The development level of the Ming Dynasty is really not very high now.

It took only three days for the new gun samples to draw the drawing to the clay mold making to casting and processing Sun Yuanhua.

Several disciples of Sun Yuanhua transformed a lathe into a chamber pulling bed in just three days.

Taichang has not been idle these days. He directly found the fast flat ground in the south of Wubei City and ordered people to draw horizontal lines with lime on it. Every other mile was a horizontal line, and ten were drawn.

His goal is to increase the range of the artillery to more than five miles first. If it can reach ten miles, it will naturally be the best.

Therefore, it’s almost done to draw ten horizontal lines.

Everything is ready, and the next step is to rifle and test the gun.

To be honest, Taichang didn't know how deep the rifle should be pulled, and he didn't even know how many rifle should be pulled.

Therefore, he ordered Sun Yuanhua's disciples to prepare many kinds of reamers for rifling.

The reamer he ordered to prepare had three sharp corners and six sharp corners. The rifle depth of the pull out was one minute, and the depth of the pull out was half minute.

Anyway, as long as you can try the difference, as for what the rifle is most suitable, you should be able to estimate it after the trial.

The process of rifling is very simple. Just clamp the barrel, turn it up first, then stuff the reamer from one end of the barrel and fix it on the slider, and then rotate the gears on the rack at a constant speed, so that the reamer from the rifling can pull from one end of the barrel to the other end at a constant speed.

Of course, the speed of turning the gear with manpower cannot reach an absolute uniform speed. In the future, steam engines must be used instead of human-powered pulling the reamer.

However, just experimenting at this time, there is no need to be such trouble.

After all, there is no trachea at this moment, and the steam engine cannot move with the rifled reamer.

This rifle is actually not a long time-consuming process, because it takes only a few blinks to pull a gun barrel, and it takes not long to fix the gun barrel.

The reamers prepared by Taichang ordered people to prepare four types of thickness and three types of artillery, two of which are the same caliber. The total rifled cannons drawn out are twelve, and the remaining three are smoothbore cannons without rifling.

The rifle of the twelve cannons was already finished in less than an hour. Taichang directly ordered Yuan Keli and Zhang Yuanfang to recruit a team of experienced gunners, pulled the cannons and walked towards the test gun site.

At this time, not only Sun Yuanhua was so excited, but even Yuan Keli and Zhang Yuanfang were so excited.

Because the range of this cannon is too important.

If the range of the artillery can exceed five miles, they can hang their tower ships and gunboats to attack.

If the range of the artillery can exceed ten miles, I don’t know how exciting it will be to fight.

Because there is no telescope that can see ten miles away at this moment, at least none of the continental countries.

In other words, before they could see them clearly, the shells hit them!

So how far is the range of these artillery? Are there any more than five or even ten miles?

Of course, you will only know this after trying it.

After the group transported the cannons to the test place, Zhang Yuanfang couldn't wait to ask: "Master, let's try that kind of cannon first?"

Taichang said without hesitation: "Try the one without rifling first."

Upon hearing this, Zhang Yuanfang ordered his soldiers to line up three unrched cannons, and then ordered them to load shells one by one to test the firing.

With a loud "boom", a shell flew out.

Everyone is familiar with the loud noise because this is the 500-pound Thunder God Cannon equipped by the navy.

Everyone is familiar with the range of this kind of artillery, which is about three miles away.

So, everyone aimed the telescope at the third horizontal line.

Sure enough, the shells fell near the Sanli Line.

Then there was a gun with a size of two and a half inches and a barrel of five feet long.

With a loud "boom", another shell flew out.

This loud noise was much duller than the loud noise just now, just like a muffled thunder.

The artillery shells flew out a relatively long distance, and there were no traces near the Sanli Line.

Taichang ordered the navy soldiers to run over and search carefully for a while before they found that the shell had actually flew to the near Liuli Line!

In other words, the goal of increasing the range to more than five miles has been achieved, and you only need to change the thickness and length of the barrel.

However, Taichang did not order people to stop the test shot.

With so many samples made, we naturally have to try the effect. Perhaps some artillery ranges may not be necessary if it can exceed ten miles.

Besides, this kind of two and a half inches of artillery shell is too small, which is as big as a fist. In this era when the lethality of the shell is basically due to smashing, such a small shell is naturally not good, and it does not have much lethality at all.

