Small farmers dominate the deserted island

As long as the string is pulled to the maximum, every time it shoots an arrow, it will use the recoil of the bow to let the force receiving device below automatically wind the second string.

However, this can only be repeated three times, because after the third time, the crossbow will become extremely unstable and must be re-stringed.

As for the crossbow bolts of the crossbows, after Chen Yu saw the power of Qingyunwei on the Qingyun Plateau, the front of the whole crossbow bolts was made of stainless steel, and the front sprint was carried on it.

Once injected into the human body, the forward sprint can hook out all the human internal organs.

Of course, these are all external hardware, and the most important core part is the five gears, which are driven by steam.

The natives cannot help at all, because the gear error must be controlled within one millimeter, otherwise, the gear and the gear will not be able to bite, and the gear may collapse after time is out.

This is Chen Yu bit by bit, using the geometry, mathematics, physics, and other knowledge accumulated on the earth before.

From the early stage of making molds, making molten iron, grinding gears, and installing gears, Chen Yu handled everything.

His principle is to use the impact of steam to rotate a propeller-like thing, and then the propeller drives the pinions on both sides to rotate rapidly.

Every ten rotations of the pinion gear can drive the middle gear to make one rotation.

The middle gear rotates ten times, which can drive the big gear to rotate once.

Otherwise, just relying on steam to drive two gears at once is a idiot.

Chen Yu probably estimated that after the steam drive is completed, if it is fully activated, it should be able to travel for about 30 miles a day.

Chen Yu is very dissatisfied with this speed, because it is too cumbersome to travel 30 miles a day. Others can directly find a way to fix your desert tank in place when you start it, or use other means to deal with you. Of the desert tank.

The scale of the steam engine slowly expanded. Chen Yu changed from one steam engine to two, two to four, and four to eight.

After having eight steam engines, Chen Yu estimated that he could finally reach a speed of about 20 kilometers per hour. In this case, it is equivalent to a human jogging speed.

It's just that in the entire desert tank, one-third of the places are painted to place the steam engine. The desert tank that could hold more than 100 people can now only hold seven or eighty people.

Chen Yu originally wanted to consider removing part of the iron skin, but in this way, there would be no defense like tanks.

Now, it has been the first month since Chen Yu unified the oasis. After various efforts, he finally built the core steam engine of the desert tank.

Ideals are beautiful and reality is cruel.

Chen Yu discovered the problem for his first chicken wings steam engine.

First of all, the steam leaked. Chen Yu finally took a wire out of the wheelbarrow and made the lid into a twisting type.

But as a result, the steam could not be released, and the whole steam was blown up. If it weren't for Chen Yu's convenience at the time, he might have been blown to death on the spot.

Chen Yu closed his eyes and tried to remember the pressure cooker on the earth. It suddenly occurred to him that this kind of plateau equipment should have a vent valve. Otherwise, how can the vapor in it be vented when it is not in use?

So Chen Yu found a few pieces of wood and used some small accessories to make a high-pressure valve for venting. When the density of the steam reaches a certain limit, it will spray out by itself.

Once the steam is ejected, it proves that the steam inside has reached the point where it can activate gears.

After a day and night of hard work, Chen Yu solved the difficulty of the steam engine explosion.

Next, the most critical moment arrived, using the gas ejected by the steam engine to drive the sixteen-leaf spiral.

It is made of sixteen leaves that are similar to spoons, fixed on a large six-meter iron rod.

When the steam urges the leaves on it, the iron rod can spin up rapidly, driving the pinions on both sides.

"Master Chen, you, you are such a genius! Where did you learn this knowledge, can you teach me?" Touba now fell on his knees to Chen Yu's admiration.

As for the other indigenous people in the tribe, they obviously feel that Chen Yu is very powerful, but they don't understand what Chen Yu does.

Anyway, it's just a feeling of unawareness.

Chen Yu smiled slightly, lit the charcoal below, and waited for the water in the steam engine to turn into steam.

As the heat of charcoal is very high, and Chen Yu uses the principle of being enclosed on all sides under the steam engine, and no trace of heat is leaked out, so it burns very quickly.

In less than ten minutes, everyone heard the rumbling sound from the water tank, and the whole steam engine shook.

Chen Yu quickly pressed his hands back slightly, motioning everyone to back away.

After all, this thing is so powerful that it explodes, even if it is sprayed by the high-pressure steam inside, it can make people become mature in an instant.

After all, Chen Yu is also the first time to make this thing, and he does not have precise mechanical equipment. He does not have much confidence in his craft.

With the vibration of the water tank slowly becoming larger, and finally slowly becoming smaller.

Puff...oooooo...

A cloud of white steam directly broke through the high-pressure valve set by Chen Yu, and directly rushed to a height of more than ten meters, which shows how strong the air pressure inside.

After doing this, Chen Yu said to Tuba in fear, "Go, open that steam port."

Touba felt his Jube tightened and looked at Chen Yu warily.

Just kidding, this thing is too powerful, what if there is an accident when opening the steam vent?

But Chen Yu is now his idol, and he has to bite the bullet.

Touba first found a shield to protect his upper body, then slowly walked to the side of the steam engine, grabbed the pull ring of the steam port with one hand, closed his eyes and pulled hard.

boom......

The steam from the steam vent shot out like a gun, and the sixteen leaves that were hit directly spun quickly.

The sixteen leaves were spinning, the iron rod was spinning, and then the pinion was spinning rapidly.

Chen Yuchang breathed a sigh of relief and wiped the cold sweat from his forehead.

At this time, Touba was already sitting on the ground. The loud noise just now scared him out of his mind.

Chen Yu roughly calculated that the rotation speed of this pinion should have reached fifty revolutions per second, and it flew fast.

In other words, the pinion can drive the middle gear to rotate five times per second.

Then, ten revolutions of the middle gear can drive sixteen wheels to make one revolution, that is, within two seconds, the wheels will make one revolution.