"Childe, according to your instructions, this big ratchet is three feet in diameter...... Oh no, a whole meter! ”

Wang Denghai pointed to a four-spoke gear on the ground and introduced it to Chu Fan, but he was still thinking about this long-standing question in his heart: What is this "rice"? How does the food have anything to do with the length?

After returning from Jingyi County, Chu Fan further promoted standardization: the length was all unified into meters, and the stone standard ruler of 1 meter was made by adding an inch to the original three feet - as for whether this length was equivalent to 1 meter in later generations, it was no longer important, the focus was on standardization - under 1 meter, it was divided into decimeters, centimeters and millimeters.

After this rectification, the accuracy of the vernier caliper reached 0.2 mm, and Chu Fan also promulgated the current length tolerance range of 0.5 mm to all craftsmen.

The length was adjusted, and the other weights and measures were adjusted accordingly: weight, for example, was made from 1 cubic decimeter of water as 1 kilogram, and the corresponding stone standard was made by the same method of equalization - further down it was impossible to distinguish between the instrument and the instrument - and the tolerance range of the weight was set at 1 decimeter.

The volume is also drawn according to the gourd, and the liters and milliliters are divided, and the tolerance is 1 milliliter.

Chu Fan listened to Wang Denghai's introduction, and measured the four-spoke gear with a newly made ruler, indeed the diameter of the big wheel is 1 meter, and there are a total of four spokes on the big wheel from the shaft to the wheel, and the width of each spoke is 1 decimeter, which is the size he gave Wang Denghai.

This four-spoke gear is the core component of Chu Fan's transformation of the ballista, and the other core component is a section of the internal gear of the large wheel that is 10 times the diameter of the large wheel, which is used to pull the bowstring; Another core component is a pinion with a diameter of 0.33 meters - a rocker arm at each end of the shaft of the gear.

The entire unit is cast in bronze and then polished smooth so that the gears can be engaged.

After inspecting all the parts, Chu Fan took matters into his own hands and installed the whole set of devices with Wang Denghai and the crossbow masters from Nanjing. Equipped with a crossbow arm and bowstring.

"Shen Teng! Come on, wind with me. After loading, Chu Fan called Shen Teng over, and as soon as the latter heard the stringing, his face became bitter.

In the battle to rescue Yang Tiansheng, he was tortured by this string - the bowstring of the bed crossbow was extremely powerful. Usually four strong men have to exert the strength of milk to fill the string; Moreover, a group of people had to rest for a long time after the last string before they could go on the second time, and fortunately there were many people on the "Dawn" at that time, otherwise there would have been such a fast rate of fire.

Later, both the men on board and the guards hated winding the bed crossbow - where it was wound, the whole thing was torture!

Now Shen Teng heard that Chu Fan asked him to wind up, and he was ten thousand unhappy in his heart, but he didn't dare to show it, so he walked to the bed crossbow and asked in surprise. "Childe, just the two of us?"

"That's right!" Chu Fan nodded confidently, held the rocker arm on his side, raised his chin at the swingarm opposite, and motioned Shen Teng to do the same.

Shen Teng suspiciously followed Chu Fan's example and held his rocker arm, and shouted angrily like before, "Go!" ”

He exerted too much force, but the rocker arm was exceptionally light. As a result, after he shook half a circle, the whole person fell to the ground!

Before the onlookers could react, he had already jumped up. Staring at the rocker arm in surprise, he shouted, "Why are you so brisk?" Is this really winding? ”

Chu Fan couldn't help but purse his lips and smile when he saw him so excited-just kidding, it saved 30 times the effort, it's strange if it's not light!

After speaking, Shen Teng held the rocker arm again, now he has experience, and cooperated with Chu Fan to quickly turn the rocker arm. As the big wheel slowly turned, the internal gear slowly moved, and the bowstring that pulled the bed crossbow slowly moved back.

