The hydraulic reentry mechanism essentially uses the residual gas of the gun to push the hydraulic cylinder to counteract the recoil force and avoid the gun retreating, which is similar to that of an automated weapon, while the spring reentry does not need to be so complicated.

Because the axillary people still used a large amount of black powder, and there was a large amount of residue left, they used the gas produced by gunpowder to redesign the blowing structure, and before the cartridge exited, the powder residue was blown into the cartridge barrel and exited together, and at the same time, there was a powder residue tank in front of the gun latch, and sporadic powder residue entered it.

After several launches, the fastening flap is opened, the residue tank is discharged, and then closed again. In this way, a fast loading shot and a slag-free effect were achieved, but with such a design, it was necessary to abandon the hydraulic reentry mechanism and use spring reentry.

Bailiyan measured it with a caliper, the caliber of the projectile reached 153 millimeters (about 138 millimeters), and the diameter of the cartridge reached 322 millimeters (about 290 millimeters).

Even so, the firing range is still no better than the 95 millimeter cannon and heavy artillery of the Xian army, and the power of the projectile is only one-third.

Of course, it is more than enough to deal with the wooden buildings in Guangxin City, and it is not enough to fart to deal with reinforced concrete.

In addition, what is even more shocking is that a batch of special shells was found in the cabin, the warhead was marked with red paint, and after opening, white powder was found.

This batch of ammonium nitrate shells had been hidden under the hold of the ship before, and they were not put into actual combat, perhaps they were put into actual combat, and the number was small, but it did not attract enough attention from the Xian army and was ignored.

Or because the chemical industry of the axillary people is not developed, the chemical process path mastered is limited [Note], and they have not yet obtained the ability to produce ammonium nitrate from ammonia in large quantities industrially, so the price is expensive, and they will not be used unless they have to.

Lincheng Chemical has the ability to industrialize the production of ammonia [ammonia], and ammonium nitrate explosion is also a mass-produced explosive, but it is based on the industrial production of Bailiyan cognition, and can use the most convenient chemical process path to achieve cheap production

In addition, there is a problem, although ammonium nitrate is a relatively safe explosive, but it is less safe than TNT, it is safe and reliable at room temperature, but it will cause an explosion under the action of high temperature and strong current.

The axillary firing pin uses the key element to strike copper with an iron tetroxide alloy to produce sparks and strong currents, although the axillary man paints a relatively insulating layer of paint on the cartridge for insulation.

However, at the moment of striking the primer, there is still an electric current that comes into contact with the cartridge case, which is eventually conducted into the ammonium nitrate explosive, which may explode before the projectile is discharged. Therefore, the originally safe ammonium nitrate explosives have become unsafe under the technical conditions of the axillary people.

But this hypothesis does not seem to hold very well, and Bailiyan prefers to the chemical path that they have not yet obtained for the industrial production of ammonia. Because the explosive chamber of the warhead was also painted, and there were two layers of wax paper, apparently for insulation.

But in any case, there is no suspense that a large number of bombs represented by ammonium nitrate explosives will be put into the battlefield, and as the war progresses, it will soon stimulate the axillary people to find ways to improve the chemical process, obtain ammonia, and make more and cheaper ammonium nitrate.

If the emergence of ammonium nitrate explosives is only a chemical breakthrough, the emergence of heavy machine gun automation has undoubtedly subverted Bailiyan's cognition

Previously, he had judged that the axillary people needed larger and longer ammunition because of the low kinetic energy of black powder and the residue of drug residue, so at the same time, the 155 millicaliber bullet was more suitable for their kind of killing, and it was more than enough to kill.

Therefore, this 155-millimeter ammunition, despite the use of black powder, has an effective firing range of nearly 600 paces, and stray bullets can hit 900 paces away, which is equivalent to half the effective range of an anti-aircraft machine gun of the same caliber.

