The excavator's power motors are two 460 motors and three 130 motors like toy cars.

These motors can work at 7.4V, and in order to pursue high power, Jiang Jiuling can only use five stout No. 1 batteries in series to reach 7.5V.

Jiang Jiuling was about to take out the spare battery in his pocket, but Teacher He Tongxin volunteered to go to the school store to buy the battery.

In less than five minutes, he came back in a hurry, bringing not only a dozen No. 1 batteries, but also a small bucket of sand.

The battery of the excavator is installed on the rotatable working platform above, and the wooden board is removed, revealing the complex motor circuits and batteries inside, which also makes the expression of Teacher He Tongxin on the side instantly complicated and confused.

He thought that it was some kind of finished drive parts that had just come out of foreign countries, but what he saw was a purely handmade style, a mechanical structure with a hard bridge and a hard horse.

The old principal Shi Fengguo coughed again, he asked Jiang Jiuling if he could go out for a while first, he and Teacher He Tongxin had something to say.

Jiang Jiuling spread his hands and said that he could.

......

Only the principal and a physics teacher were left in the office.

This physics teacher is not an ordinary teacher, he is also the head of the science building, and it is said that after graduating from the normal school, he also received three audits of the sacred industrial code.

Of course~

He didn't pass the review of the code to become a titler, otherwise he wouldn't have just mixed up with the status of a class teacher.

The old principal Shi Fengguo gave a general introduction to Jiang Jiuling's situation, and then asked a little undecided: "That kid said that this excavator is its 'achievement', and then wants to use this to study in our No. 1 Middle School." ”

"There are no outsiders here now, Mr. He, what do you think?"

He Tongxin didn't speak, his eyes still on the model of the excavator whose wooden shell had been removed. It wasn't until the principal urged him to react.

"My opinion?" Teacher He Tongxin's expression was a little lost, and he smiled bitterly, "Didn't the principal already tell you my opinion?"

"Of course, he can come to the first middle school, and come to our key class. ”

"Are you sure?" Although the old headmaster also thought that this excavator model was powerful, after all, he studied literature, and he couldn't know how powerful it was.

"You must know that he was expelled from the second middle school, after all, we have to worry about the impact. ”

"If he is not expelled from the No. 2 Middle School, where will we have a chance?"

Teacher He Tongxin criticized mercilessly: "The second middle school is really confused, such an excellent student can be willing to be expelled, I really don't know what they are thinking." ”

"Is it so exaggerated?" the old principal squatted down and looked at the excavator model with interest, digging the sand that Teacher He Tongxin had just gotten, "I admit that he has a strong hands-on ability, and he looks much better than the works made by our students." ”

"But if you look at the structure here, it seems to be some wiring, motors, gears. ”

"It's all uncomplicated stuff. ”

That excavator is still full of iron in its belly!

Because of the identity of the old principal, Teacher He Tongxin couldn't accuse him of saying something wrong, so he changed his way, "Principal, let me say this, this excavator in front of you, don't say that we can't do it in No. 1 Middle School." ”

"Believe it or not, even many people who have just received the title of Holy Industrial Code may not be able to make the excavator in front of them?"

This statement obviously frightened the old headmaster, and he raised his head with such an exaggerated expression.

But the old principal understood that Mr. He Tongxin had been the one who had been exposed to the Sacred Industrial Code three times.

Even though he was not recognized by the legal code in the end, after all, he had dealt with him so many times, and his professional judgment could not be wrong.

Teacher He Tongxin took a look at the closed wooden door of the office, and after confirming that the owner of the excavator would not peek outside, he stopped digging and removed the shell of several pieces of wood on it, revealing the whole picture of the machinery inside.

The more he glimpsed its internal structure, the more Teacher He Tongxin felt that it was extraordinary, "Principal, look at its mechanical arm." ”

"Regarding the working principle of the excavator, I think it is difficult to sort out if I am not engaged in the manufacture of related industries, at least I don't understand it. ”

But the young man outside the door used the simplest motors, gears, and even hand-cut wood straight racks to restore the excavator's movements so clearly. ”

"How did he know this?"

Teacher He Tongxin pointed to the final summary of the complex internal circuits, where there are two remote control modules, "This is removed from the remote control car, I thought it was a special remote control module for excavators launched abroad." ”

Now it seems that he completely transformed these things into the control system of the excavator by hand. ”

"I've never seen anything like it. ”

"Even ...... Even ......"

"Or even what?" the old headmaster became a little serious.

"Even abroad, whether there are similar excavator model toys is up for debate. Teacher He Tongxin carefully closed the wooden shell, and said with some uncertainty: "At least I have never seen a remote-controlled excavator." ”

"If there is no such remote-controlled excavator product. ”

"What does this mean, headmaster, I don't say you understand. ”

The old principal stood up suddenly, and he picked up the phone with a flexibility that was not suitable for this age, "Hey~ Principal Song, I have something to do here, please come over for a while." ”

Principal Song is the vice principal, and he is in charge of teaching materials, equipment and publicity.

Vice Principal Song's office was not far away, and the principal, who was wearing glasses and only a few years older than Teacher He Tongxin, quickly walked over.

He noticed Jiang Jiuling, who was standing outside the corridor and was bored looking at the scenery, and subconsciously thought that it was a student from the school who had caused a big accident that made the principal so serious.

Pushing open the door, the old principal briefly introduced the original situation, and then asked Vice President Song if he had seen a similar remote control model?

Vice Principal Song is in charge of the school's teaching materials and publicity, No. 1 Middle School is the best school in Wucheng, and Wucheng is adjacent to Shanghai, and the cultural exchange between the two regions is very close.

Vice Principal Song's wife is from Shanghai, and he himself also runs to Shanghai every now and then to engage in procurement, and conducts social activities with Shanghai School.

He also has overseas relatives, and he can be regarded as a person with a wide field of vision in the school.

Seeing this excavator model, Vice President Song thought about it carefully for a long time and shook his head and said, "I definitely haven't seen it in China." ”

"Abroad~ My second uncle also brought his grandson back to worship his ancestors at the beginning of the year, my eldest nephew was in his teens, and he brought a lot of toys back, showing off everywhere in front of the younger generations in the family, and also boasted about how many powerful toys there are in Japan. ”

"My nephew probably hasn't seen a remote-controlled excavator before, because my son only pestered me to buy him a remote-controlled car and a remote-controlled model airplane. ”

Vice Principal Song obviously didn't have a good impression of the eldest nephew, and spoke with some disgust.

After further confirming the answer, the old principal decisively made a decision, "We can't guarantee whether there is a remote control excavator abroad, and we need to inquire further, but it seems that there is definitely no one in China." ”

"We're probably going to be famous. ”

"It's sunny outside, Teacher He, call Jiang Jiuling in to go through the admission procedures. ”

......

When Jiang Jiuling came in, he wondered if he was dazzled.

Because he saw a kind smile on the old principal's face, it was like an elder seeing a junior score of 100 points.