Speaking of this, Yuan Fang stopped and looked back, the cannonball was thrown on the beach, usually, there will be many people swimming and catching fish in that place, if someone gets it out and accidentally detonates it, it will be troublesome, and even if that kind of thing doesn't happen, then a big iron ball there is easy to trip people, or kick and hurt toes.

After thinking about it for a while, Yuan Fang still felt that it was better to be safe, so he ordered: "Xiaoyun, Qingru, let's put the last shot, and you go to load the gunpowder." ”

Guan Xiaoyun spread his hands and said, "There is gunpowder, but we don't have any shells." ”

Yuan Fang waved his hand and said: "When I come back, I will have it, none of you should follow me, right Xiaoyun, the muzzle of the cannon is aimed at the sea, and a little more gunpowder is loaded." Guan Xiaoyun and the others were busy preparing, Yuan Fang trotted all the way to the beach, walked into the sea, bent over and groped, and finally found the cannonball that was dropped here.

Sang Rou saw that Yuan Fang had fished up the shells again, and exclaimed, "Brother-in-law, what are you doing?" Put it back. ”

Yuan Fang put his right eye to the place where the cannonball was fused and looked at it, it was so black that he couldn't see anything clearly, turned the cannonball upside down, and poured out a stream of black water, Yuan Fang breathed a sigh of relief, the seawater had penetrated inside, and the gunpowder should not explode again.

Returning with the shell in his hand, he wiped off the seawater on it, found a fuse and inserted it into a small hole and asked, "Ready?" ”

Guan Xiaoyun looked at the cannonball in Yuan Fang's arms, his legs trembled a little, nodded and said, "Accurate, ready." ”

Yuan Fang stuffed the cannonball into the barrel: "Okay, let's ignite." Guan Xiaoyun lit the fuse and ran away with the red clothes, and Yuan Fang followed unhurriedly.

Boom, a cannon sounded, and the shells were thrown far away and fell into the sea in the distance.

Yuan Fang clapped his hands and said, "It's safe now, go, go back." ”

On the way back, Yuzuki was puzzled and asked, "Brother-in-law, why didn't the last shell explode?" ”

Yuan Fang had considered this problem when he was waiting before: "I think it should be too full of gunpowder." ”

The red clothes scratched their heads and said, "Does this have anything to do with how much gunpowder is loaded?" ”

Yuan Fang nodded very affirmatively and said: "Of course it matters, there is a premise for gunpowder combustion, that is, there must be a certain amount of air or oxygen, and the reason why the previous shells can explode is because they are not full, and there is extra space in them, and there is space, which is air, so the gunpowder will burn and then explode." It dawned on everyone.

Yuan Fang continued: "As for why the previous shells will deviate from the track, this is also the reason, after the cannon is discharged, it does not always maintain the previous state, it is round, so it will roll cheaply with the wind resistance and the center of gravity, generating centrifugal force, and the gunpowder in the shell will gather in one direction due to inertia, causing the center of gravity to move sideways, so the shell will change direction." ”

Ye Qingru listened a little big: "Brother-in-law, according to what you say, the gunpowder in the shell can't be filled, otherwise it won't explode, but if it is not filled, it will miss the shot, so how can these two problems be solved?" ”

Yuan Fang spread his hands and said: "I don't know, go back and think about it, there will always be a way." ”

Leaving the beach, Yuan Fang went straight to the blacksmith furnace, found the bearded blacksmith, and asked him to re-modify the mold of the shell, not all modifications, only modify the fuse tube on the extended lid, Yuan Fang analyzed, the length of the fuse tube is enough to control the explosion time of the shell, before the fuse tube was too short, the shell exploded before it landed, if the length of the fuse tube is just right, you can control the shell to explode in a short time after landing.

This small modification was not difficult, and the bearded blacksmith promised to complete it within an hour and start making a new batch of shells.

Guan Xiaoyun was quite familiar with this blacksmith, and when Yuan Fang was talking to the bearded man, this thing ran to the blacksmiths who were working, especially a few young hands, to brag about the power of the cannonball, and the red clothes were as if they had never seen a cannonball explode, and they were very cooperative.

After finishing the business, Yuan Fang beckoned Guan Xiaoyun, who wanted to stay here and be lazy, to go back with Hongyi, the two guys really wanted to be lazy, and now they were named, so they had to reluctantly say goodbye to the blacksmiths, making it seem like going to the execution ground, so angry that Yuan Fang only jumped to his feet.

Back in the studio, everyone sat down, Yuan Fang knocked on the table and said, "Okay, be quiet, be quiet, be quiet, Xiaoyun, Hongyi, don't mutter, let's talk about it, is there any good way?" ”

Hongyi pouted and said, "Haven't you already thought of a way?" ”

Yuan Fang was stunned: "When did I think of a way?" If I have a way, do I need to ask you for help? ”

The red clothes retorted: "Didn't you just tell the bearded man that you wanted to change the shell cover?" ”

Yuan Fang patted his head: "I'm not talking about when the shell will explode." ”

Guan Xiaoyun asked inexplicably: "What else is the problem?" ”

Yuan Fang glared and said, "I said that you two are not intentional?" ”

The red-clothed traitor smiled and whispered to Guan Xiaoyun beside him, "It's over, it's been discovered." ”

Guan Xiaoyun said with an innocent face: "No." ”

Yuan Fang glared at Guan Xiaoyun and Hongyi fiercely, and said to someone who said, "Think about it, how can you fill the explosives and then leave enough burning air in the place where the fuse is fused?" ”

Sang Rou first expressed her opinion: "Brother-in-law, can you add a hollow glass ball to the cannonball?" Wouldn't that be the air? ”

Without waiting for Yuan Fang to speak, Hongyi shook his head and said negatively: "I have thought about this method, but it seems that it will not work." ”

Sang Rou and Yuan Fang said in unison: "Why? ”

The red coat gestured and said: "You think, how brittle the glass is, if that is the case, the shell can indeed store a certain amount of air in it before it is fired, but you can also see how violent the vibration is when the shell is fired, the glass can't withstand it at all, it will definitely break, in that case it is no different from less gunpowder, and the shell will still deviate from the track because of that centrifugal force." ”

Sang Rou suddenly came to her senses, nodded her head again and again, and said, "Hongyi is so smart, you can think of this." The red clothes proudly raised their little heads, looking invincible.

Jieyue asked Yuan Fang: "Brother-in-law, how much air does it take for gunpowder to burn?" ”

Yuan Fang was stunned, how could he know about this thing, after thinking for a while, Yuan Fang scratched his head in embarrassment and said, "This, I don't know very well, it shouldn't be much needed." ”

Yuyue made a slight modification according to Sang Rou's ideas, and thought of a solution: "Brother-in-law, if you don't need much air, can you change the glass to wood?" ”

Yuan Fang asked suspiciously: "How to change?" ”

Yuzuki took a wooden stick from the workbench, and found a cannonball lid in the box to compare and said, "We can make a wooden wedge, and we want a hollow tube, that is, insert it from the fuse tube, the top is thinner, used to fix the fuse, and the bottom is thicker, so that a certain amount of air can be preserved." ”

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