The winter day is slightly cool, there is no cold wind, and today is a rare good weather.

At this moment, all the dragon knights and students in Dragon Wing City were gathering on Xinghai Square, curiously watching as Green was fiddling with a few strange-looking things.

Two drawer-like rectangular tin boxes were fastened to the sides of the meatball's body, one on the left and one on the right, and then Sam, as a helper, carried out an iron pillar more than a foot long from another wooden box.

The obtuse round head, the rounded cylinder, the iron pillar begins to retract after reaching the tail, and there is a cross-shaped tail at the end of the cylinder.

The entire iron pillar looked inconspicuous except for its appearance, but at this time, the students were surprised to find that when their leader put the iron pillar into the iron box, he was extremely careful.

Opening a groove in the body and piercing the safety paper, Green pulled a rope with an iron ring from the body and hung it on the hook on the iron box.

After making all the preparations, Green waved his hand and said to the students who had been watching for a long time, "Okay, everyone prepare, all of them will take off, and the students who don't have dragons can temporarily ride on other dragons." ”

"Dean, what are we going to do here?" asked an old student curiously.

Even when the new campus of How to Train Your Dragon was built, they had never carried out such a large-scale event.

"I'm going to show you a new weapon, the aerial bomb, which will be our dragon knight's main combat weapon in the future. ”

Aerial Bomb ...... Although the students did not know what this word meant, they now felt very powerful when they heard the weapon with "bullet", after all, the shells of artillery and the bullets of muskets were all "bullets".

......

Looking down at the target on the ground, feeling that it was in the right position, Green gave a thumbs up to Sam on the back of the meatball.

Sam, who had been ready for standby, immediately pulled a rope that connected to the bottom of the iron box.

Listening to the "click", the bottom of the iron box where the buckle was opened immediately became open.

The bomb that lost its support fell to the ground due to gravity, and the rope of the iron ring began to become tense because of the fall of the bomb.

It's just that the rope that served as a rope to pull the fire rope, of course, could not withstand the weight of a 20-kilogram aerial bomb.

Without any pause, the bomb that fell straight down was almost on the ground in the blink of an eye.

"Whoa—whoa—"

A strange and brief scream appeared, like the sound of a whistle or the scream of a stinging dragon, and all the students widened their eyes in shock.

Because of such a sound, they had only heard it in the swooping Night Fury.

“10，9... 1...0。 ”

Green meditated on the numbers as he watched as the bomb slammed into the ground and then struck up a cloud of snowflakes.

It didn't hit the target, an abandoned wooden house, but at least it didn't explode before it hit the ground.

From a 500-meter sky, the houses on the ground are not much larger than a small boat, and the wind speed in the air must be taken into account.

Although the chewing stone dragon is a static bomb, it is inevitable that there will be a mistake for the first time.

It didn't take long for the crowd in the sky to see a flash of fire, followed by a loud roar.

Billowing gray smoke mixed with dirt and snowflakes rose and formed a mushroom-shaped smoke on the ground.

......

After a long time, the buzzing in their ears gradually subsided, and at this moment, the students who had seen the power of the aerial bomb for the first time were completely shocked and speechless.

"I didn't hit the target, and it looks like I'm going to have to practice a little more. Sam sighed regretfully.

"Do you want to do it again?" he asked Green, who was thinking with his chin held up.

Just now they placed an aerial bomb in both iron boxes of meatballs, one on the left and one on the right.

"Okay!" Green nodded in agreement, "but this time we'll raise some altitude before dropping bombs." ”

Green wasn't very satisfied with the power of the bomb made of granular gunpowder, but considering that the opponents he would face in the future were wooden sailboats and the breech-loading soldiers lined up in neat lines, he felt that such a bomb should be sufficient.

Green's bomb pylons look a bit like boxes for fire extinguishers, and the 20KG bombs look about the same size as a fire extinguisher.

The fuse of the aerial bomb is similar to that of the early wooden-handled grenades, and it is a simple delayed fuse. An iron pipe is filled with hard gunpowder as the ignition powder, while glass powder, sulfur and drawstring are filled.

When the bottom of the pylon box is opened, the bomb will fall downward due to its own weight, and then the pull ring hanging on the box will pull the fuse in the fuse, and the spark caused by the friction between the glass powder and the rough iron pipe wall will ignite the ignition powder.

Then, when the bomb falls to the ground, the ignition powder in the fuse tube is just burned, and the particle powder that is connected to the re-ignition bomb forms an explosion.

Although the reliability of this fuse has yet to be verified many times, it seems that the effect of the explosion is not bad.

And a 20KG iron bullet dropped from the sky at a distance of 500 meters, even if it did not explode, the impact force formed alone was not something that those wooden sailboats could resist.

But now Green thinks that the most important thing is that the dragon knights should practice more aerial bombing, and then improve the hit rate of aerial bombs.

The second air-dropped bomb still missed, and exploded before it could hit the ground.

Broken pieces of iron flew everywhere, and some even soared into the sky.

However, the power of black powder was not very great, and the iron piece did not fly very high before it fell.

Sam rubbed his hands together in embarrassment, missing the target twice, making his face a little unbearable as a teacher.

However, the students didn't care about this at all, they were looking at the mushroom cloud rising in the sky and talking.

"Would you like to try two more?" Sam whispered as he flew over to Green's side.

Green couldn't help but smile and spread his hands, "We made two of them this time, just as an experiment, and we will improve them in the future." And without a lot of practice, it's really hard for you to hit the target. ”

"Why?" Sam scratched his head in confusion.

He could be sure he was directly above the target, and he took out his glasses to take a closer look.

Green smiled and untied the scarf around his neck, "Because it's windy!"

In fact, with the load of the chewing stone dragon, there is no problem with five on the left and right, and at present, Longyi City already has more than 5O chewing stone dragons.

A total of more than 500 20KG aerial bombs exploded together, which is equivalent to the power of 10,000 tons of black powder explosion, even if it does not hit the target, even the fragmented shrapnel is enough to sweep away all the enemies on the ground.