For the remaining days, Zhang Yang was always on Jiao Yu's side, watching him commanding several craftsmen to work, polish the inner wall of the cannon barrel and the outside of the iron ball, both of which had to become naked. The ground iron filings had already piled up a layer on the ground.

Under Zhang Yang's inspection, they worked harder. After five days of hard work, the artillery was finally able to be tested.

In order to prevent accidents, for this small island, the place was too small, so Zhang Yang could only arrange the experiment to be arranged on the southern shore farthest from the gunpowder depot and the farthest from the living area. He fired shells into the reed marsh.

To be on the safe side, for the first time, I only filled half of the gunpowder in the medicine room, stuffed the twist, and put the iron ball in it. Jiao Yu asked Zhang Yang for instructions with his eyes.

Zhang Yang nodded.

Jiao Yu lit the twister with a torch without hesitation, and then, with the sound of chirping, he quickly walked into the bunker dug in advance beside him.

"Boom!" Amid the deafening sound of cannons, the big iron ball, accompanied by thick smoke, flew out of the muzzle and fell onto the water surface a hundred steps away.

Jiao Yu shook his head: It's too close. Unexpectedly, the cannon cast this time is so powerful! However, it also has to do with the relatively small amount of gunpowder installed.

What Jiao Yu is more concerned about is whether the fine iron is qualified and whether the gunpowder installed has an adverse effect on the barrel.

After the cannon body cooled down, Jiao Yu carefully cleaned the cannon chamber and thoroughly checked: the cannon chamber was intact.

Then he increased the charge and then increased it to three-quarters of the charge. This time he was shot 200 steps away.

It increased again, filled the medicine room, and this time, it ejaculated about four hundred steps.

Although the range is not enough, there is no problem with the cannon body, which proves that this fine iron can meet the needs of making cannons.

"Master, the range is just a little short." Jiao Yu said.

"Raise the muzzle a little higher!" Zhang Yang said.

If there is no air resistance, the best angle is forty-five degrees. However, with air resistance, the range of the artillery should be the farthest when the firing angle of thirty degrees. Now, at most, it is only twenty degrees. Can it be fired further?

This cannot be blamed on Jiao Yu, because it is on the shore and the terrain is tilted downward. Jiao Yu has been busy with cannons, but he has ignored this small problem.

He dug the soil at the bottom of the gun barrel downwards and raised the muzzle. This time, Jiao Yu put in gunpowder and projectiles with confidence, igniting the fuse again.
Chapter completed!