After shaking for almost two minutes, the bowstring was already in place, after a "click". The crossbow machine fell, and the entire upper winding was successfully completed.

"Oh my God! Is this on the line? I didn't even make any effort! Shen Teng stared at the wide-open crossbow arm with round eyes and shouted incredulously.

Chu Fan didn't pay attention to him anymore, but called the crossbow master who was also dumbfounded, and asked if he could still increase the string force - after he tried it, he felt that it was indeed as Shen Teng said, it was too easy!

This means that the potential of the crossbow arm and bowstring can also be exploited, and the string force can be increased, which in turn will increase the range.

"Hui Gongzi, if you want to strengthen again, it is the eight-cow crossbow, that is, the three-bow bed crossbow," the master surnamed Lan thought for a while and said, "I have followed my master to make this crossbow, but this crossbow is extremely difficult to wind, the so-called eight cows are not a lie, it really takes a few cows to pull it open, and it is no longer used in the army......"

Speaking of this, he turned his head to look at the winding device, his eyes gradually lit up, and he nodded, "Okay! Childe, just wait to see my eight-bull crossbow! ”

Eight Bull Crossbows!

This familiar term made Chu Fan ecstatic at once - as a bookworm at some point, he certainly hadn't seen the description of this powerful and perverted weapon; In many books, the "one arrow and three guns and arrows" fired by the eight-bull crossbow are siege weapons, and the arrows can be directly inserted into the rammed earth city wall and used as a ladder on the wall, which shows its great power!

The power is strong, so the range is long, it is said that the maximum range of the Eight Bull Crossbow can reach eight or nine hundred steps, which is more than a thousand meters!

The speed of his own ship has an advantage, and if there is an eight-ox crossbow that can shoot a thousand kilometers away, then even if it encounters a Dutch warship equipped with a twenty-four-pound gun, it will have the strength to fight! Not to mention the Chinese sailing ships with much less powerful artillery fire, when encountered, there are two words: crush!

On the way to the weapons group, Chu Fan thought about how his fleet would run rampant in the East China Sea in the future.

When I arrived at the weapons group, I saw that inside the huge workshop, the craftsmen were either disassembling the Lumi guns, making parts, or assembling the flintlock devices, and they were very busy -- now the weapons team can renovate five or six Lumi guns every day, and it can complete the refitting of a sentry in a month.

Chu Fan didn't come to transform Lu Mi Gong, he was thinking about another thing.

That's homemade firecrackers!

There are only 400 Lumi guns, plus those damaged in previous battles, which is enough for the equipment of two outposts; Besides, although the actual combat has proved that the Lu Mi Gong is quite reliable, it also has an obvious flaw, that is, the body is too long!

Measured with a new ruler, the total length of the Lumi gun is more than 1.8 meters, of which the gun pipe has reached nearly 1.6 meters!

Chu Fan had seen some relevant records in his previous life, and in the eyes of the craftsmen of this era, the longer the length of the firearm, the greater the thrust of the gun*, and the longer the range; Of course, Chu Fan knew that this was a misunderstanding, so when he decided to make his own firecracker, he would definitely not make such a mistake again.

But the specific length of the barrel is appropriate, which made Chu Fan think about it for a long time, and finally he decided to set the length of the barrel at 1.2 meters, plus the butt and an integrated bayonet, the length of the whole gun should be between 1.5 and 1.6 meters, whether it is carrying or hand-to-hand combat, it is quite suitable.

In addition, in addition to the spear as the main battle weapon, Chu Fan also decided to make a short fire gun with a barrel length of 20 centimeters and a full gun length of 30 centimeters, flint hair, so that it could be used in close combat.

In addition to the body of the gun, Chu Fan is also ready to carry out a drastic transformation of the bullet - the round lead in the past should be eliminated.

How to change it, Chu Fan already had a general idea, but when he told Sun Hedou and Tang Jiniu about this idea, the two of them invariably showed puzzled expressions.

"This ...... Will it work? (To be continued.) )