After nearly a week of assembly and testing, Roland and Anna worked together to develop the bomb contact fuse. Pen "Fun" Pavilion www.biquge.info

Compared with the fuse of the shell, it does not need to withstand high temperature and pressure, nor does it have a high-G overload when discharged, so the structure is extremely simple. But it was such a thing made of firing pins and springs, and the two of them tested it many times before they succeeded.

The main problem is that no one knows how much force the spring needs to bounce to avoid misfire in the event of an accidental fall, and to ensure that the firing pin can trigger the primer stably during a normal throw.

He and Anna could only test a little by changing the thickness and hardness of the springs.

Fortunately, the latter and Lucia had done a lot of upfront work on weekdays, so Roland had more and more high-quality materials at his disposal. The last to pass the test was alloy steel No. 1365, which has high hardness and low toughness, and even if the bomb lands from a height of one meter, it will not be compressed to the end.

Once the right spring is chosen, the rest falls into place. Even if Roland hadn't seen a real fuse, he could design one by himself based on how it worked.

It is definitely backward, but it is enough for a stupid black and coarse bomb.

The finished version of the contact fuse resembles a cylinder, twelve centimeters long and about five centimeters in diameter, with a thread underneath that can be screwed into the opening at the top of the bomb.

The inside of it is a convex groove, and the firing pin is similarly shaped and fits into the groove. In normal conditions, its upper part is spring-loaded against the notch, and the firing pin falls into the groove, exactly a finger's distance from the primer. To be on the safe side, Roland also made an extra hole in the head of the firing pin and attached it to the shell with a bolt, which had to be pulled out before the firing pin could move up and down.

The simulated trial test was conducted on a sunny afternoon.

Since the bomb was close to the weight of five nightingales after being filled with gravel and black powder, Roland did not board the hot air balloon, but watched it with a lookout scope from 300 meters away from the bombing site.

In addition to him, the test was also visited by the commander of the First Army, Iron Axe, and the chief knight, Carter Lannis.

"You're going to use a hot air balloon to throw a giant explosive bag into the palace?" said Carter, who couldn't believe his ears after listening to Roland's battle plan. Attacking from a height of two thousand meters, ignoring the walls and garrisons, completely subverted his previous combat philosophy - of course, he had been subverted many times during the year in Frontier Town.

"It's not impossible to achieve this with proper control," Roland nodded, "Tifeko is forcibly recruiting a new militia, and if he can't be stopped, the Westside will inevitably be attacked by the drug army again." Even if we win, it won't give us the slightest benefit. ”

The secret letter sent by Tasa showed that Tifeko still wanted to use the old routine to drain his strength, and he did not know if the emissary team sent by Barov would be able to attract more people to the border towns before the other side.

"If you can really throw the wrath of the Thunder on Tifeko's head, he will be overwhelmed with fear!" Iron Axe said excitedly, "This is an irresistible heavenly punishment!"

"I hope so," Roland smiled.

Although Tasa mentions in his letter that Tifeco may have figured out the recipe for black powder and set up workshops in the inner city in an attempt to produce this dangerous item in large quantities, he has chosen to target the palace after careful consideration.

The reason is simple, because the palace is eye-catching enough.

Looking down from a height of two thousand meters, even the grandest city of Grey Keep is only half the size of a palm, so it is necessary to find a landing spot in advance when dropping bombs. The palace is located in the middle of the inner city, surrounded by red tile walls, and the top of the palace is paved with pure white stone slabs, which looks particularly striking during the fall, and it is almost impossible to misidentify the target.

But the workshop is different.

He did not have the floor plan of the royal capital at hand, and there was no one to guide him on the ground, so it was difficult to describe the location of the target in words alone. In addition, the area of the workshop itself is not large, and once the bomb falls into the people's houses, the project will not be worth the loss.

Suddenly, a white shadow fell to the ground, causing a plume of smoke to rise in the test field, followed by a dull sound of landing.

"Looks like the bomb has landed," Roland said, putting away his lookout glasses, "let's go see what happens." ”

After a week of training, Lightning's bomb throwing skills have improved considerably, and the bomb landed less than five meters from the center of the target, sinking its entire body into the mud and its shell greatly deformed under the impact.

By the time the Lookout landed and Anna sliced the bomb with black fire, everyone saw that the dirt near the fuse had turned charred black - proof that the hot gas from the primer had ignited the black powder scattered on the surface of the dirt, and that the fuse itself was working properly. If the inside of the projectile is filled with nitrogenated starch, it can easily create a crater four to six meters deep and kill and injure unsheltered personnel within 50 meters of the projectile.

Now that the development of the bomb has been completed, the next step is to arrange the battle plan.

Roland's gaze swept over everyone in turn, and he slowly spoke, "The plan to attack the royal capital is scheduled to be executed next Monday. The first is the Iron Axe, where you lead a team of fifty muskets to escort the witches to the outskirts of Silverlight. There's a mountainous area that blocks the view, perfect for camping and balloon flying. ”

"Yes, Your Highness!" replied Iron Axe.

"Aren't we flying right over from Frontier Town?" Wendy asked.

"No, that's too far," Roland shook his head, it would take at least a week to get from the west to the royal capital, and it would take about three days to make a direct flight from the Yuanwang, and six days if you count the return trip. The basket could only carry two people with a throwing stand, and Nightingale couldn't go with them, and none of the four witches except Anna were capable of fighting, and he couldn't be at ease if he spent six nights in the wild. "From Silverlight City, you'll be able to drop the bomb in just one day and return home before the sun sets. ”

"Next up is the witches, and this time the mission crews are Anna, Wendy, Lightning, Maisie, Nightingale, and Sylvie. The latter two were responsible for monitoring the situation around the camp, and the attack was carried out by the first four according to the training method, especially lightning," he looked at the little girl, "It is up to you whether it will succeed or not." ”

"Leave it to me. The latter patted his chest and said.

"Then the last thing I want to say is, stay safe," Roland said word for word, "I'll wait for you to come back in the border town." ”

Four days later, the first bomb, Dongfeng No. 1, was loaded by a horse-drawn cart and, escorted by the First Army, boarded a cargo ship bound for Silverlight City. (To be continued.) )