Due to the relatively large weight of the metal products, the maximum length of the No. 7 time fuse was limited in order to ensure that the flight trajectory of the shell could be guaranteed as much as possible after flying out.

In other words, the maximum burning time of the time 7 fuse is limited to a fixed value. Chen Xin personally tested and determined that this time was only between 5.25 seconds and 5.5 seconds.

This kind of accuracy is already very high in this era.

Because its maximum burning time has been fixed, when the firing range is above 1800 meters, this kind of fuze is not used at all, therefore, the rifled guns equipped by the Huaxia Army, whether it is the navy or the army, rarely use the No. 7 time fuze.

At the time of the experiment, this fuse was very popular, and later, when a small batch was sent to the troops for trial by the colonial armies, the No. 7 time fuze using this technology was welcomed by the artillery of all teams because of its safety and reliability far beyond that of ordinary fuzes.

However, because the military budget began to be tight after the large-scale expansion of the Huaxia Army, and the manufacturing cost of this kind of fuze is too high, it cannot replace the paper time fuse.

Even, at a time when the paper time fuze has not completely replaced the wooden time fuze, the new No. 7 time fuze with high reliability cannot even squeeze out the position of the wooden time fuze, which is very difficult to use.

The time fuze is just a small branch of the artillery system of the Huaxia Army, and among the accessories that the Huaxia Army is now equipped with, it has the same key position as the fuze, which belongs to the detonator.

Detonators, the equipment of the Huaxia Army has been very long, and with the passage of time, the military factory is constantly improving the detonators.

At present, the most common equipment of the Huaxia army is a friction detonator. The body of such a friction detonator was a hollow brass tube filled with ordinary gunpowder.

After the lower end of the detonator was opened, it was resealed with wax fei;

Its upper end was closed, and a hole was made near the upper end, to which a small hollow brass tube was attached, and inside was a special powder ignited by friction. The copper fuse is fastened to the end of the small copper pipe through a large copper pipe, and the other end is twisted into a ring.

When in use, insert the opening of the detonator into the fire door with one end facing down, and tie a rope to the ring of the fuse.

As long as this rope is pulled, the ignition powder contained in the small tube will rub against each other with the ignition cable and detonate, and then detonate the ordinary gunpowder in the large tube, and the spark enters the gun chamber through the fire door from the open end of the detonator, and detonates the propellant pressed under the shell in the gun chamber. In this way, it can be regarded as a complete launch process.

Having said so much about the first thing that the smoothbore gun turned off, then it might as well talk about the rifled gun.

Rifled guns, as the name suggests, are guns engraved with rifling in the breech, in this processing accuracy is not fine enough, and the metal processing ability is far less than in the 20th century, if you want to play smoothbore guns, then you can't use the kind of play that the shell is slightly larger than the breech.

If, in the case of insufficient technical conditions, we forcibly come up with an artillery and ammunition system that imitates the 21st century, we will definitely be making ourselves unhappy.

In this era, the only rifled artillery shells that could be adopted on a large scale were the Migne shells, which were modeled after the Mingne bullets.

The Minne-type shell, in principle, is almost no different from the Mine-type bullet, and this kind of Minne-type bullet, which has not appeared at all in this era, conformed to the trend of history when it came out in the original history.

When the Minne bullet was invented, rifled guns were mostly loaded with breech, and the diameter of the shell was slightly smaller than that of the breech to facilitate the loading of the shell.

If you take a proper example, the original historical 20-pounder rifled gun called Parrott, which had a caliber of 3.67 inches and a shell diameter of only 3.63 inches, would be a good fit.

If you want to maximize the power of rifled guns, you must first make the shells embedded in the rifling, and at the same time, you must make the shells and the rifles completely match.

In order to solve this contradiction, craftsmen at that time generally adopted a technique similar to that of the Migne rifle cartridge when developing rifled artillery shells, that is, the use of deflagration gas. Causes the bottom of the Minne bullet to expand rapidly and fit into the rifling.

Although the principle is so simple and straightforward, in practice, according to this principle, many different types of shells have been developed. In history, there are the following types of famous ones.

The 12-pounder James gun, the shell fired by this James gun, had several slots in the bottom of the bullet to allow the gas after the gunpowder deflagration to pass through the reserved slots. Entering the cavity inside the shell, the lower part of the shell expands and fits into the rifling.

The 10-pounder Parrott gun, the shell fired by the Parrott gun, is equipped with a cup-shaped metal body at the bottom, which is propelled by the deflagrated gunpowder to expand and embed in the rifling, and its characteristic is that the shell itself will not be deformed, so the trajectory is relatively stable.

3-inch Hotchkiss gun, this kind of Hotchkiss cannon, friends who like military should be very familiar with it, from the late Age of Discovery to World War II, many machine guns or machine guns of the French army were named with this name.

Without further ado, the shells fired by the three-inch Hatch Chase Cannon were divided into three parts. The top of these is the main body, with a lead ring in the middle, and an iron base underneath. When fired, the iron base squeezes forward into the lead ring, causing the lead ring to expand and embed itself in the rifling.

The 3-inch Shenkl cannon, I really don't know how to translate this shell, but that's not the point, in the lower part of this shell, an apron made of a mixture of pulp and glue, something called coagulated pulp.

This kind of shell relies on this layer of "apron" to expand the shell and let the shell be embedded in the rifling.

The conical shell used in rifled guns can completely avoid the kind of spherical shells, and the drawbacks of the projectile body not being separated from the front and back after the shell is fired, and the impact fuse can be officially used.

Historically, the grenades used in the Shenkl rifled guns, with a brass impact fuse on the top, had an effective shipment rate of about 82%, which was quite reliable by the standards of that era.

The fuses used in the rifled guns of the Huaxia Army are also mainly based on this kind of impact fuze.

This is also the reason why the large-caliber heavy artillery used by the Huaxia Army in the later battle of Dalinghe still ensured a very high rate of fire at such a high rate of fire.