Nowadays, Binh Duong's high-speed operation workshop is like a large factory, which has become an important support for FID, providing not only a large number of ordinary equipment, but also special products for FID.

With iron ore, raw materials are not a problem, and with Huang's craftsmen, after many experiments and debugging, the improvement based on the bronze crossbow is finally completed.

What is now in the hands of Fei Qian is basically a stereotyped sample.

Huang Dou, who sent the crossbow machine over, has lost a lot of weight, and his body, which was originally like a leather ball, has gradually changed to a muscular appearance, just like the women of Russia in later generations, just like two people before and after marriage, but Huang Dou is developing upside down.

Because the crossbow machine is a military system and is ready for mass production, it is not very particular about some details of carving, without any patterns, without superfluous decoration, pure and simple structure, the purpose is to kill people better and more conveniently.

It is said to be an iron crossbow, but it is not actually made entirely of iron.

The crossbow box is changed to iron, and the missing part of the hanging knife of the crossbow machine Wangshan is still bronze. No way, now in this stage of the Han Dynasty, the advantage of bronze in infusion is still much stronger than that of black iron, and the poured bronze can directly have enough strength and toughness, but black iron must be fried again to have the characteristics of toughness, and it takes too much manpower to beat the steel of thirty or fifty refining into parts such as hanging knives.

There are still wooden supports or something, and these surrounding things have basically not changed, but they are reinforced with iron hoops, so that they can be less damaged in the actual operation process.

One of the biggest changes was the crossbow arm, which was replaced by a bakelite structure and steel.

But the steel string, although Fei Qian's idea was very good, failed in the end.

This crossbow machine, hanging on the crossbow arm, is a bowstring made of a mixture of hair, linen, and silk.

Huang Dou said on the side: "Although the wire is good, but when the bow is opened about 20 times, it will be stretched and must be readjusted, and then like this, it must be replaced after three adjustments, otherwise it will be very easy to break...... That is, according to the current process of the Han Dynasty, the iron wire produced will be at risk of breaking and damage after 60 shots.

Regarding this, Fei Qian is also helpless.

Originally, in Fei Qian's thoughts, the bowstring should be similar to the bicycle brake line in later generations, which was twisted together by multiple strands of extremely thin steel wires, but now the craftsmanship of the Han Dynasty really can't meet such requirements......

Even if Fei Qian borrowed the skills of water power and lever to pull the wire, the material limitations still made Fei Qian unable to do anything. If you want to pull out a thinner, but not easy to break the iron wire, you must require the steel to have stronger toughness, which in turn requires the steel to be forged and smelted again, and the steel that has been forged many times in turn increases the difficulty of wire drawing, so it falls into a dead loop.

Coupled with the high labor and high cost required, it is in fundamental conflict with Fidgen's original idea of simplicity and easy replacement.

However, the wire pulled out of ordinary car materials is not completely useless......

Now the cost of making steel crossbow arms is relatively low compared to before, after all, the gap between the difficulty of making iron sheets and iron wires is still very large. Because of the realization of the hydraulic forging equipment of the variable speed gear, it is easier and easier for Feiqian to obtain 30 or even 50 refining steel than before.

Driven by the constant flow of water, the hammering machine that runs back and forth, as long as the hammer arm is not damaged, can even be struck with the same strength 24 hours a day, so that Fei Qian can more easily obtain higher quality steel, resulting in the double-layer steel crossbow arm used in the crossbow machine.

Huang Dou said: "The outer layer used in the crossbow arm is thirty refining, which is harder, and the inner layer is fifty refining, which will be tougher, so it is better than using thirty or fifty alone, two hundred and fifty steps away can penetrate the armor, and three hundred and fifty steps away can also enter the wood by an inch......"

In this way, it can still be lethal to unarmored targets at a distance of 350 paces, which is more than double the range of a bow......

The effective range and the maximum range are completely two concepts, and the so-called strong crossbow cannot wear Lu Min at the end, which is what it says. Because of the resistance of the air, the power of the arrow and the crossbow drop very quickly in the final stage of the flight, even if it is projectile, it is only the damage caused by the gravity of the arrow itself, and the force when it is off the string is definitely not comparable.

Fei Qian looked at the crossbow arm, the malleability and toughness of the steel were perfectly displayed at this moment, the slightly curved crossbow arm is like a crescent, and the dark surface seems to have been burned and rust controlled, which is the most valuable thing about the whole new crossbow machine.

Crossbows, because of the crossbow arm, it is impossible to make the same length as the bow, and the crossbow arm of the traditional bakelite structure, because it is short, so it is natural to choose a better elastic bowstring on the crossbow string, and a higher bowstring is required to increase the power.

Just like the rhubarb crossbow in the early Han Dynasty, not only the crossbow arm is longer than that of ordinary crossbow machines, but even the crossbow string has special requirements.

Now, steel is strong enough to compensate for the short arm and lost range, and at only two-thirds the weight of the rhubarb, it can provide a power comparable to that of the rhubarb.

It's just that this causes the upper string to still need to be stretched, alas, Fei Qian sighed slightly.

It is estimated that the compound pulley bowstring could not be made in the Han Dynasty, so that the crossbow can only be used for infantry, as for the cavalry, the hand crossbow is still too complicated, and there are a lot of things involved, and it can't be lit for a while......

But this is enough, the bow of the cavalry, the crossbow of the foot soldier, can form an effective strike surface on the battlefield, especially the crossbow, which has a huge advantage over the bow and arrow in ultra-long range and charge standby, and more importantly, as long as the crossbow machine is sufficient, Fei Qian can change all the foot soldiers into ordinary part-time crossbowmen.

And to produce an archer, it is impossible without long training.

So now the problem is production and cost.

"There are now 300 bodies, and by the beginning of spring next year, it is expected to reach 8......00 bodies," Huang Dou said, "mainly because the weather has been cold recently, and the wood used for the wooden support of the crossbow machine is not easy to dry out......

Fei Qian nodded, eight hundred plus more than a hundred crossbows originally existed, there can basically be a thousand strong crossbows, so it can be considered more or less enough......