Lin Xiuxian smiled, "This thing is not easy to get, it just so happened that some time ago, a knight came back from the Earth Metaverse, and only then did he find a small part in the Earth Metaverse and bring it back, and store it in a friend of mine where to sell it, you can see if it is enough!" ”

Lin Xiuxian said, and handed over the lead cylinder.

Zhang Tie took the lead cylinder, and as soon as he unscrewed it, a fist-sized golden crystal floated out of the lottery at once, like a balloon breaking free from a child's hand, floating directly to the ceiling.

"Be careful, this thing is really going to float away, and I don't have ...... way," Lin Xiuxian hurriedly reminded.

Zhang Tie nodded, pinched the fist-sized crystal with his hand, and looked at it seriously.

The fist-sized crystal is like a combination of gold and crystal, both with the texture and luster of metal, but also with a translucent color, and what is even more amazing is that as long as this thing is loosened, it will float away, even if it is held at the moment, Zhang Tie can still feel its power that is eager to break free of his palm.

This is metal, the most expensive and mysterious metal in the world today, the raw material for the core components of the Taixia royal family to make the flying boat - empty floating gold.

Even Zhang Tie saw for the first time what the raw ore of empty floating gold looked like.

"How many more are in the barrel?"

"There are 7 more of the same size!"

"Okay, thank you......" Zhang Tie said, unscrewed the lead cylinder, re-stuffed the empty floating gold that was about to float away, and then took the lead cylinder and put it directly into a space ring on his hand, which was strange to say. The floating gold that was struggling to fly away in his hand was honest as soon as he put it in the lead barrel. It's just quietly suspended.

Then Zhang Tie directly took out fourteen Earth Yuan Crystals from the space ring he was wearing on his hand and pushed them in front of Lin Xiuxian.

The process. Lin Xiuxian and Zhu Daqian unabashedly looked at the space ring on Zhang Tie's hand with amazing eyes, watching Zhang Tie take things out of the space ring and put them in again, just like a trick.

For the knights, the space equipment is rare, and for these rune alchemists, it is even more remarkable, since Zhang Tie first revealed the space ring on his hand in front of the two people, he has stopped the two people.

"Grandma's, when I wait for the future, Lao Tzu will make a fortune. Become a craftsman, Lao Tzu also got a portable space equipment to wear ......" Lin Xiuxian said, his hand was not slow, but hurriedly took out the earth element crystals that Zhang Tie took out into a storage bag he carried, presumably the space ring, these elemental crystals are also eye-catching.

"If you want to become a craftsman, then you don't know that you have to wait until the Year of the Monkey and the month of the horse, but if you actually want to do it, it is better for us to save enough Diyuan Crystal. When to go to Taiyi City to try your luck with two Vault Pearls! Zhu Daqian also glanced at the space ring on Zhang Tie's hand twice, and then said.

"The space ring on your hand is too much of an eyesore, it doesn't matter if you are in Tiangong City, if you want to leave the city. Be careful, this thing, the knight is red-eyed when he sees it. You're a tenth-level strong warrior, and others rob you of your things. Even the eyelids of the destruction of corpses will not blink, and the human heart is like a demon. That's the same thing as the demons, your space equipment is to make people enchant! Lin Xiuxian, who put away the Earth Yuan Crystal, also reminded Zhang Tie.

"Thank you Brother Lin for reminding me, I know, I can also use a little cross-dressing skills, if I go outside, I will protect myself!" Zhang Tie smiled faintly and said, "It's just this empty floating gold, I don't know if Brother Lin has a way to get a little more, the price is easy to say!" ”

"This empty floating gold is a product of the Earth Metaverse, the largest empty floating gold mine in the Earth Metaverse is in the hands of the Taixia royal family, except for the Taixia royal family, where can other people have channels to obtain a large amount of empty floating gold, just I just brought these, or a knight was lucky enough to dig it in the mine of the Earth Metaverse, and in addition to the Taixia royal family, it is not much use for ordinary people to take this empty floating gold, and the secret method of making flying boats with empty floating gold is in the hands of the Taixia royal family!" Lin Xiuxian glanced at Zhang Tie seriously, "For us rune refiners, the rune compatibility of this empty floating gold is too poor, and it can't be fused with other metals, even if you barely make a set of empty floating gold equipment, you can't use it, wearing it on your body is like flying a kite, how you move it is not up to you, in the past, there were also rune refiners in Tiangong City who made a pair of winged equipment with empty floating gold, and they made it on their bodies, which looked majestic, but in the end, because it was not easy to control the direction in the sky, That rune refiner almost didn't fall to his death, what do you want so much floating gold for......"

