Bright Sword starts with the grenade flat.

Chapter 383 The Importance of Bow Limb Materials

So at once, a lot of Na'vi people came to the front of the spaceship where Liu Xiu lived, and they all asked to buy a good bow. You know, not everyone in the Na'vi tribe knows how to make a bow.

Especially if you want to make a good bow, you must seek help from the bow-making experts in the tribe. For example, the bow in the hands of Jack's wife Neytiri's father is also a traditional bow, but it is more powerful than the bows in the hands of ordinary tribal members because the production techniques are different and the wood used is also different.

However, no matter what a group of natives did, they could not surpass the composite pulley bow made by Liu Xiu, because in addition to the labor-saving and speed-increasing pulley design, the more important thing was that Liu Xiu used carbon nanotubes for the bow limbs. This fifth-generation material for making bow limbs allowed the composite pulley bow to achieve such performance.

You should know that whether it is a compound bow, a recurve bow, or a crossbow, in addition to its own material and structural mechanics design, the main factor determining its performance parameters is the material of the bow limb! The bow limb is the core of the entire powertrain, equivalent to the engine of a car!
The bowstring is a power transmission system, equivalent to the gearbox of a car, and its materials and classifications are also very different!
Of course, if a car's engine is not good, no matter how powerful the gearbox is, it can't help. So the core of a bow is still the bow limbs, and bow limbs are also classified into many categories according to their quality! The quality level of a bow can be basically judged by the classification of bow limb materials!
Of course, bows have appeared in the history of Wandering Blue Star for thousands of years. The earliest bow pieces were naturally made of wood or bamboo, which were the materials of the first generation of bow pieces.

Then there are the second generation of bow pieces. This type of bow piece is made of the most common and cheapest steel piece! The material of this type of bow piece is extremely cheap steel plate or even iron plate. It is heavy and has poor rebound performance! The anti-fatigue performance is even worse. Generally, after using it for a period of time, you can obviously feel the significant decrease in tension and elasticity! The market price of this type of bow in the world before Liu Xiu traveled through time generally ranged from a few hundred to thousands of yuan! However, it generally does not exceed 800 yuan. The performance of the bow is actually not much different from that of the ancient wooden bow, it is just a little better.

The third generation of bow limbs, this type of bow limb is the fiberglass bow limb! That is, the epoxy resin limb. This type of bow limb is more advanced than the cheapest steel limb! It is light in weight, has good rebound performance, and good fatigue resistance!
Under the same structure and size, the power of the bow is nearly twice as strong! It can be seen that the performance and durability of epoxy resin sheets are one level stronger than steel sheets! However, this type of bow is also the lowest and cheapest.

Next is the fourth generation of bow limbs, which are the top-level and most expensive bow limbs in the world before Liu Xiu traveled through time. What is special about this type of bow limbs is that they are carbon-coated!
The technical feature of this bow is that the carbon fiber is sandwiched between two layers of glass fiber and baked! Its feature is that it can obtain greater pulling force under the premise of the same thickness! The performance is improved by 15 to 20%, and it can be made thinner under the premise of the same pulling force! The role of thinner is to exchange for a longer service life!

However, after the Wandering Blue Star world where Liu Xiu was located developed carbon nanotubes in order to improve space transportation capacity, the performance of this material was more than one level higher than that of carbon fiber.

Its tensile strength is hundreds of times higher than that of ordinary steel, so Liu Xiu's bowstring is made of carbon nanotubes.

In addition, the bow limbs made of composite materials combined with carbon nanotubes are far from comparable to carbon fiber bow limbs, so the bow limbs made of carbon nanotubes have become the fifth generation of bow limbs.

Of course, if it is successfully manufactured, the most significant difference will be the initial velocity of the bow when shooting arrows. For example, the first generation of wooden bows, that is, the ancient bows, have an initial velocity of arrows of only 40 to 50 meters per second, and the slightly better ones are only 60 meters per second.

However, the second-generation steel bow limbs can only reach an initial arrow velocity of 70 to 80 meters per second. There is no way that the main performance of the bow is actually determined by the rebound performance and energy storage performance of the bow limbs.

After that came the third or fourth generation of bows. Because they used composite artificial materials, the initial velocity of the bow and arrow could reach about ninety to one hundred and fifty-six meters per second.

However, the initial velocity of the bow made of carbon nanotubes by Liu Xiu can reach 300 meters per second, which is almost doubled, equivalent to a four-fold increase in kinetic energy!

Although this speed seems to be similar to the initial velocity of ordinary pistol bullets, don't forget the weight of the arrow itself and the shape of the arrow is a long rod, just like the tail-stabilized armor-piercing projectile used by tanks to break armor, so it is more conducive to armor penetration. This shows that the advancement of materials can make the bow and arrow, which looks very primitive, also play a greater role.

The initial velocity of three hundred meters per second can also increase the effective range of the arrow from the original tens or hundreds of meters to three or four hundred, or even five or six hundred meters.

Moreover, with the Na'vi having a strength four to five times that of ordinary humans, they can naturally pull a bow with greater tension, use heavier arrows, and shoot arrows with more powerful power.

However, Liu Xiu was in a dilemma when he saw the Na'vi people who surrounded his spaceship, because there were hundreds of them here.

After all, except for children, all Na'vi people, both men and women, are very good at archery and hunting, so they naturally have a special love for bows and arrows.

But Liu Xiu doesn’t have that many carbon nanotube plates in the material warehouse of his spacecraft!
Liu Xiu did some calculations and found that there was not enough carbon nanotube material to make the bow limbs in order to make a bow that fit the Na'vi's body shape. He could only make fifty modern compound bows at most.

As for the high-tech material of carbon nanotubes, Liu Xiu’s spacecraft does not have the machines to produce this material!

Fortunately, the wandering blue planet, which serves as the production base of carbon nanotubes, has already broken away from the curvature navigation.

At this moment, the two thousand steering planetary engines at the equator of the wandering blue planet are running at full power to steer the blue planet!

That's right, because the Blue Planet itself has a large mass, so if you want to dock safely in Proxima Centauri's orbit, you must first slow down through the planetary engine, and then you can be captured by Proxima Centauri's gravity, and finally you can rotate around Proxima Centauri like you did in the solar system to obtain the warmth of the star.

Of course, deceleration is a long process. According to Liu Xiu's estimation, it would take at least thirty to fifty years of full-power reverse propulsion to reduce the speed of the wandering blue planet.

However, Liu Xiu could not wait any longer, because he had to finalize the matters of Proxima Centauri and Pandora with Wandering Blue Star as soon as possible. After all, Liu Xiu had been away from Blue Star for more than ten years, and it was hard to say whether the people on Wandering Blue Star still recognized Liu Xiu as the captain of Blue Star.

However, before leaving, Liu Xiu cut all the carbon nanotube materials in the spacecraft warehouse into bow pieces, and thus fifty composite bows made of high-tech materials flowed into the Jackdao tribe.

(End of this chapter)