"The rifling is the soul of the gun barrel, and it is also called the rifle line."

"The rifling is in the barrel, the concave part is called the yin line, and the convex part is called the yang line..."

"The rifling function can give the warhead the ability to rotate, so that after the warhead comes out of the chamber, it can still fly out in a predetermined direction, making it have a longer range and higher hit accuracy."

After Zhao Ji finished writing this annotation on the design drawing, he was afraid that Chen Gui and Li Ji would not understand it, so he asked Liang Shicheng to get a projectile.

Zhao Ji held a projectile with his right thumb and index finger and demonstrated it to Chen Gui and Li Ji while saying:

"The flintlock rifled gun I drew on rice paper. If the rifle is rifled in the barrel and the gun is fired, the projectile will rotate on its longitudinal axis when passing through the barrel.

After the projectile comes out of the barrel, it spirally rotates and flies, maintaining the conservation of angular momentum through the gyro effect, thereby increasing the ballistic stability, and also increasing the effective range and terminal lethality!"

Zhao Huan, Zhao Kai, Zhao Gou, Chen Gui, Li Ji, Liang Shicheng and other people present heard what Zhao Guanjia said. Although they could not fully understand it, they felt that it made sense.

Zhao Ji knew from the slightly puzzled looks in Chen Gui's and Li Ji's eyes that they would not be able to understand the scientific terminology of modern society to them.

Zhao Ji asked Chen Gui and Li Ji:

"I would like to ask you two dear friends, have you ever played with a top?"

Chen Gui and Li Ji both answered: They had played it when they were children.

Zhao Ji said: "When playing with a spinning top, after whipping the top with a whip to make it spin rapidly, even if you remove the whip, the top can still spin on its own for a while, right?"

Chen Gui and Li Ji both nodded in agreement.

Zhao Ji smiled slightly and said:

"The projectile will rotate at high speed under the action of the rifling, which is the same principle as the high-speed rotating gyroscopic motion after the whip is removed.

When the projectile moves in the chamber, the rifling forces it to rotate at high speed, and under the action of the turning moment, it will also make a conical motion around the ballistic tangent with its center of mass as the center.

The tangent between the projectile axis and the ballistic trajectory always maintains a small swing angle without tipping over, thus ensuring the stable flight of the projectile."

When Zhao Ji finished saying this, he also marked the annotations with an imperial pen next to the rifled musket design.

Chen Gui and Li Ji, the two masters of firearms manufacturing in the Song Dynasty, were stunned when they heard this, and the others were even more confused when they heard this.

However, Chen Gui and Li Ji felt that Zhao Guanjia used the spinning top as an example to explain to them, which made them understand a lot, and they felt that Zhao Guanjia's explanation made sense!

They both marveled in their hearts: The Zhao Guan family is really as smart as heavenly beings!

After Zhao Ji saw the admiring expressions of Chen Gui and Li Ji, he pointed to the rifled musket design he had just drawn and said:

“The musket is rifled, which allows it to have a longer range and more accurate hits;

This principle can also be applied to artillery. Please remember it, dear friends.

After I leave the test firing range outside the firearms manufacturing workshop, the two beloved ladies will lead the craftsmen to successfully transform and upgrade the rifled musket. This method can also be used on artillery!"

Chen Gui and Li Ji kowtowed and said with great admiration:

"I will obey my orders and live up to my expectations."

Chen Gui started again: "I am stupid, I dare to ask Your Majesty, what is the appropriate number of riflings?"

…
Chapter completed!