Siheyuan: Xu Damao, I want to go to the moon

Xu Damao had no idea about this. He thought that he would first use a small steel pipe to explain the electromagnetic drive principle to everyone and do a small experiment.

It is totally impossible to achieve the effect of firing like a cannonball.

Electric energy, batteries, instantaneous discharge power, material strength and bearing capacity, etc., he cannot come up with the basic industrial system in this era, especially in China.

Xu Damao felt thankful that he could achieve the same slingshot effect as those played by primary school students.

Just do some physics experiments for fun.

But I didn’t expect that Section Chief Huang was really serious about it and ran over excitedly.

"No, Old Huang... your Propaganda Department? What does the Propaganda Department need artillery for?"

"Let's play!"

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Then, the factory managers and even the national security department were alarmed.

In 1959, at the end of September, various cultural activities were in full swing in the city, just waiting for the National Day, the 9th anniversary of the founding of the People's Republic of China, the parade, and the military review.

This is the most tense time for the National Security Department of the police station. As the chief of the Propaganda Department, you are not writing those fancy articles or making slogans for activities, but you come to me and say you want to play with cannons?

Can I use you as a cannonball and shoot you out?

Then--

Old Huang was very frightened, Xu Damao was also confused, and all the staff in the Propaganda Department were under surveillance.

Steel rolling mill, Propaganda Department, want to make cannons?!

Or is it to build the electromagnetic cannon that has caused a sensation internationally?

Tell me, is there a spy among you?!

Xu Damao was so sad that he wanted to cry but had no tears. What on earth was going on?

I just said a few words and Lao Huang went to get the materials. Even if you wanted to do it for fun, why didn't you tell me first?

There's no need for a cannon barrel, this is just an experiment!

Then, Xu Damao was forced to conduct the electromagnetic gun experiment in front of everyone.

Fortunately, he has the basic theoretical knowledge, and the system will explain it to him in a simple way.

"Electromagnetic guns, to put it simply, are divided into coil guns and electromagnetic rail guns."

"Let's demonstrate the coil gun first..."

Xu Damao was forced to lead everyone to the speaker factory. Why are they here?

Because we make speakers here, there are a lot of magnets.

So in the test room, there is a wooden track in the middle with a groove in the middle, which is the trajectory.

On both sides of the track are various magnets from small to large, which are clamped on both sides by magnetic force.

Then Xu Damao placed a steel ball at the front end of the track, and as soon as he loosened his hand, the steel ball bounced out.

But due to the magnetic force, it didn't run very far and stopped at the end of the track, at the largest magnet.

"Is this thing a rail gun?" Factory Director Yang, Secretary Nie, Li Huaide, Section Chief Xie, and the comrades from the National Security Bureau were stunned. Isn't this just a magnet attracting iron?

The orbital cannon that the Russians and Americans are talking about is a high-tech and powerful weapon that can be used in space to directly strike satellites four or five thousand kilometers away from the moon!

Are you, Xu Damao, fooling us?

Tell the truth!

Xu Damao really wanted to curse, but the investigation of spies had led to his head, and he had to explain himself clearly.

"Wait, this is just a demonstration of a principle. Now let's make an electromagnetic coil gun."

Since you want to watch it, I will risk my life to accompany you. It's just a high school physics experiment anyway, and it won't cause much harm.

To put it bluntly, it's not even as destructive as a monkey's rubber band slingshot.

So, he found a lot of enameled wire and directly wound a very long and large electromagnet.

The wooden stick in the middle used as the axis was pulled out, and then the electromagnet was wrapped with insulating electrical tape.

The two sections are connected to a wooden block that looks like a "switch", with a safety device in the middle.

Xu Damao cut a lot of tin foil strips, which are equivalent to fuses, the kind of disposable fuses.

The two ends of tinfoil are pressed with an iron ball so that the tinfoil can be replaced at any time if it burns.

Then connect the circuit switch and the voltage regulator gate. As soon as the switch is turned on, the electromagnet will generate huge electromagnetic force, and the tin foil will burn immediately. This is a disposable fuse - safe.

Next, Xu Damao found a plastic tube, inserted it into the empty central axis of the electromagnet and fixed it, and placed a steel ball at the front end.

Four or five meters away, Xu Damao also placed a target - a soda bottle.

After everything was ready, Xu Damao said to everyone mysteriously:

"Now, it's time to witness a miracle!"

Everyone was also very nervous, looking at this simple equipment.

Xu Damao pushed the gate upwards, and instantly a spark flashed -

--boom--

The soda bottle over there lived up to everyone's expectations and was broken by the steel ball. Fortunately, the power was still sufficient and did not embarrass Xu Damao.

The tin foil in front of him was burned up in the flash of lightning.

Everyone was stunned for a long time, and finally the comrade from the National Security Bureau said silently: "Is this the electromagnetic railgun?"

"That plastic tube is the track?"

Xu Damao nodded: "Yes, this is a small experiment. Just think about it, if the current is stronger, the shell is bigger, and the track is longer, then this is an electromagnetic railgun!"

Everyone was still in a daze, feeling as if their IQ was being crushed or underestimated.

Just for a thing that is not even as lethal as a monkey's rubber band slingshot, why did they mobilize so many troops?

Aren’t we too idle?

"Didn't you say this was a coil gun?"

"Yes, the basic theory is the electromagnetic thrust generated instantly by the electromagnetic coil."

"But if we replace it with two rails and use the potential difference to push it, the effect will be better." Xu Damao quickly explained.

"You can do it, too?"

"Then I can't do it. I just know the theory." The theory of the electromagnet coil gun is still understandable, but the potential difference rail gun between two rails is completely unclear.

"Why do you know so much? Tell me, have you had any contact with foreign forces?" The national security comrades did not give up and continued to interrogate. At this time, they would rather kill the wrong person than let him go!

"Brother, this is a high school physics experiment!"

“That’s how these speakers are made!”

"A speaker is also an electromagnetic cannon?" Oh my god, this is a speaker factory, could it also be a weapons production center? !

This matter is even bigger!

Damn it - Xu Damao was going crazy, so he had to take apart a subwoofer in front of everyone and explain to everyone while looking at the electromagnet coil at the vibrating point of the middle paper plate.

"When there is electricity, the tube is pushed up by electromagnetic force."

“There’s no electricity, so it comes down.”

"Up and down, that's a rapid vibration."

"There's a paper plate on top, and when it vibrates, there's a sound."

"Everyone, understand?"

If he still couldn't figure it out, Xu Damao was going to go to Beihai Park and dance with the speaker in his arms.

It's so hard for me!