The fact that the cartridge is so large is not only a technical constraint on the lack of kinetic energy of black powder, but also a source of gas kinetic energy if it is used in an automated weapon designed by the armpit man.

Due to the restriction of the kinetic energy of the 155 millimeter large-caliber black powder gun, the gunpowder gas produced is not enough to use the howitzer blowing and slag removal structure.

Therefore, they added a compressed air cylinder with a capacity of about four liters to the design of their heavy machine gun, and used the gunpowder gas generated by the 155 millimeter bullet to push the piston rod to open or close the two-way gas valve of the compressed air cylinder, and the gas valve instantly generated high-pressure gas, blew away the slag, and then continued to push the bolt structure to work.

Each machine gun barrel requires two compressed gas cylinders, which can fire more than 100 rounds, the barrel is six male rifling, copper plate air cooled heat dissipation, and uses 50 side-mounted coiled spring drums, which are universal 155 millicaliber rifle rounds.

When using, the hand shakes a runner, and the runner is shaken by manpower to realize the rapid loading and withdrawal of ammunition, and under the existing simple technical conditions, semi-automatic, automatic loading and continuous firepower output are basically realized.

Through further searching, the inflatable chamber and thousands of compressed gas cylinders and supporting maintenance parts were found in the cabin on the second floor of the ship, using multiple double-cylinder alcohol internal combustion engine compressed air pumps, connecting metal pipes, inflating the gas cylinders, sealing the gas cylinders with two-way gas valves, and thickening the bottom of the gas cylinders due to the enemy at the tail of the gas cylinders.

It can be further inferred that the axillary did not begin to use oil, and it was not even found that oil would not have been used as an internal combustion engine dye.

The energy and power provided by alcohol is incomparable to that of gasoline, diesel and kerosene, and the carbon molecular chain of alcohol is too short, the energy is low, and the calorific value is low, resulting in the small power output.

The only way to increase the output power of the alcohol internal combustion engine is to increase the size of the bore of the body and increase the amount of nozzle spray to improve the gas compression ratio generated by the thermal kinetic energy of the combustion chamber.

Therefore, it is almost impossible to develop efficient, large-load vehicles, but it is more than enough for air pumps, water pumps, oil pumps, and power generation.

Due to the redundant design, this 155-caliber automatic weapon, even if it is armpit man, cannot be carried by individual soldiers and used personally, and requires supporting maintenance of fixed mounts and related logistics.

However, Bai Liyan believed that with the physical strength of the armpit people, four armpit people could be equipped with one of these cylinder-type heavy machine guns, carrying more than 20 gas cylinders and 500 rounds of ammunition.

At present, there is no information showing that the armpit people appeared and put this kind of weapon in land warfare and other naval battles, which can only show that the armpit people who invaded the south were not elite, and they were still in the transitional stage of replacing breech weapons and breech fixed weapons.

After all, in their opinion, a third-rate army is enough to sweep away the human race with only a bronze civilization, on the contrary, the civil war between them requires more advanced weapons to defend their country.

This means that the situation on land is not yet severe, and it is possible that in the second half of next year, when the armpit natives realize that in the face of a more powerful human, the armpit people, all equipped with breech weapons, will set out from the mainland and move south.

The search of the ironclad lasted more than a month, and many personal belongings and valuable graphic documents were found, administrative maps of the northern hemisphere, as well as industrial artifacts such as clocks and watches that symbolized industrial prowess.

However, no electricity-related equipment has been found, not even electric lights, and oil, candles, and gas lamps are still used for lighting.

Bailiyan successively dispatched two systems of military and scientific research, and a team of more than 300 experts to conduct a systematic technical assessment of the two ironclad ships floating on the surface.

And Bailiyan took a fancy to two ships, a total of eight large steam engines, boilers, alcohol internal combustion engines and nearly 8,000 tons of coal.

Although this thing is a marine steam engine, the structure is very mature and the power output is amazing, otherwise it would not be able to propel this cylindrical canned ironclad ship with great resistance in the water.

