After honing thousands of times, the new killer move was finally practiced.

Hong Fan paced to the iron rod, touched the broken wound that still had residual warmth, recalled the gallop just now, and looked forward to Gu Zixiong for a while.

"Now that the framework is through, it's time for some tinkering and familiarization."

He returned to his desk and wrote down the trial in its entirety.

The first sheet of paper is folded up and set aside, revealing the text underneath.

"Long-range kinetic weapons pre-research".

Then Hong Fan opened the wooden box and took out twenty iron bullets from it.

More precisely, twenty warheads without shells and without primers.

These warheads were personally cast and polished by him in the blacksmith shop yesterday, and although they are not as good as machine tool pressing, at least the texture is uniform and usable.

Since the accelerated success of "gas", he naturally remembered a weapon that was often used for hunting and competition in his previous life - air guns.

The iron rod at one end of the yard was removed and replaced with a wooden target.

Hong Fan stood thirty meters away and flicked his thumb.

There was a bang.

The bullet was fired into the air, and it was immediately surrounded by fine sand on all sides, levitating in front of Hong Fan's shoulder.

More barren sand surged up, centering on it to form a two-meter-long barrel.

Hong Fan slowed his breathing, concentrated all his attention, and carefully adjusted the inner diameter of the barrel until five breaths later, reaching the limit of his current ability.

This is the most difficult micro-manipulation challenge he has faced since he got the sand world.

The light door and the front sight are formed separately.

The "receiver" slowly squirms, drawing compressed air repeatedly.

Yan Liujin finally intervened and roasted the sand body to 800 degrees Celsius.

At this time, the pressure inside the receiver reached two hundred atmospheres.

【Fire.】 】

Hong Fan's mind moved, and the sand body that had bitten the warhead suddenly relaxed.

There was no fire at the muzzle, only a thunderclap, much less than the movement of an instantaneous step.

A black shadow burst out and hit the left side of the target.

Hong Fan waved away a large stream of heat floating to his face and stepped forward to look at the target.

Hardwoods up to two inches thick were easily pierced, scattering a lot of wood chips.

The warhead is embedded in the rammed earth several meters away, and it is deformed to a considerable extent and can no longer be used.

After careful evaluation, Hong Fan returned to the stone table to record.

[1st test:

cast-iron bullets, weighing eight grams, with a barrel two meters long, unrifled;

muzzle velocity: 200 m/s (visual measurement);

Muzzle kinetic energy: about 160 joules ......]

The power of this shot was less than one-tenth that of the bullets of conventional rifles in previous lives.

The senses of the innate mid-stage martial artist are enough to catch a small object with a speed of 200 meters per second and react.

If you are taken by surprise, you may have a chance to hit, but the damage is far from enough.

But no matter what, the success of the first experiment still made Hong Fan very excited.

After that, the remaining nineteen bullets were used in turn, but the results were not satisfactory.

It takes at least fifteen seconds to shape the fine-tuning barrel, and it also takes time to get a "high-pressure cylinder".

So the air rifle in its current state does not have tactical significance at short and medium distances.

The problem is that after closing the distance, the accuracy is obviously insufficient - after fifty meters, it is no longer even possible to stably reach the target.

Twenty experiments, twenty improvements, and the problems summed up are clear.

The first is that the accuracy of the barrel is not enough.

The weathered sand is not fine enough, and the sand control ability is also insufficient, resulting in the inner diameter of the barrel is far from perfectly round, and it cannot fit the outer diameter of the warhead.

After each fire, Hong Fan could even vaguely feel the bullets colliding back and forth inside the barrel.

This is to be expected.

Barrel manufacturing has always been a challenge.

Even the German MG42 machine gun in World War II still used a polygonal barrel.

The second is that the bullet does not spin, and the trajectory is fluttering after discharge.

This is due to the absence of rifling.

Hong Fan doesn't know much about guns and is not a military fan.

But with his mathematical foundation, coupled with the few words he occasionally saw on the Internet in his previous life, it is not difficult to figure out the principle of rifling.

