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The fire dragon sprayed onto the cold stone wall opposite, and the huge temperature difference quickly made the stone wall make a crackling explosion, and then after a while, the stone wall exploded, and the fine stone fragments fell off the cave wall.

Soon the person who was pressing the pressure pump was a little tired, and the fire dragon from the spray train gradually weakened, and then Charles Sman jumped out from the side and shouted a few words, the spray train is not breathing fire.

Immediately afterwards, two box cars similar to the spraying train were pushed up from the side, but this time the water that spewed out of this car, the icy water, poured on the hot stone wall that had been burned before, and the huge temperature difference made the stone wall explode again, and a large number of broken stone chips fell off the cave again.

Then dozens of people rushed over, shoveled these pieces of rubble with shovels, shoveled them onto the wooden cart next to them, and transported them out of the cave one by one.

The whole process seems to be very fast, and it is clear that these people have cooperated not many times before.

And Charlesman also saw Xiao Feng at this time, and immediately ran from the spray train to this side.

"When did you come back, Your Excellency?"

Charlesman was also very happy about Xiao Feng's return, Xiao Feng smiled and exchanged a few words of greeting with him, and then stared at the spray train in front of him carefully a few times.

The last time he was defending the city, he used a flamethrower, and the effect was very good, considering that this world happened to be rich in the fierce fire oil produced after the hybrid of local beans, Xiao Feng moved his mind to try to see if he could produce some flamethrowers in this world.

After all, compared with other weapons, this weapon is more lethal, whether it is defending the city or going out of the city to fight, this flamethrower is very powerful.

If you don't plan to equip the soldiers of this world with thermal weapons, equipping them with some flamethrowers is a very good choice.

Once the body is ignited, the only way to save oneself is to jump into a puddle of water, or bury it with soil to isolate the air, otherwise you can only be burned to death.

Therefore, Xiao Feng felt that this was a very effective weapon that enhanced the combat effectiveness of local soldiers, with sufficient raw materials and simple principles, so he handed it over to Charles Sman to be responsible for research.

Before he left, he probably explained the principle of the flamethrower to Charlesman, but he didn't expect this old boy to come up so quickly, and it seems that the effect is very good.

Charlesman also had a bit of a treasure offering, and specially explained to Xiao Feng the spray train he developed.

In fact, the flamethrower, in the modern world, first originated in ancient Greece in the 1st century, when the Greeks used the siphon principle, hoses and pistons to make the earliest flamethrower, and installed it on their station ship, and achieved a huge advantage in the naval war with the Arabs that year.

Later, in the 7th century, the Byzantines also used this 'Greek fire' in large quantities during the war with the Arabs, burning the Arab army of the time, thus carrying forward the flamethrower.

In ancient China, there was a precedent for the use of this flamethrower, but it was much later than the Europeans, and it was used extensively around 913 in the park during the warlords of the Northern and Southern Dynasties.

One of the most famous battles is the park in 919, in the war between Houliang and Houtang, the iron torch flamethrower appeared, the principle is very simple, and the current single-barrel push water gun is more similar.

It was not until the Song Dynasty that it was widely used in defending cities and water warfare, when the Song Dynasty people developed a fierce fire oil tank, using the mode of foot pressurization spray, at the beginning of the power was quite large.

But later it was also discovered that the shortcomings were not enough, because the air tightness was not enough, the pressure was not strong, and the farthest could only be sprayed five or six meters, so in the later war, it was abandoned.

And the kind of spray train invented by Charlesman in front of him, because of the unique natural conditions of this world, is much more powerful than the flamethrower developed by Xiao Feng in the ancient world.

In Xiao Feng's world, the flamethrowers invented in ancient times all faced an important problem, that is, the sealing was not enough, resulting in insufficient pressure that the pressure pump could provide, so the flamethrower was not far away.

Even if the flamethrowers used by the Byzantines were more advanced, they could only spray a dozen or twenty meters at the farthest.

In this case, knowing that the product of rubber came out in the later generations and a large number of machining processes appeared, the sealing problem of the pressure pump and the fire tank was solved, which made the effective range of the flamethrower greatly improved.

But even so, the farthest spray distance of a modern soldier's individual flamethrower is only 100 meters.

And Charlesman used the natural gum produced by a tree in this world to solve the sealing problem, and even used a tough rattan to make a hose, so that the range of the spray train he made was much longer than that of Xiao Feng's flamethrower made in ancient times.