Bailiyan planned to cut and burn the upper deck through the hole, dismantle the eight steam engines from the power room, and transport them back to Yongxing for surveying and mapping research, and then use them for industrial production and thermal power generation.

Other guns, ammunition and artillery can be dismantled and all taken away, and after surveying and mapping to understand the technical performance, they can be used to equip defensive operations, and when used for offense, they will inevitably appear in the way.

The survey of the ironclad continued until early December, and a torpedo launcher and compressed air torpedo were found in the lower level of the ship's hold, a discovery that made Bailiyan gasp. [Note 1]

In the early days, due to technical constraints, torpedoes were mostly powered by compressed air, so their range was very short, but they lacked enough to sink a steel ship with a displacement of 5,000 tons within two miles.

After the armpit landing force entrenched in Jiaoping County, Sangbei County, withdrew, except for a detachment of 15 7,000 and 10,000 stone clippers, all the main forces fled westward, but it was not ruled out that they would search the outer islands to the north in an attempt to land and establish a base.

However, last year, Bailiyan ordered Chen Qu to evacuate all the islanders, lay mines and mines, and dropped potassium cyanide poison on all the islands with fresh water, so that they would not be able to gain a foothold on the outer islands for three or two years, and that they would not be able to become a springboard for a close attack on the coast of the Argent State.

On December 19, after dealing with the military affairs of Guangxin and Sangbei, Bailiyan returned to Shanling to return to King Xian.

This battle was more significant than the first naval battle of Guangxin, in the face of sail wooden ships, if the princes could still win with inferior equipment, for the other vassal states, in the face of ironclad warships, there was no way to fight back.

Therefore, the significance of sinking and destroying the four ironclad ships is no less than sinking and damaging more than 300 enemy ships in the first Guangxin naval battle, which undoubtedly greatly increased the confidence of the princes in resisting the invasion.

In the Guangyuan Palace, Baili Yan bowed down and saluted King Xian

"Chen Bailiyan was ordered to resist the enemy, and now he is defeated and retreated, and the minister is reinstated to the king."

"Yongxing Hou is exempt."

"King Xie."

Straightening up his waist, Bai Liyan handed over the post-war summary report to King Xian, and then said

"In this battle, our people suffered more than 9,000 casualties, captured 875 enemy soldiers, and sank or damaged 51 enemy ships in Beihai and Sangbei counties, four of which were ironclad ships. The number of dead enemies is innumerable, only more than 7,600 corpses have been counted, and the rest of the corpses in the sea cannot be counted, most of them are armpit men carried by four ironclad ships. In addition, more than 20,000 armpit guns and artillery were seized, and the ammunition was not counted. ”

"Okay, the Marquis of Yongxing is really brave and good at fighting, and he is really the first capable minister of the widow." Jiang Yu praised endlessly, but in fact, at this moment, he had a different idea in his heart.

"The king has a reputation, the prosperity of Xianguo today depends on the wisdom and martial arts of King Renwu, if there is no reuse and determination of the first king, there will be no prosperity of our country today. In addition, although the invasion of the armpit fleet was repelled in this battle, the entire city of Guangxin was destroyed under artillery fire, and hundreds of thousands of people were displaced. ”

"This matter is open to the widow after deep thought."

Jiang Stinging did not directly reply to Bailiyan's request, obviously gloating about Guangxin's situation.

Without spending a single soldier, cutting off the hidden danger of Guangxin and breaking Bailiyan's arm, Jiang Qian certainly wouldn't let Guangxin ease his breath so easily.

[Note 1] The world's first torpedo was invented by British engineer Robert Whitehead in 1866, using the principle of compressed air propulsion to launch torpedoes, with a maximum range of 640. Later, in 1904, the thermal torpedo was invented by the Americans, and the range was further increased.

But it is worth mentioning that the attention of the torpedo was discovered in 1864 by the Ottoman Empire, known as the sick man of Europe, but the effect was not very good.

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