After nearly a week of assembly and testing, Roland and Anna completed the development of the bomb touch fuze.
Compared with the fuze of the shell, it neither needs to withstand high temperature and high pressure, nor does it have high g overload when it is discharged, so the structure is extremely simple. But it is such a thing composed of a firing pin and a spring, and the two have also tested many times before they succeeded.
The main problem is that no one knows how much spring force the spring needs to keep from misfiring in the event of an accidental fall, while the firing pin must be able to stably trigger the primer in a normal throw.
He and Anna could only test a little by changing the thickness and hardness of the spring.
Fortunately, the latter and Lucia have done a lot of preliminary work on weekdays, so Roland has more and more high-quality materials on hand. The final test is 1365 alloy steel, which has high hardness and low toughness. Even if the bomb falls from a height of one meter, it will not be compressed to the end.
A suitable spring was selected, and the rest fell into place. Even if Roland has never seen the real fuse, he can design one by himself based on its working principle.
Falling behind is definitely behind, but it is enough for a stupid bomb.
The finished touch fuze is like a cylinder, twelve centimeters long and five centimeters in diameter, with a thread underneath that can be screwed into the opening at the top of the bomb.
Its interior is a lower convex groove, and the striker is also similar, and can be inserted into the groove. Under normal conditions, its upper part is pushed against the notch by the spring, and the firing pin falls into the groove, exactly one finger away from the primer. To be on the safe side, Roland also made an extra hole in the head of the firing pin, and used a plug to fix it on the shell. Before dropping the bomb, the iron rod must be pulled out so that the firing pin could move up and down.
The mock test was conducted on a sunny afternoon.
Since the bomb was nearly the weight of five nightingales after being filled with gravel and black powder, Roland did not board the hot air balloon, but watched with a lookout mirror 300 meters away from the bombing site.
In addition to him, there were also the First Army Commander Iron Axe and Chief Knight Carter Lannis.
"Are you going to use a hot air balloon to throw a giant explosive bag into the palace?" After hearing Roland's battle plan, Carter couldn't believe his ears. Attacking from a height of two thousand meters, ignoring the city walls and garrison forces, this completely subverted his previous combat philosophy. Of course, in Border Town this year, he has been subverted many times.
"As long as it's properly controlled, it's not impossible," Roland nodded. "Tifeco is forcing a new militia team. If he can't stop him, the Western Region will inevitably be attacked by the drug addicts. Even if he wins, It won't do us any favors."
The secret letter sent by Thassa shows that Tifeko still wants to use the same old routine to consume his strength, and he does not know whether the team of messengers sent by Barov will be able to draw more people to the border before the other party. town.
"If you can really throw the wrath of Tianlei on Tifeko's head, he will definitely be overwhelmed by fright!" Iron Axe said excitedly, "This is an irresistible punishment!"
"Hopefully," Roland smiled.
Although Thassa mentioned in the letter that Tifeko has probably figured out the formula of black powder and opened a workshop in the inner city to try to mass-produce this dangerous substance, but after thinking it over and over again, he still chose the target. above the palace.
The reason is simple, because the palace is eye-catching enough.
Looking down from a height of 2,000 meters, even the most magnificent city in Graycastle is only half the size of a palm, so it is necessary to find the landing point in advance when dropping bombs. The palace is in the center of the inner city, surrounded by red tile walls, and the top of the palace is paved with pure white slate. It looks particularly eye-catching during the fall, and it is almost impossible to recognize the wrong target.
But the workshop is different.
He didn't have the floor plan of the capital at hand, and there was no one on the ground to guide him. It was difficult to describe the location of the target with words alone. In addition, the workshop itself is not large. Once the bomb falls into the residence, the plan will not be worth the gain.
Suddenly, a white shadow fell straight to the ground, causing a plume of smoke to rise in the testing ground, followed by a dull landing sound.
"It looks like the bomb has already landed," Roland put away the observation glass, "Let's see the result."
After a week of training, Lightning's bomb-dropping skills have made great progress. The bomb landed less than five meters away from the center of the target. The bomb body was completely immersed in the soil, and the shell was greatly deformed under the impact.
When the Yuanwang landed and Anna cut the bomb with black fire, everyone saw that the soil near the fuze had turned black, which proved that the high temperature gas of the primer ignited the black powder sprinkled on the surface of the soil, and the fuze itself worked. normal. If the projectile is filled with nitrostarch, it can easily create a deep pit of four to six meters and kill unobstructed personnel within a range of fifty meters.
Now that the development of the bomb is completed, the next step is to arrange the battle plan.
Roland's eyes swept over the crowd one by one, and he said slowly, "The surprise attack on the capital is scheduled to be executed next Monday. The first is Iron Axe. You will lead a 50-person musket team to escort the witch to the outskirts of Silverlight City. There are A mountainous area can block the view, whether it is setting up a camp or flying a balloon, it is very suitable."
"As ordered, Your Highness!" Iron Axe responded.
"Aren't we flying directly from Border Town?" Wendy asked.
"No, that's too far," Roland shook his head. It would take at least a week to get to the capital from the Western Region, and it would take about three days for a direct flight from the Yaowang, or six days if you count the return journey. After the hanging basket was equipped with a throwing rack, it could only carry two people, and Nightingale could not go with them. Among the four witches, except for Anna, none of them were capable of fighting. It was too risky to spend six nights in the wild, and he couldn't rest assured. "If you start from Silver Light City, you can drop bombs in just one day and return before the sun sets."
"Next is the witch. This time the mission personnel are Anna, Wendy, Lightning, Maisie, Nightingale and Sylvie. The latter two are responsible for monitoring the situation around the camp. Lightning," he looked at the little girl, "it's up to you whether you can succeed or not."
"Leave it to me." The latter patted his chest and said.
"Then the last thing I want to say is, pay attention to safety," Roland said word by word, "I will wait for you to come back in Border Town."
Four days later, the first bomb, Dongfeng No. 1, was loaded by a carriage, and under the escort of the First Army team, boarded the cargo ship bound for Silver Light City. (., Your support is my biggest motivation.)
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