It is nothing more than to make a coaxial spiral on the barrel, so that the radius of the bullet is slightly larger than the yang line and slightly smaller than the negative line, so as to consume part of the kinetic energy when fired to increase rotation and obtain better flight stability.

The rest of the details—such as the shape of the rifling being rounded over square, reducing air leakage, and the fact that a smaller pitch reduces the muzzle velocity by more muzzle velocity, resulting in more rotational speed—are all things to come to mind.

But while the truth is simple, practice is a different story.

In the past, the cyclone separator could be further polished and corrected after casting, but now the sand barrel can only be formed in one piece.

If the accuracy of sand control cannot keep up, there is no other way.

Hong Fan made a summary and put the twenty bullets with different dead shapes back into the wooden box.

Then he shaped the barrel again and cast a bullet in fine sand in the receiver.

After raising the gun to the sky, after it was launched with a bang, it was vaguely visible that the bullet had traveled more than 20 meters and then scattered all over the sky.

Today, Hongfan's precise sand control range is 10 meters, and his influence can reach up to 20 meters.

After this distance, the sand world whip is beyond the reach of the whip, and the sand bomb naturally loses its shape.

This is the bigger problem besides precision.

If this killing method must be carried with a pre-processed metal bullet to be used, it will only be reduced to chicken ribs.

Hong Fan sat at the stone table and pondered silently.

When he was at a loss, he heard Taohong call him, saying that Wu Ruyi came to the door and was waiting in the front hall, as if he was in a hurry.

Hong Fan walked over quickly, only to know that it was Jian Siyuan who wanted to see him, and hurriedly rode his horse to the Zhangwu Academy.

In the general secretary's office, there is more than one person.

In addition to Mr. Jian's tiger in the middle hall, there are also Zhou Haoran, Wu Hongyan, Shi Yuanwei, and a strange secretary sitting on the side.

As soon as Hong Fan entered the door, he saw that everyone stopped talking and looked at him, and he felt that the atmosphere was solemn.

"Hong Fan, looking for you, I have something important to inquire about."

Jian Siyuan waved his hand to avoid etiquette and asked straight questions.

"I found out from the courtyard that you once created a Door One Rank Life Star Killing Method in Jinhai City, called 'Power Sand Wing'?"

"Is that the case?"

"It is true."

Hong Fan immediately replied.

When several people in the house heard this, their faces changed.

Zhou Haoran was nervous, while Wu Hongya, Shi Yuanwei and others were surprised.

"The text said that this killing method can help you fly to a thousand zhang high, and you can walk three hundred and twenty miles in an hour?"

Jian Siyuan asked again.

"Yes."

Hong Fan nodded again, and said it properly.

"At that time, I was just cultivating in one vein, and now I use this technique again, and I should be diligent."

"Okay, please come forward!"

Jian Siyuan praised and pushed the map out of the table.

"Eight hundred miles south of Xijing, forty miles northwest of Lezhang County, Qifeng Mountain."

"It's the beginning of Shen Shichu (three o'clock in the afternoon), you will leave at this time, when will you arrive?"

He figured it with his fingers.

"Counting the halfway break, it will be (eight o'clock in the evening) at the latest."

As soon as these words came out, Jian Siyuan breathed a sigh of relief, and Zhou Haoran was overjoyed.

PS: I haven't taken sleeping pills recently, and sleep mainly depends on fate, so the rhythm is a little abnormal.

In addition, I checked a lot of information, and all of a sudden it was a bit of a pig brain overload, and this chapter became more and more late.

In addition, add a setting that has not been mentioned, but should be taken for granted.

The power performance of ultra-remote sand control in the sand world varies at different scales.

Let's take a simple example.

It can set off a one-ton sand flow, which is only mediocre in terms of destructive effect, that is, the force of 10,000 newtons.

But if this force can be condensed on smaller objects without loss, the effect will be outrageous.

For example, a sand needle that is used to accelerate a gram can obtain an acceleration of 1 million meters per second, which is much higher than the acceleration of a typical rifle bullet.

Considering that the sand control range is much longer than the barrel of the gun, it will be directly secondary......

(PS was added after the release, not counting the money)

(End of chapter)