As soon as the envoy of the court left, Yang Wenli felt more and more that time was precious, and decided to speed up the development of mortars, and then sail far to the north.

Some time ago, he had already done a lot of experiments and decided on the shape of mortar shells.

This step is quite important, as it determines whether the shell can be fired normally, and whether it can be fired accurately.

However, the next step is the biggest problem, the collision fuze or the trigger fuze, the trigger fuze is divided into mechanical, electronic, photo-triggered, chemical-triggered, mechatronic and the most cutting-edge intelligent according to the technical difficulty.

According to the time interval from the fuze collision target to the detonation of the fuze, it can be divided into three categories: instantaneous, inertial and delayed triggering fuze.

It is the simplest mechanical trigger fuse, and it was not developed in Europe until the 30s of the 20th century, which shows that its technical difficulty is very high.

It has a paradoxical difficulty, the fuse requires sensitivity, no matter what angle the shell hits the ground, it must ensure that each shell explodes, there can be no duds, but it also requires stability, reliability and safety.

You must know that when the shell is ignited and fired in the chamber, there is a huge overload and kinetic energy, and the fuse is too sensitive, and it may explode directly in the chamber, so how can it be stable, safe and reliable?

Previous researchers were stumped by this paradoxical problem, and it was not until modern times that this problem was solved, but the process was very complicated, and the original mechanical trigger fuse had as many as 35 parts.

It's too complicated, Yang Wenli can't do it, because he doesn't have a modern machine tool, he can only find another way to solve it.

After thinking about it, he found that the launch of the cannonball goes through two processes, that is, the cannonball is ejected and the cannonball hits the ground, and the kinetic energy of the two processes is opposite.

Anyone who can drive knows that starting and braking, the person in the car has to go through two processes: recoil and leaning forward, which is similar to the principle of the shell firing process.

He wanted to use these two basic principles to develop a simple, safe and reliable trigger-type instantaneous detonation fuse.

Another difference is that he does not have a safety detonator, so he can only use the method of loading before launch, which is very different from modern mortar shells.

He first had to test a detonator that would not explode if fired in the chamber of the gun and with a huge overload.

Thundermercury is a very explosive substance, you have to find a way to reduce its sensitivity, very simple, then the opposite, when making thundermercury, doped it, so that it turns from white crystals to gray powder.

In this way, its sensitivity is greatly reduced, and the powder has the advantage of being tighter and not exploding due to internal friction and collision in the event of a huge overload.

The work that Yang Wenli needs to do is to ensure that the firing needle can effectively explode, which needs to go through a lot of experiments to get the optimal doping ratio.

This kind of local safety detonator also has to go through, a large number of launch experiments, the same as the previous experiment mortar shell, there is no need to load explosives, steel balls, just test the detonator does not explode after launching, and then the shell hits the ground, after the firing needle fire, but the method of exploding, it is a qualified safety detonator.

Yang Wenli handed over the test of the safety detonator to Wang Rucheng to take someone to the experiment, but he himself was thinking about it and stumbling on the problem of the fuse.

After a few days of hard thinking, Yang Wenli finally found a relatively simple safe fuze method that he could do under the current rudimentary conditions.

It is said to be simple, but in fact, there are nearly ten parts, which require three springs of different sizes, two steel balls for bayonet pins, a firing pin and two short steel rods, and a small amount of machining and more precise technology.

The design was made, but it was still difficult to make, and Yang Wenli also had to solve the problem of several springs and precision craftsmanship.

The spring problem was easier to solve, and he had long expected that the spring would be used in the future, so he already had the whole idea.

The specific method is to draw the wire, after proper tempering, and then directly winding, these three processes are coherent, but the tempering must be charcoal, in fact, it is to dope the steel wire with carbon, making it weaker and softer, and the latter winding process is to take advantage of the steel wire is still soft, it is directly wound into a spring.

Some people will wonder why the steel wire is softer after being mixed with carbon? It should be harder.

In fact, in the process of wire drawing, a large amount of carbon has been squeezed out, and the texture is tighter, so the steel wire has become very hard and elastic.

Those who have been involved in the construction site know that after the six yards of wire are drawn into a smaller steel bar, the steel bar becomes very hard, and only tempering can make it soft.

With this simple method, as long as you master the degree of tempering, you can get the elasticity requirements you want to achieve, which is not as difficult as other reborn people say.

Theoretically very simple, but the actual operation is also time-consuming, Yang Wenli handed over this task to his deputy Wang Rucheng, and Wang Rucheng then decomposed the task, arranged for him to several assistants, and led the workers to carry out it simultaneously, which can significantly improve the speed of research and development.

The last few steps of simple machining, Yang Wenli found a way to replace it with precision casting and drilling, and the matter was finally solved perfectly.

During the period when Yang Wenli was engaged in scientific research on Changsheng Island, there was also a small incident, Lushun Deputy General Zhang Pan, after all, he still did not dare to rebel, and honestly went to Beijing to report on his work, his end will be very tragic, this is something that fools know, so he also left a way back for his family and arranged for them to take refuge on Changsheng Island.

This is just a gesture for Yang Wenli, the neighborhood relationship in the past two years, to be honest, he has asked Zhang Pan a lot of glory, because in other Ming armies, the two armies will never have such a harmonious relationship, and now Zhang Pan is in trouble, and it is also appropriate to help.

Zhang Pan's army is weak, and has no logistics capacity, all rely on Denglai's supply, and more importantly, it does not have its own military industry research and development capabilities, as long as it rebels, it is a dead end, unless it takes refuge in Jiannu, but that is the worst outcome, don't make a move in the court, the black armor army will ruthlessly eliminate him.

As for taking refuge in the Black Armor Army, Zhang Pan didn't know the details of the Black Armor Army, he only knew that it was very strong, but the number of people was too small, so Zhang Pan didn't dare to bet at all.

He wanted to sacrifice himself to keep his family and loyal subordinates, and it was understandable that he would think so.

Seriously, Yang Wenli didn't really want to accept Zhang Pan's troops, the Ming army's troops had accumulated shortcomings for a long time, if they were mixed into the black armor army, it would be like ink staining black water, and Zhang Pan's troops were too weak, and Yang Wenli was also a little disdainful.

In any case, the matter was finally settled perfectly, and the Liaodong Peninsula did not enter an eventful season, which was good for the Black Armor Army.

……

When spring came, the grass grew wildly, and the horses that had eaten the dry grass for the winter finally had green and juicy grass to eat, and the tribesmen of Albugu drove their horses around on Changsheng Island, and everywhere there were the cheerful songs of the herdsmen, and soon the horses were fat, and they could train the cavalry.

This is a big deal, and it is currently the number one thing for the Black Armor Army.