When the emperor was almost ready, he sent someone to Orich to inform Marin to prepare and took two Mongolian doctors to Switzerland to "rescue the driver". So Marin began to prepare...

Marin was selecting his subordinates and war horses. When he was about to set off, Da Vinci, who was originally working in Denburg to study rotary wheels and fire muskets, suddenly came to Orich...

"Oh, it's Ada! Long time no see, how are you doing recently? By the way, are you still keeping that fat girl?"

Leonardo da Vinci rolled his eyes. Marin really didn't open any pot. As for the fat girl, she had been sent away by Leonardo da Vinci. After all, she was just a prostitute.

"Sir Baron, I'm back this time because I've completed the task you assigned me..."

"Task? What mission?" Marin didn't react at once. But soon, he was full of surprise:

"You mean, your rotary rotor firer has been developed successfully?"

"Hmm- that's certainly..." Leonardo da Vinci's face was full of pride. But soon, Marin's blow came:

"Why is it so slow? It's been a year..."

"You boy, do you think it's so easy to develop a machine? It will take several months to test it alone. During this period, I also broke a lot of barrels. Just selecting the barrel has been tested for a long time..." Da Vinci said angrily, no longer needing respect.

"The barrel is so difficult to develop? Wouldn't it be safe to make it thicker?" Marin was a little confused.

"Isn't it the trouble you are asking for? You said this is a cavalry-equipped gun, so the lighter the better. So, I had to try to control the thickness of the barrel. It's really troublesome. You require the barrel length to be 50 cm and the gun weight cannot exceed 3 kilograms... If it weren't for meeting your harsh conditions, the musket would be developed in a few months..."

"I forgot to mention these conditions..." Marin was also a little embarrassed. At the beginning, these conditions were proposed by Marin to form the "Black-shirt Knight". Cavalry use guns, of course, pursue lightness. Because the "Black-shirt Knight" had to carry several such guns. If one of them was so heavy, the war horse would not be able to bear it.

In addition, Marin also asked Da Vinci to use more powerful granulated black gunpowder. Therefore, if the barrel is a little thinner, it will easily explode.

Fortunately, Da Vinci was more cautious. When testing the barrel, he sent prisoners in prison to test it and did not go into battle in person. But this also led to seven or eight criminals being blown up during the barrel testing stage...

However, in the early days, Leonardo da Vinci and his craftsmen used gun barrels made of pig iron, and the chamber was exploded frequently. Later, Marin remembered that he had a team that specially provided cooked iron ingots for Old John's cannon workshop. So Marin arranged a team that processed the second process of the imported cast iron ingots from Britain and provided cooked iron to Da Vinci, which solved the problem of the barrel being easily exploded.

As for the problem of building fine steel springs, it has always been the top priority. Although Marin sent Kohler to Venice to find a supplier of soft manganese ore from Hungary, he has not actually purchased it. Even if the soft manganese ore is transported, Marin could not immediately produce 65Mn spring steel. That thing cannot be done in a short time. Even if Marin knows the composition of this spring steel, he cannot produce it in a short time. After all, he is not a steel engineer and does not know the process of making spring steel. It is said that the quenching of spring steel is also very particular. It is also divided into water quenching and oil quenching. Now, quenching requires the use of quenching drugs to strengthen the metal.

Marin definitely does not have quenching drugs and does not understand the principle. He can only choose between water quenching and oil quenching, or find a balance. This requires craftsmen to try slowly, and God knows when it will be done. Just controlling the manganese content of spring steel will have to work hard for a long time.

Therefore, at this stage, Marin can only choose the Leonardo da Vinci's plan - let several clockwork masters invited and tied from Italy to hand-made steel clockwork. All the materials of the clockwork are made by the masters, repeatedly forging them with pig iron bars, and the scrap rate is still very high...

In the end, the finished sample gun that Leonardo da Vinci brought to Marin, a cost of up to 5 gold coins...

"5 gold coins?" Marin screamed in surprise. A gold coin is worth 60 Finneys. 5 gold coins, that is 300 Finneys, which is equivalent to the 150-day salary of an ordinary person!

