It's okay if Zhang Wudian didn't explain. Once he did, Zhang Fengyi was stunned.
Huo didn't understand mathematics either, so he was confused. However, this method of measuring distances with bare hands is very useful in the military.
For example, calculate the distance from which the enemy enters the bow and arrow coverage area. Measure the distance from which the enemy charges. At each node, make corresponding responses. These are very practical knowledge.
As a female general who is obsessed with military affairs, Zhang Fengyi naturally knows the value of this algorithm. She was so anxious for a moment that she took Yang Fan's arm and acted coquettishly. She insisted that Yang Fan teach her.
Yang Fan had no choice but to agree to him and write a pamphlet for her, starting from scratch and explaining trigonometric functions and this method of indirect aiming and distance measurement.
Yang Fan also studied on his own by looking up information. He didn't understand these military knowledge. However, now that he is a general leading troops, he naturally has to study hard.
"Mr. Zhang, when we Chinese people want to knock someone down, we usually ask whether he needs to be on his back or a dog eating shit. Otherwise, there is no technical content." Yang Fan said with a smile.
Zhang Wudian laughed loudly. It is true. Chinese people do things differently from Westerners. We are more meticulous, and for the same thing, Chinese people can do all kinds of tricks. Chinese people can develop everything into
an art.
"Look, there is no Sulu Ding battle flag on the hillside. Let's use that as the coordinate. The cannonballs will fall within a range of 300 meters around the battle flag. As for whether we can hit those Taijis, it depends on God's will." Yang Fan
Speaking of.
Zhang Fengyi asked: "Brother Yang, can't you hit that battle flag?"
Yang Fan said: "If we use that battle flag as the center, it is absolutely impossible to hit that battle flag. It will only be scattered around."
At this time, Huang Hao came in and reported: "Sir, the three artillery pieces are ready. They can fire at any time. Please give the order."
Yang Fan used a telescope to look at it. More than 200 shield carts on the hillside were ready. The slaves were pushing the carts under the whip. These slaves had more yellow hair and blue eyes. Judging from their appearance, they were from various ethnic groups in the Western Regions captured by Oirat.
people.
The desolate horn sounded. This was the clarion call for the Mongols to attack.
On the hillside in the distance, more than 200 tael-shield vehicles were lined up in a row, slowly pushing towards the bottom of the mountain. Behind them were more than 3,000 matchlock gunners, hiding behind them. Behind them were another 3,000 Mongolians.
The infantry came on foot. They followed behind with shields in one hand and scimitars in the other.
On the left and right flanks and at the back are three cavalry phalanxes of 5,000 men. They are the supervising team to prevent the infantry in front from escaping. They also serve as the final assault force. If these cavalry also fail, they will completely escape.
"Aim at the battle flag, fire ten rounds rapidly, and use high-explosive bombs." Yang Fan ordered.
"Here!" Huang Hao performed a military salute, turned around and ordered to the captain: "Main gun position, high-explosive shells, ten rounds of rapid fire, target battle flag on the hillside. Fire immediately!"
"Here! Main gun attention, high-explosive shells, ten rounds of rapid fire, battle flag on the target hillside. Fire immediately!"
"The main gun has been received, high-explosive shells, ten rounds of rapid fire, battle flag on the target hillside. Fire immediately!"
As the order was given, the gunners at the main battery position immediately began to aim. They shook various cranks, and through the gears, the huge artillery pitched and swung, and gradually put the target into the circle of the sight.
Immediately, the gunner waved his hand, and a gunner suddenly pulled the firing rope. The fire tube coming out of the fire door spurted out flames, igniting the propellant pack.
Boom! There was a loud noise, the 203mm main gun was astonishingly powerful.
Although Yang Fan and others were in the cab, they felt the ship shake violently and almost jumped up.
Looking through the porthole, on the front gun emplacement, a dark, huge cannon violently sprayed flames and thick smoke forward. The entire ship suddenly slid backwards under the huge recoil. It was completely gliding.
It stopped after more than ten meters.
Fortunately, everyone has experience and will quickly grab the various handles when firing.
This is the first full-charge fire. Because the maximum range is used, five propellant packets are loaded at one time. Plus a warhead weighing 100 kilograms. This is the largest warhead that can be used by the 203 gun. The load of this warhead
The medicine weighs fifty kilograms.
Because the power of fertilizer explosives is equivalent to 60% of TNT. The charge of this shell is equivalent to thirty kilograms of TNT. This is far more powerful than the 155mm, which is the six-inch howitzer of later generations.
Taking the Meiliguo 155HE as an example, the length of the M107 shell reaches 800 mm, the warhead weighs 43.2 kg, of which the charge is about 15.8% of the total weight, and it contains 6.83 kg of TNT explosives, with a range of 17.5 kilometers.
The reason why the charge is so small is because modern artillery has high bore pressure, and the weight must be spent on the strength of the shell. One side of the shell is crushed by the bore pressure in the barrel, so the charge is less.
Yang Fan's artillery has a very low muzzle velocity, a very short range, and a very small chamber pressure. Therefore, when Fu Laoliu was designing it, he dared to use half the weight for the shell body and half the weight for the charge.
The charge of the 155mm howitzer is about 6 to 10 kilograms of TNT. Although it doesn't look like much, its power can kill unprotected living targets with a radius of 40 to 50 meters. It can kill an area as large as a football field.
I'm not kidding, but this distance is mainly due to fragmentation damage.
When this kind of artillery shell hits the ground, it can create a large crater with a diameter of about 5 meters and a depth of 1.8 meters. Its shock wave power can destroy light armor within a range of 3 meters and multi-layer brick walls within 10 meters. Most of them are equipped to deal with these.
The leather-armored Mongolian cavalry is simply a super killer weapon.
The 203 cannon is not comparable to the 155 cannon. The two are not on the same channel.
The distance of 3,500 meters was reached in an instant in front of the artillery shells.
Almost at the same time, a huge smoke cloud rose from the distant hillside densely covered with Mongolian infantry and cavalry.
The deafening sound could be heard even three kilometers away.
The first cannonball obviously missed the target and landed among a group of 5,000 cavalrymen on the right wing.
The huge explosion blew a large area of cavalry into pieces. There was no possibility of survival within fifty meters in diameter of the center of the explosion. Both men and horses were blown into pieces and thrown into the sky.
The shock wave swept a distance of more than 100 meters around. The cavalry who were not killed also fell off their horses one after another, and the war horses weighing three to four hundred kilograms also fell to the ground.
Gushi Khan and others watched in horror as the cavalry on the right wing was destroyed by a cannon fired from the black ship.
Originally, these cavalrymen were frightened. They had fired at black ships on the river embankment before and were knocked to pieces by terrifying machine cannons. Unexpectedly, they encountered cannons this time. This huge explosion frightened the Mongolian horses.
.
The entire right wing is a picture of dolphins running into wolves, and the whole thing is in chaos.