Because there are some problems in the pressure pump that have not been solved, the distance of the injection is not too far, but it can also reach 34 meters away, which can be said to make Xiao Feng very surprised.

In this era, in terms of current technology, it is impossible to make this spray train smaller and more individual, but as long as the range of this spray train is increased, the effect is just as good.

If the range can reach 100 meters, then Xiao Feng can be bold and take the human soldiers out of the city to fight the orcs in the field.

Even if the orcs are strong, even if their archers are strong, the range of their bows and arrows is only one hundred to one hundred and fifty meters.

If the range of this spray train can reach 100 meters, and then he is equipped with a batch of iron can operators, Xiao Feng can perform a live barbecue for those orcs.

Imagine the scene of a hundred blast trains rushing in front of the orcs and spewing fire, that is, a tight fire blockade, and no orc should think of rushing in front of the human soldiers.

However, the problem of range is not something that can be solved in a while, and it also requires Charlesman to study the pressure pump and solve the problem of increasing pressure.

Xiao Feng also gave some solutions, such as whether the hand pressure pump can be changed to a foot pressure pump, so that the output of the person can be greater, and on the circulation machine of the pressure pump, can some pulleys be used to reduce the output of human physical strength.

After all, in the era when there were no hydraulic pumps, if you wanted to solve the problem of pressure, you could only use your brains in mechanical design.

Charlesman's suggestions to Xiao Feng have been recorded one by one, the great mage, every sentence can bring him inspiration, if it wasn't for the mage's earlier mention, how could he have built the current jet train?

Even if there are still many defects in the current spray trains, Xiao Feng is already very satisfied with these spray trains, although they do not meet the standards of field battles out of the city, but at least the defense of the city is still qualified.

With a spray distance of thirty-four meters, the next time an orc wants to climb the wall, it will be grilled into meat skewers by these spray trains.

"Your spray train is very good, I think it will be called a fierce fire oil tank in the future!"

"Thank you, Lord for your name!"

Of course, Xiao Feng prefers to name this spray train after the ancient Huaguo, which means the spread of civilization, and Charlesman will not refuse to give his invention a name to the mage, if he can defeat the orcs with the fierce fire oil tank in the future, it will mean that he has a chance to leave a name in history!

Coming out of the cave, Kayla led Xiao Feng to the right hand side of the castle, where there were several factories, two of which were the distribution of blacksmith shops opened by the dwarves, and one was a cement and concrete factory.

These are not the focus of Xiao Feng's attention, the third perfume specially held by the fox spirit Yuzao Xiuyi, and the Yurong liquid manufacturing workshop are the focus of his inspection this time.

Because this vixen is smoky and flattering, and the technique of seducing men is really powerful, Kayla came here to build a new city this time, and she really didn't feel at ease to leave her at the base, so she took her with her.

She also knew that Xiao Feng attached great importance to the jade liquid and perfume that this fox spirit could produce, so she opened a workshop for her here, and arranged more than a dozen subordinates for her to help her collect all kinds of raw materials needed to make perfume and jade essence.

And the female assistant who arranged for her was considered to be the one who prevented this vixen from death.

Of course, this vixen knew why Kayla was so protective of her, and if someone else treated her like this, I am afraid that with the natural unruly temper of the orcs, it would have exploded a long time ago.

But Kayla's status in this human tribe is not ordinary, and she is still the lover of the human archmage, so this vixen does not dare to make a mistake, so she can only obediently obey.

Xiao Feng's arrival made her very surprised, and she also took out the recently produced jade liquid and perfume as a gift to Xiao Feng.

Xiao Feng took a look at it, and the output was really a lot, the jade liquid, just a fifty-kilogram wooden barrel, filled two barrels, a full hundred kilograms.

There are more perfumes than this, filled with four large barrels, during this time, it can produce so much, Xiao Feng was very happy, and praised and encouraged this fox spirit a few words, and by the way, he rewarded her a lot, the drinks and sweets brought by the modern world.

These things are ordinary things in the modern world, but here, it is the top delicacy, and the vixen is also very happy to be able to receive such a reward, which means that Xiao Feng acknowledges her.

Even Kayla was jealous when she saw that Xiao Feng gave this vixen so many 'good things', and before Xiao Feng could say a few more words to this vixen, she pulled Xiao Feng out of the workshop.

This night, of course, is indispensable and lingering.

As soon as he got up the next morning, Xiao Feng received a letter from the carrier pigeon of the castle in the north, the content was very simple: the orcs are here again!