Then he ordered people to try a cannon with a muzzle of five inches and a barrel of seven and a half feet.

The roar of this kind of artillery is also dull, but the distance from shooting is only more than four miles, less than five miles.

This also confirms the conjecture that the proportional relationship between the gun caliber and the length of the barrel can determine the range. As expected, the greater the multiple, the longer the range.

Next is the rifled cannon.

Taichang means to try the 500-pound Thunder God Cannon first.

Because they are most familiar with the 500-pound Thunder God Cannon, they have also confirmed the range before the rifle is carved many times, just about three miles.

With this cardinality, they can accurately judge the impact of rifle on range.

At Zhang Yuanfang's order, the navy soldiers directly lifted the four Thunder God cannons with different rifles on them.

The test-firing effect of the Thunder God cannon with a depth of one point was not very good, and the shells had only flown out for more than three miles or four miles.

The roar of this cannon is not so violent, it gives people the feeling of leaking some air.

This should be caused by the rifle being carved too deeply.

The test-firing effect of the three rifles and the half-point depth was good, and the shells actually flew near the Wuli Line.

Moreover, the roar of this kind of artillery is not much different from the original roar.

This proves that the rifling half-part sound should be more appropriate, at least there will be no air leakage and pressure leakage.

Sure enough, this was confirmed when the test was conducted for the six rifled Thor cannons.

The six rifles have a single depth, or it is like leaking air. The roar is not very violent, and it has only been shot out for more than three miles.

The six rifles are different in depth at half a minute. If you bomb out, you can shoot it out more than five miles away!

This proves that it is better to carve six rifles than carve three rifles.

Moreover, the 500-pound Thunder God Cannon can exceed five miles by replicating the rifle range!

This result is really overwhelming.

Because they have cast a lot of 500 kilograms of Thunder Cannons, and they can meet the current range requirements by pulling them back and replicating the rifle.

In other words, they don’t have to work hard to cast new artillery for the existing Wolf-Tooth Warship and Dragon-Tooth Warship.

There are still eight artillery pieces that have not been tried, what kind of surprises will be next?

The next test was a rifled gun with a muzzle of two and a half inches and a barrel of five inches long.

The range increase of three rifles is not significant, and it is only more than six miles away.

The three rifles have a little more increase in the depth of half a minute, and the shells are almost falling near the Ten Mile Line.

The six rifles have a depth of one point, or it is like leaking air, and the range is only more than six miles.

The six rifles are terrifying, and the depth is half a minute.

With a "boom", the shells flew out of the gun mouth and a "chubby" roar sounded, which scared everyone.

This is the sound of the high-speed rotation of the shell!

This sound is a bit like the screaming sound of the artillery shells in later generations when they were released from the chamber.

So how far does this gun shoot out?

The navy soldiers searched for a while before finding it, and the shell flew one or two miles away from the ten-mile line!

Good guy, Taichang completely understood this time.

Six rifles, half a minute of depth, the gun caliber and barrel length ratio can exceed ten miles with a range of about twenty times!

In other words, as long as the gun barrel is added to a length of one meter, five-inch shells can be shot more than ten miles away.

The four-rifted gun with a muzzle of five inches and a barrel length of seven and a half feet also confirms this.

Now, the Ming Dynasty's artillery is at least invincible in terms of range. After understanding the role of the gun caliber, barrel length and rifle, they want to build cannons with a range of dozens of miles away!

Of course, the longer the range of the artillery is, the better.

Because the telescope's visual distance is still not up to date, I don't know if the telescope with a visual distance of about ten miles from the Ministry of Works has developed it.

Moreover, the gun barrel cannot be infinitely long at this moment. One meter long is about three meters long, which is almost the limit. If it is longer, it will be difficult to achieve mass production.

Another point is the thickness or weight of the shell.

After all, the lethality of the shells is mainly due to the weight of the shells, and you have to consider this when considering the range.

Therefore, Taichang finally decided to temporarily use the 500-pound Thunder God Cannon as the main equipment of the navy, because most of the machine tools of the artillery factory were developed based on this kind of artillery.

Moreover, as long as you engrave a suitable rifle on this kind of artillery, the range can exceed five miles, which is enough at this stage.

As for the long-range attack artillery, he decided to keep the caliber of five inches unchanged, and the length of the barrel was directly extended to one meter.

In this way, the shells can be universal and have a range of more than ten miles.
Chapter completed!