The laws of gas on Earth (PV/T = nR, n = mass of gaseous matter, R is constant) also apply in the world of Vares.

According to the formula, when the air temperature and the volume of the cylinder are constant, the pressure in the cylinder decreases year-on-year as the gas pushes the bullet to lose. Then it is conceivable that the less gas in the cylinder, the lower the pressure, and the kinetic energy of the excited bullet continues to decrease, causing less and less lethality to the enemy. It is reflected in the shooting of air guns, that is, the first few bullets are powerful, and the power of the subsequent bullets is getting worse and worse, showing a significant lack of stamina.

If you use "star-carbon plastic" to make gas cylinders, the above dilemma will be solved. The magic of this material is that it has extremely stable elasticity, and the volume of the cylinder expands during the inflation process, but the pressure changes slightly, and the volume of the cylinder shrinks synchronously during the deflation process, and the pressure remains almost constant. As a result, rifle cylinders made of astro-carbon plastic have unmatched stability, and there is no noticeable difference between the power of the first and last bullets fired. As for the pressure provided by the cylinder, it can be adjusted by changing the ratio of star mass to carbon fiber to ensure that enough kinetic energy is provided for each bullet.

The invention of the stellar-carbon compound made it possible to create inexpensive and efficient gas cylinders. Kafta quickly came up with a design plan to build the cylinder into the rifle's stock, which not only saves space, but also protects the stock shell from the built-in cylinder.

Jack was pleased with his old partner's design, and the next question was how to improve the inflation efficiency. If, as Roland calls the "Kiranduni Air Rifle", it takes a thousand manual refueling sessions to fill a bottle...... Such weapons are not of practical value at all.

While Jack and Kafta were pondering, Nikita's "Magical Engineering" research group received good news that after a year of research, Nikita's team had successfully achieved an approximate constancy of the "Call to the Otherworld" type spell.

The results of this study are very difficult to summarize, but the content is actually very simple. Whether it's magic or arcane, there's a class of spells that "call out to otherworldly creatures." For example, the 5-ring arcane "Lesser Otherworldly Oath", and its subsequent advanced versions: Otherworldly Oath, High Otherworldly Oath, and Legendary Otherworldly Oath. The corresponding magic version has a slightly different name, which is "Secondary Otherworldly Oath", "Otherworldly Oath", "High Otherworldly Oath" and "Legendary Otherworldly Oath", the effect is roughly the same, but the arcane version is more violent, using kidnapping to force otherworldly creatures to obey orders, no need to pay remuneration, but there is a risk of being counterattacked, the divine version is more gentle, friendly negotiation with the called otherworldly creatures, and use the way of payment to lure the other party to work for themselves, if the charm is high enough, you can also bargain, Even enticing otherworldly creatures to work for free.

Most of these spells are short-lived, and if you want to keep the summoned otherworldly creatures by your side for a long time, you have to use extraordinary means. Nikita's method is to use magic crystals as bait to attract otherworldly creatures, and then cooperate with the "anti-evil magic circle" to imprison them in a specific container to achieve a near-constant effect. The reason why it is "almost constant" is because every time an imprisoned otherworldly creature is ordered to provide services, different amounts of magic crystals will be consumed according to the content of the service, and the magic crystals must be replenished in time when they are exhausted, otherwise the otherworldly creatures will lose their motivation to work, and will even try to escape.

Speaking of which, how did this technology help Jack and Kafta in their "Wind Gun" research and development project?

The key lies in the word "wind" of "wind spear". There are thousands of otherworldly creatures that can be summoned to the main material realm by the caster, and each otherworldly creature has unique abilities, among which the "wind elemental" specializes in manipulating air currents and creating whirlwinds on the ground. As you can imagine, as long as you stuff a wind element into the container, it will become a living automatic inflator, and as long as you give it a little magic crystal as a reward, it will happily turn into a small whirlwind, filling the rifle cylinder connected to the container with high-pressure air, and maybe even take this as a fun game.

Jack and Kafta's vision was soon tested experimentally. With the help of Nikita and Ajelina, they successfully summoned a small wind elemental and sealed it in a cylinder lined with "star-carbon plastic", creating the world's first "magic inflator" in Vares.

After further technical improvements, by the beginning of 1624, the inflator of this model was very mature and could be used as a mass production sample.

Roland accepted the results of Jack and Kafta and was very satisfied with the performance of the "Wind Gun" and the "Magic Inflator", and the cost was within the ideal range.

For example, the small magic inflator can fill at least 5,000 gas cylinders for every ounce of magic crystal consumed, and can inflate 10 rifle stocks at the same time. The efficiency is very high, the cylinders (stocks) can be filled in 1 minute, and each cylinder can fire 40 rounds of rifle ammunition.

With a volume of only 4 cubic feet and a weight of 150 pounds, the small magic inflator is easy to carry and not expensive at 2,000 gold talers.

Roland immediately made a decision after acceptance, and in the future, air rifles and small inflators would become the standard squad equipment of the Koras Army. Militia training camps in various localities will also be equipped with such small inflators in the future, and the commune management committee will purchase one at the expense of one, which will be enough for the training of 100 militiamen.

In addition to the air rifle staple, Jack and Kafta also used their spare time to tinker with two by-products.

One is the commander's special portable air pistol, which is similar in appearance to the Magic Crystal revolver, with a built-in gas cylinder in the grip, and the pistol holster comes with a pocket inflator, and the pistol can be automatically inflated when inserted into the holster, and the cylinder can be filled in 1 minute, and it can continuously fire 20 pistol rounds.

Another achievement is the "large inflatable platform of the military station" specially equipped for troops above the company level, which is about to catch up with a field cannon, which is installed on a flatbed truck, and has to be pulled by two horses, and can inflate up to 100 "wind guns" at the same time.

Roland picked up the two air guns, long and short, and went to the shooting range to test firing in person, feeling that the effective range, destructive power and accuracy of the air guns were comparable to those of the magic crystal guns of the same specifications, but the cost was only 1/5 of the magic crystal guns. According to Kafta's calculations, if the air rifle were to achieve mass production, its factory cost would not exceed 50 gold talers. The officer-specific "air pistol" is sold for about 500 gold talers - the air pistol itself is not expensive, and the cost is mainly focused on the matching "self-inflatable gun holster".

PS. Far Eastern "Wind Gun"

Far Eastern Type 1624 air rifle

Overview: Designed by Jack and Kafta and manufactured by the dwarven gunsmiths of Icewind Dale, the Magic Air Rifle has a thick oak butt, a bronze body engraved with a profile portrait of Sindra, the goddess of fate, and an inscription: Goddess bless the self-reliant people!

Range: 1000 yards

Magazine capacity: 10 rounds

Gas cylinder (butt) energy storage: 40 rounds

Damage: 2d10

Cost: 50 gold talers

Small Air Rifle Inflator: Costs 2,000 gold talers, plus 5,000 inflats/ounce magic crystals.

Far Eastern Type 1624 Air Pistol (for commanders)

Range: 60 yards

Magazine capacity: 6 rounds

Gas cylinder (butt) energy storage: 18 rounds

Damage: 1d10

Market Price: 500 Quintal (+ Inflatable Holster)

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