The principle of the rocket is very simple, and it is not difficult to make it. The difficulty is the hit rate and accurate explosion. Qin Huan and the craftsman tested it for several days and hit hundreds of them, and finally determined the delay time and launch angle of the fuse.

Finally, the rocket, which was assembled with bamboo and wood, plus cotton and gunpowder, was officially finalized and began mass production.

The rocket was named thor-1 by Qin Huan. It is 2.1 meters long and weighs only 42 kilograms. The best range is 300 ~ 400 meters and the longest range is 500 meters.

The effective killing radius is five meters, which is equivalent to the power of the wooden handle grenade during World War II. There is no way. The killing power of the broken bamboo chips produced by the explosion is limited. We can only rely entirely on the air wave generated by the explosion of ten kilograms of black gunpowder to cause fatal damage to the enemy.

Even so, it is much stronger than the shells fired by cannons in this era, and the advantage is obvious.

The first is easy to carry.

A person can carry more than 40 kilograms and run, which is not comparable to hundreds of thousands of kilograms of artillery.

In addition, multiple missiles can be launched at the same time, which not only has fast launch speed, but also has very dense firepower.

Of course, the biggest advantage of rockets is not that they are easy to carry or fast to launch, but that they are cheap, low-cost and can be produced in large quantities.

Although the size of bamboo cannot be standardized, it can be replaced by wood, so the main materials are wood, a small amount of cotton and gunpowder.

The cost of wood and cotton is almost negligible, and the cost of gunpowder is equally frightening.

The nitrate with the largest content can be seen everywhere near the Maokeng. Finding a large nitrate mine can't be used up for decades. It's just that it takes a little effort to boil and refine.

As for charcoal, let alone sulfur, which may be the most expensive, it is rare in China, but there are many in Japan and overseas. As long as we find the sulfur island in the Pacific Ocean, it will be enough for hundreds of years.

In more than half a month, a mere 100 craftsmen built more than 500 rockets. If the gunpowder was not running out, thousands would not be a problem.

More than 50 catapults were built. As soon as the weather cleared up, Qin Huan couldn't wait to launch a general attack to completely solve the Tianxiong army in the city.

In Taihu County, in the open space outside the South City, thousands of carpenters were busy one morning. A stone throwing machine was pushed up and arranged 100 steps away from the city wall.

Twenty rocket launchers are located 50 steps behind. Eight rockets are placed on each launcher, pointing obliquely towards the city.

These launchers are not only equipped with wheels that can be moved, but also the upper part can be adjusted up, down, left and right. Coupled with the number of engravings marked with Arabic numerals, they are really about to catch up with the mechanical products of previous generations.

Qin Huan looked at the twenty, the advanced and outrageous launchers, and was filled with emotion.

He knows.

I'm afraid that in today's world, Chinese carpenters can completely realize his ideas with various tools and exquisite craftsmanship.

Of course, the premise is to use wood. If you use metal, you may have to be blind. The carpenter's plane and saw can't move the steel. With the blacksmith's two hammers, you can't knock out the parts he wants.

The Qin army made big moves outside the city early in the morning, which naturally attracted the attention of the defenders in the city. They pointed to the distant catapults one by one, with a trace of fear on their faces.

Lu Xiangsheng was also not in the mood for breakfast. He hurried to the city and looked at the 50 tall catapults with a frown.

However, he didn't worry too much. Although the destructive power of the 50 stone throwers was great, it was just like that. At most, the other party hid at the foot of the wall when launching, and the other party defended on the wall when charging. Anyway, he still had 30000 or 40000 people in his hands, which was sufficient.

Just as Lu Xiangsheng caught a glimpse of the row of wooden shelves behind the catapult, when he thought it was something, he rode to the bottom of the city.

"Listen to the people above. My king has lost his patience. If you continue to be stubborn and want to bury Lu Xiangsheng, you will die later. When you get to the hell, don't blame us for being cruel. To tell you the truth, my king has created a new weapon to destroy the sky and the earth, which is dozens of times more powerful than a cannon..."

"Hum, don't bluff here. Do you think the governor and my Daming soldiers are frightened? Go back and tell the Qin thief that I swear to live or die with Taihu County. If you want to attack the city, just put your horse here and don't show your tongue here. "

Lu Xiangsheng snorted coldly to the knight under the wall with his back to his hands. Obviously, he thought Qin Huan was at a loss. He even used this means to scare the three-year-old child.

"Well, well, let's wait and see. I'll see when you can be tough. Don't surrender today."

The knight was also angered. He was so angry that he smiled back and slapped his horse back. He had seen the power of the rocket with his own eyes.

Qin Huan was not surprised that Lu Xiangsheng would die to the end. In the past two months, he had exhausted coercion, inducement, heart attack and propaganda, so he didn't bother to be wordy. The reason why he sent someone to persuade him to surrender again was to make the other party have a mental preparation so that he wouldn't be a dead ghost and go to the king of hell to tell him that King Qin didn't uphold justice.

"Fire a powder bag for me first."

At Qin Huan's command, 50 stone throwers started. Fifty round explosive bags wrapped in silk and cotton flew towards the city, each weighing 20 kg.

Boom, boom

With a loud noise coming from the city and a huge black smoke rising, the shocking explosion went out of control, making more than 30 rounds.

For a time, the city was full of flying sand and stones, and countless houses collapsed. The defenders in the city were blown up in panic and ran around. Obviously, they didn't expect that the other side's stone throwing machine threw not stones, fireballs, but explosives.

After the explosion subsided, Qin Huan was quite dissatisfied. Not only did not one of the fifty shots fall on the city head, but also less than half of them failed to explode successfully. This hit rate, this explosion rate, is almost unreliable than a cannon.

But fortunately, the power is still huge. Although only more than 30 were exploded, the destructive power and deterrent power are far from being comparable to hundreds of thousands of solid iron eggs.

Seeing that the disturbance in the city was soon calmed down, and the noise in the city gradually decreased, Qin Huan had to admire Lu Xiangsheng's good governance of the army. With a wave of his hand, the stone throwing machine worked again.

Anyway, the people in the city have long been dried out by Lu Xiangsheng. He is not afraid of bringing disaster to the fish in the pond. He must be almost. As long as he can throw the explosive bag into the city, he can't help it. As for rockets, he really doesn't want to use them unless he has to.

Because it can not only attack the city, but also fight field and water battles, he wanted to keep it as much as possible against Zuo Liangyu and the navy of the Ming army.