"To tell you the truth, I am planning to design a new set of steam centrifugal cannons recently, and now the heat and durability of the spindle bearings of the steam centrifugal cannons are a big problem when they are running at high speeds, and I am going to collect some air floating gold to make a set of air floating gold suspension bearings that can carry high speeds, zero wear and high durability...... " Zhang Tie said as he started drawing on the table top of the table where several people were drinking.

This bar is a bar dedicated to rune refiners gathering, and it is common for rune refiners to discuss various armed equipment and design drawings when they get together, so the table top here is a magnetic rune drawing platform, and whoever is inspired can draw the things in their heads on the table at any time, so that the people around them can discuss together.

Zhang Tie drew on the table the simple design concept of the steam centrifugal cannon he had conceived.

Although the things on the desktop were drawn by Zhang Tie casually, as the basic skill of a rune refiner, the things drawn by Zhang Tie casually were like drawings made by other designers with drawing tools such as rulers and compasses, the line segments were straight without a little wrinkles, and the circle was so round that people couldn't find the slightest fault, but in less than a minute, Zhang Tie drew a rough sketch of the design of the steam centrifugal cannon on the desktop, and wrote the approximate parameter symbols.

Lin Xiuxian and Zhu Daqian looked at the image drawn by Zhang Tie seriously, and the two of them frowned and thought while looking at it, and after a long time, Zhu Daqian touched his chin and asked Zhang Tie directly, "Your design is a bit interesting." I see that the main turntable of your steam centrifugal gun is closer to the traditional energy storage flywheel design, which must allow the flywheel to run in a vacuum. The energy loss during the flywheel operation is minimized, and the non-contact suspension main bearing is used. Although this can make the speed of the flywheel reach the maximum value, so that the speed of the shot ammunition increases a lot, but the investment has also increased many times, especially the suspension of the main bearing to use empty floating gold material, from the scale of input and output is completely uneconomical, there is effort and time to make this thing, ordinary steam centrifugal cannons can make more than ten, the strike effect is several times that of this, do you want to use this thing to participate in the annual steam centrifugal range competition held by the Rune Refinezer Guild......" Speaking of which. Zhu Daqian looked at Zhang Tie seriously, and then shook his head, "It shouldn't be, that kind of competition is all participated in by rune refiners below the secret talisman master, Lao Tie, you still need to join in such a lively ......"

"No......" Lin Xiuxian's eyes suddenly flashed, "Lao Tie, you still have a hand, here is ......" Lin Xiuxian's hand also clicked on the desktop drawing drawn by Zhang Tie, "Lao Tie, you seem to have left something here, and you haven't drawn it......"

Zhang Tie sighed secretly in his heart. Sure enough, it is worthy of being an old bird who has been in Tiangong City for decades, and this insight is really extraordinary, just looking at the rough sketch in front of him, the interface of a functional module reserved on the sketch has been seen.

Now that Lin Xiuxian has seen it. Then Zhang Tie had nothing to hide, so he simply moved again, right where Lin Xiuxian's finger pointed. Drew an object and added a generic symbol for rune refiner communication.

"High-speed empty floating gold vacuum flywheel centrifuge disc. Plus an explosive high-pressure steam propulsion valve, this thing. Even if the cost is very high, it should be enough to kill a master at the level of the war spirit, but even if you want to kill the war spirit, it seems to be making a little fuss......" Lin Xiuxian suddenly looked at Zhang Tie with wide eyes, "Do you also want to make a steam centrifugal cannon that can kill the knight, Lao Tie?" ”

Zhang Tie rubbed his face, "What do you mean?" ”

"Because of a similar design, I had seen it decades ago, it was designed by my master, but it didn't work out in the end!" Lin Xiuxian sighed, stretched out his hand and perfected it on Zhang Tie's sketch, "At that time, I was still young, my master was already a master craftsman, and at that time he also had an ambition, wanting to make equipment and weapons that could kill knights, in the end, he chose the steam centrifugal cannon as a breakthrough, at that time, my master chose the steam centrifugal cannon with a flywheel structure, at that time, my master's idea was that the maximum speed of the flywheel could reach 200,000 revolutions per minute, if a flywheel with a diameter of several hundred meters could be made, then, When the speed of such a flywheel reaches 200,000 revolutions per minute, the linear velocity of the edge of the flywheel will likely reach a terrifying level, and anything thrown out of the flywheel at this speed will have a huge kinetic energy, and when this huge kinetic energy reaches a certain level, it can kill the knight, but ......"

