When testing the gun, out of caution, Zhang Guoan tied the arquebus to a tree, stood farther away, and pulled the trigger of the gun with a thin rope. Pen % fun % Pavilion www.biquge.info

A normal amount of black fire/medicine can't blow up the chamber of an arquebus made of good iron, at least there has been no explosion of the chamber yet, and of course the firing range is not too far.

He placed a gram of propellant, compacted it, and then pushed the bullet stick into it with buckshot wrapped in deerskin, and then poured black fire/medicine.

He pulled the trigger slightly, and the fire that was burning with the fire rope plunged headlong into the powder pool, and a puff of green smoke came out, and the lead bullet flew out with a whistle!

Zhang Guoan observed that the muzzle of the arquebus did not emit green smoke except for some broken skin, which was a success.

However, he put two more grams of propellant to see the limit.

As a result of the test, the fire door was deformed, and the gun was considered useless.

In the end, he simply released three grams of propellant, and sure enough, it exploded.

From this, it can be seen that the iron pipe wrapped in an iron pillar can withstand a maximum of one gram of propellant.

After Zhang Guoan went back, he wrote down the process of processing the propellant in detail, especially some important parts, which he specially emphasized.

He thought about the personalities of those half-grown children, and felt that it was good to let Mei Lezhi and Mu Mu be in charge of processing and production, these two people were calm and usually spoke little.

He's starting to get ready to change his guns, and of course the arquebuses can still be kept, and the arquebus society is now bigger than the Arquebus Society.

When he returned to the estuary area, he found Mei Lezhi and Mu Mu and showed the combustion of the new propellant on the wooden board.

These two half-sized men had been playing with arquebuses for a long time, and they said happily at the time: "This thing is full of medicinal power!" ”

Zhang Guoan smiled and said, "Are you willing to learn how to process it with me?" ”

The two half-grown sons agreed at that time------ very happily agreed to work with Zhang Guoan tomorrow to process this thing.

Interest is the best mood at work.

After Zhang Guoan sent the two and a half children away, he took out his laptop and clicked on the database. I took a look at the information they usually collected.

They also came with a hand-cranked charger, which was too big for the solar-powered one.

Zhang Guoan chose a Mini rifle.

Zhang Guoan's arquebus barrel has always been hand-forged by the craftsmen of the Great Song Dynasty, and almost all of the guns they use now are smoothbore guns, in order to reload the rapid projectile is generally sub-caliber, which can be wrapped in deerskin to ensure that the lead bullet is not deformed when stuffed, and there is good sealing.

Although this sacrifices range and accuracy. However, salvo fire can be relied upon to increase the density of fire and the rate of hit.

Why didn't Zhang Guoan immediately equip the rifled gun, although it has a slow rate of fire, but it has high accuracy and long range?

This question actually involves many other aspects: the cost of manufacturing muskets, training, the size of equipment, and so on.

A rifled gun can cost as much as two or three smoothbore guns, and because of the rifling, those debris are not easy to clean, the life of the gun is shorter than the smoothbore barrel, and the rate of fire is extremely slow.

For the same price, an army rifled gun can fire one bullet per person per unit of time, while a smoothbore gun can reach 9!

Therefore, he could not start this rifled gun project for the time being, although he had the rifled knives that Song Ziqiang left for him.

The requirements for the barrel of the smoothbore gun can be said to be very low, as long as the chamber is not exploded. To be able to launch a bullet, that's enough, the problem is so simple, if you want speed, you can't pursue accuracy, and you completely rely on the density of fire to stack the hit rate.

At the range of the arquebus, Zhang Guoan could shoot at the target with a pistol gun.

Another point is that rifled guns require a high degree of close coordination between the bullet and the barrel.

In the era of front-loading guns, rifled gun projectiles would not be embedded in rifling and would not rotate if they were still sub-caliber. The meaning of rifling is lost.

However, if the projectile is too large, it cannot be loaded into the chamber, and the size of the projectile can only be made to fit the caliber or slightly larger than the caliber of the gun. However, it does not affect the loading in, so the accuracy of the projectile is much higher for rifled guns than for smoothbore guns.

The Mini bullet is very special, its tail is U-shaped, and it is completely embedded in the rifling by the expansion of the tail under the impetus of the propellant, forming a spiral flight!

So it can fit in the form of a sub-caliber, and the firing range can reach eight hundred meters. Accurate shooting can be achieved within 500 meters.

That's great!

But here is the question, how much expansion is in the tail of the Minnie bullet.

The History of Rifles mentions that the Freefield rifle with the Mini Bullet with the Wooden Plug to assist in the expansion has a clearance of 0.01 inches, that is, the expansion of the bullet in the radius of the central axis of the barrel does not exceed 0.13mm.

But at that time, Europe had already adopted stamping technology to process bullets in the machining industry. They were able to guarantee a simple bullet error of less than 0.001 inches, and the measurement accuracy at the time was one ten-thousandth of an inch.

This was the accuracy of the barrel when it was mass-produced in the factory at the time.

If the craftsmen of the Great Song Dynasty produced guns with such precision under handicraft conditions, could it be realized?

Zhang Guoan knew in his heart that it would definitely work, but it would never be mass-produced, and it was not the same thing that the craftsmen of the Great Song Dynasty could produce it and produce it in large quantities.

In order to achieve mass production, one key problem must be solved: precision!

Zhang Guoan can conclude that even if he has vernier calipers, even if he has a sufficient number of skilled craftsmen of the Great Song Dynasty, the barrel caliber parameters produced by them will have their uniqueness, that is to say, the barrel parameters produced by each craftsman are "distinctive", and each gun must correspond to a separate bullet parameter.

At this time, Zhang Guoan remembered what Song Ziqiang said to himself.

Song Ziqiang said at the time: "Guoan, you don't have to worry about this, if you feel that you are about to develop a mini gun, you can let them make it by hand, and draw rifling, we have knives, you can let the carpenter use a carpentry lathe to pull it."

A gun with a different bullet parameters is not afraid, you can give the gunner different cast iron molds and let them make their own lead and make their own gun bullets! ”

Zhang Guoan suddenly became enlightened at that time, anyway, the gunman just used his own gun!

Regarding the firing equipment, Zhang Guoan wants to skip the flintlock style directly, and the ------ with the fire cap type is already like this, and if you don't play that, it will only have a seventy percent launch success rate!

However, he could consider exporting to the Great Song government at a later date.

The hammer, anvil, and trigger of this firing equipment are all small facts, and the key lies in the material of the V-shaped spring.

Zhang Guoan could only remove some of the steel plates at the end of the Zongshen Zhengxiang three-wheeled motorcycle, and it was estimated that he could make thousands of V-shaped springs.

However, he also believes that no matter how poor the steelmaking technology of the Great Song Dynasty is, their output is high and the number of steelmaking times is also large, and sooner or later they can also shock the world and make a qualified furnace of medium carbon steel.

The problem of the fire cap is not a problem, he has prepared two ways to solve it. (To be continued.) )