang and Pang Tong began to assemble the trebuchet.

Although Pang Min was not optimistic about his cousin's masterpiece, he was idle at this time, and he also worked on the side.

Soon, a trebuchet was assembled by three people.

This big guy made by Pang Tong is much the same as the currently popular trebuchet.

It is mainly a rubble arm, and Pang Tong has adjusted the length of its two ends. There is also the angle of the projectile, Pang Tong added a horizontal log, and the projectile angle was controlled at about 60 degrees obliquely.

The principle of leverage in later generations, as well as the parabolic principle, are known to junior high school students.

Zhuge Liang felt that this trebuchet might have really done the right thing for Pang Tong.

……

……

PS: Han system, one zhang is equal to ten feet, and two steps are equal to one zhang. One foot is about 23.3 centimeters, so one step is about 1.165 meters, and one zhang is about 2.33 meters.