"But did your master finally discover that the mechanical linear velocity of any flywheel edge can only be below the speed of sound at the maximum, which can be infinitely close, but it is impossible to exceed, the theoretical speed of the flywheel of 200,000 revolutions is only limited to the small diameter flywheel in the vacuum, once the flywheel is directly amplified, its physical limit will come!" Zhang Tie smiled bitterly and said.

"Yes, that's right, and then my master thought of a way, that is, at the moment when the shell of the steam centrifugal cannon leaves the flywheel turntable, give it a boost, that is, add an explosive high-pressure steam propulsion valve at this position, but even so, after working hard for this for 20 years, the best result that my master can finally achieve is to make the muzzle velocity of the cannonball reach about 1700 meters per second, which is only equivalent to five times the speed of sound. But still can't kill the knight......"

"And then?"

Lin Xiuxian pursed his lips, his eyes reddened, "That old thing was unwilling, and finally thought of a way, he actually abandoned the design of the explosive high-pressure steam propulsion valve, and wanted to use the explosion of the pure alchemy bomb to increase the muzzle velocity of the steam centrifugal cannon. Lin Xiuxian looked at Zhang Tie and said very seriously, "Lao Tie, I know that you are not short of money, but on this road, many extremely talented rune refiners want to go, and they all want to leave their names in history and make themselves the pinnacle of the human rune refiners." But no one succeeded......"

Zhang Tie knew that Lin Xiuxian was telling the truth, because of what he said. It was the results that Zhang Tie himself had obtained in the laboratory and in the Black Iron Fort in the past two months, that the maximum speed of the mechanical linear velocity at the edge of the flywheel of the steam centrifugal cannon could only be infinitely close to 340 meters per second. It cannot be surpassed, and the speed increase exerted by the explosive high-pressure steam propulsion valve is limited by the power of the steam explosion, and the maximum muzzle velocity of the projectile can only be less than 2,000 meters per second.

"I'd like to try it anyway, maybe there's another way!"

"There are two ways, either to make the mechanical linear velocity of the flywheel break through the speed of sound, or to exert more power to the shells of the steam centrifugal cannon, but the limit of the power that steam can reach can already be seen, and the alchemy bomb is not reliable at all. Its reaction was too violent, and it killed its own people before it could kill the enemy......"

"Steam and alchemy bombs aren't the only way!"

"You're right, my master had a great understanding before he died, he said that maybe someone could increase the muzzle velocity of the cannonball of the steam centrifugal cannon or break through the maximum mechanical linear velocity of the flywheel in the form of a rune array, but mastering the rune array is the top skill of the rune refiner, and the entire Taixia rune refiner level can be counted in two slaps. What's more, of all the runes that rune refiners can use now, not a single rune can increase the speed of inanimate objects, and now the rune refiner guild spends a lot of effort in the Earth Metaverse every year. I wanted to find such an ancient rune from the Earth Metaverse, but I never found anything, and I even doubt that it was in the ancient era. Is there such a rune in the end, Lao Tie wants to take this road. It's going to be very, very difficult ......."

"I know it's going to be very, very difficult, but there's at least two ways to go ahead. If I don't try, I'm a little unwilling, even if I do my best, let it be fate! Zhang Tie also sighed.

In the past two months, after repeated attempts and failures, the obsession in Zhang Tie's heart has not changed, but he knows better what kind of road he is facing, if this road is really so easy to walk, to be honest, I am afraid that it has been walked countless times by others, and it is not Zhang Tie's turn to try it now.

"Then I can only wish you good luck, I will leave Tiangong City in a few days, to Yunzhou, Yunzhou City's Hongshengtang Meng family is going to build a Grade A city, I have a little friendship with an elder of the Meng family, he invited me to preside over the setting of the city defense system of the Mengjia City, and opened a reward of 1 million gold coins, I also earn some pocket money for myself, and today I can say ......goodbye to the two of you."