"This is the cost we have been studying for several months before trying our best to control..." Da Vinci also felt depressed. The cost of artificially building a small steel clockwork is too high.

In fact, the reason why the cost of steel clockwork is so high is that the people who built it are all master craftsmen and ordinary craftsmen, and it is difficult to create qualified steel clockwork. This job is very skillful...

But how much labor costs are for the masters? They spend a lot of time repeatedly forging and winding, and the cost can be reduced? Therefore, a rotary wheel fires a rifle, the cost is as high as 5 gold coins, and the selling price is estimated to reach 10 gold coins...

Marin was a little dizzy. In his imagination, the black-shirted knights each had to bring 5 such rotors to fire muskets. The cost of 5 gold coins per person was not to bring 25 gold coins to each person? This was still the cost price. Converted to the selling price, the muskets each person brought were worth 50 gold coins - a very luxurious one!

As for the performance of the gun, it is very good with the efforts of Ada and several masters of craftsmen. After all, the original version of the rotary rotor was a steel head that rubbed the clockwork steel sheet. If the steel head rusts, it might not be possible to fire. But Marin asked Da Vinci to directly use the front section of the steel base to sandwich flint, and the clockwork steel sheet rubbed the flint. The supply of Mars was very stable and the natural performance was good.

Moreover, Da Vinci also installed a copper plate shield to the medicine pool outside the fire transmission hole, which can effectively prevent rain. This medicine pool is very similar to the flintlock rifle, and is also a piece of iron to suppress the powder first to prevent the loss of the powder from shaking. However, when the spring of the large musket starts to rotate, the gears will push the iron plate away, revealing the gunpowder in the medicine pool, waiting for the sparks generated by the steel plate and flint to sputter in, thereby igniting the medicine pool, and ignite the charge in the barrel through the fire transmission hole...

Because there is a copper cover, as long as the medicine is not damp when loading, the gun can complete the shooting freely even if it rains...

After all, Leonardo da Vinci was a rigorous scientist. When the gun was sent to Marin, the gun had been tested for several months and there were almost no dangerous situations such as explosions.

Moreover, because the granular gunpowder is used, even if it is a short gun, the effective range of this gun is 50 meters, rather than the 20-step (30 meters) used by the Blackshirt Knights in history... After all, the blackshirt Knights in history all use powdered gunpowder with much less powerful power. And the blackshirt Knights used by Marin for the blackshirt Knights were all granular gunpowder, which had very different power.

Just like the early muskets, the effective range was less than 100 yards. But in the war period, because the gunpowder was completely granulated and all were finely processed, the effective range reached more than 200 meters.

Of course, this effective range refers to the effective killing distance, not the distance that can be aimed at. Because the bullets of the smoothbore gun will fly around the sky and the ground as long as they exceed 100 meters. Those who are aimed at by the smoothbore gun 100 meters away are all unlucky people with great luck, and they should have such a disaster...

If powdered gunpowder was used instead, Marin tested it and the effective range was indeed 30 meters (20 steps). Even so, it was enough.

Because the main targets of the Black-shirt Knight are those heavy armored knights with limited mobility, or those spear soldiers in a row. After all, both types of troops run slowly and stand as targets.

Even if they want to chase, the black-shirted knights are all lightly equipped (compared to the plate-armored knights). Even if they chase, the plate-armored knights cannot catch up. Those spear infantrymen cannot catch up even more.

However, the black-shirted knights can face the plate armor knights and calmly shoot the 30-gram projectiles weighing from the five loaded rotors in their hands at the bulky plate armor knights. They can even go back and shoot while running away.

Mongolian archers may need superb archery skills when playing the "Manguda" tactic. However, the black-shirt knight's requirement for this move is not that high. Because when you turn back and aim, you can just aim correctly and don't need too strong pulling force or something. At most, you can be recoiled by the ignition gun, but you can also withstand it. Unlike Mongolian archers, you need hundreds of pounds of pulling force. The requirements are very high.

When the Black Shirt Knight first came out, he relied on his vulgar tactics to abuse the French Knight into a dog, and he still attacked when it rained. After the French suffered a great loss, the best countermeasure that the French thought of was to hire the German Black Shirt Knight to fight...
Chapter completed!