Zhu Daqian also smiled bitterly, "You also took the job?" I may be going to report to Bingzhou City in two days! ”

"What's the matter with you?"

"Didn't I tinker with the design of a small nitrogen separator before, and I myself have a little experience in separating nitrogen from the air, I originally thought that this thing was not very useful, but I didn't expect that yesterday an official who commissioned the general to travel to Tiangong City and invited me to a military factory in Huanzhou to participate in the design of a weapons project......

didn't expect that Zhu Daqian's matter was still related to himself, Zhang Tie could only sigh that the world was too small, the person who came to find Zhu Daqian was naturally not arranged by himself, it was estimated that it was Lu Yanyu's subordinates, at this time, Zhang Tie didn't know what to say.

"What weapons project?"

"The Spitfire tank that uses candle oil, I'm in charge of the nitrogen liquefaction part of the tank!"

"Spitfire?" Lin Xiuxian was obviously shocked, but Zhang Tie was at ease, because this was already in his expectation, when the Candle Dragon Leader took out those candle oil weapons, he thought of the strength and strength of Etherxia, and naturally he would find a way to create a more powerful weapon, he was just the beginning.

"Of course, if you look at the situation in several states in the war zone now, everywhere is in full swing, candle oil production bases are being built, and this field is full of fermentation tanks and earthworm feeding ponds of the earth of thousands of real people, this scene is even more lively than when there is no war, this thousand real people are really unpredictable, the original states are still gloomy and miserable, he has only taken over as the general of the commission for a few months, and the civil decline in the four states of Kangning has almost been swept away, and the people, wealthy families, officials, all enthusiastic, Even many factories in this Tiangong City have begun to study candle oil weapons, no wonder such a person can be selected by Da Sima An as the general of the commission! Zhu Daqian said with reverence.

"Ahem, Qianji Zhenren may just be a little lucky, I heard that person is still young and doesn't understand anything!" Zhang Tie coughed twice and said.

"Hahaha, Lao Tie, we all know that you are high-spirited, but this Qianji real person is indeed a true heroic husband, affectionate and righteous, and his merits and reputation are really not something that you and I can look up to, I heard that he also has an Iron Dragon Sect in Youzhou, when you didn't come last year, Lao Zhu and I were discussing, if we are tired of staying in this Tiangong City, it is better to go to Youzhou to go to the Iron Dragon Sect to eat a bowl of rice, with our ability, it is estimated that we will not be turned away...... Lin Xiuxian laughed and said.

"With the skills of the two elder brothers, if you really want to reach the Iron Dragon Sect, that Qianji real person will definitely open a hall for the two elder brothers, and let the two elder brothers be in charge!" Zhang Tie also smiled.

"Hahaha, then thank Lao Tie for your auspicious words, by the way, how long do you have to stay in Tiangong City, if you stay for a long time, I will introduce a few friends to you in two days......

"I'm almost leaving Tiangong City, this time I came to Tiangong City for more than two months, I have gained a lot, some things are really not in a hurry, I can only slowly and gradually find a way, the current world is getting more and more chaotic, if the thing I said is not there for the time being, I want to improve my strength first, cultivate seriously for a period of time, and strive to advance to the next level as soon as possible, it is not a bad thing!"

This time he came to Tiangong City and stayed in Tiangong City for two months, Zhang Tie's biggest gain was to understand what the difficulties and obstacles to overcome to realize his idea were, which could not be solved in one day, or even his current rune refining level.

There is no need for him in the rear now, all aspects have basically been properly arranged, everything is in order, and there will be no big mistakes, so Zhang Tie wants to go deep into the war zone alone, not for anything else, it matters if he advances to the Phantom Knight first, what kind of commission general, in Zhang Tie's opinion, it is all a false name, others can give it to you today, and you can naturally take it tomorrow, a little vanity in the officialdom is really nothing to Zhang Tie, and Meng Shidao, who swallowed the party, is still eyeing Xuanyuan Hill, so Zhang Tie doesn't want to get involved in Taixia's officialdom too deeply, which is not a good thing for him.

For a knight, strength and rank are the biggest reliance, this time deep into the war zone, the worst, you can also kill a few more demon knights, or give the demon clan and Tongtian Sect a little trick-making, to relieve a little pressure for the rear, these two months, the situation in the war zone, although Taixia has eased, but still not optimistic, as a knight Zhang Tie is really difficult to be idle at this time...... (To be continued.) )