Due to the cancellation of the model aircraft class in the second semester of the fifth grade, the practice on weekends is basically to run to the big runway in the center of the city or the runway of the four-wheel drive store in several large shopping malls for practice, and the runway in these places is generally not very difficult, so the effect is not very good, and the effect of the shock motor cannot be completely verified.

However, in this process, Xiao Zhen also gradually felt the rhythm of the motor, indeed, the entire performance of the shock motor is more than one step better than the previous black motor and fire motor. Looking at the envious gazes cast by the children around him when he practiced in the mall and the city center, Xiao Zhen felt a sense of accomplishment. Of course, Xiao Zhen still doesn't understand that this cheap vanity actually means little.

So for the preliminaries, Xiao Zhen is actually very confident.

The track for the preliminaries was installed in the music classroom. The day before the game, after coming to the competition venue to collect the spot, Xiao Zhen and Xiao Jie discussed:

"This runway has a lot of curves, and I'm going to use Hot Wheels or Spitfire Meteors. Xiao Zhen said.

"Haha, Hot Wheels is too light, aren't you afraid to fly out. Xiaojie said.

"Just set the angle, and the half-grip direction is fine. Xiao Zhen said.

"I still use the big ball guide wheel, and the performance is stable. Xiaojie said.

"Then I still recommend that you bring a toolbox, and it is convenient to change the guide wheel at any time when the time comes. Xiao Zhen said.

"You have to be improvised, why don't you practice assembly. If one set of equipment can be perfect for any track, then it's boring. Xiaojie said.

"We'll see. The two clasped their hands into fists and went home separately.

As soon as he got home, Xiao Zhen immediately took off all the ball guide wheels on the phoenix tail of the mini four-wheel drive FRP faucet and replaced them with Hot Wheels guide wheels. At the beginning, it was prepared to install four guide wheels in the front and four in the back. However, at this time, Xiao Zhen suddenly remembered that Mr. Wen once said that the back of this guide wheel is generally heavier than the front in order to stably hold down the car and prevent it from flying off the runway. The Hot Wheels guide wheels are very light, and it seems that you can often see a lot of Hot Wheels flying out when you are training. So, Xiao Zhen took down the two rows of Hot Wheels guide wheels in the back, and added two large ball guide wheels at the bottom to increase the grip of the whole car by increasing the weight.

As a result, the front four hot wheels guide wheels, the back six guide wheels are divided into the upper four hot wheels with the two ball guide wheels below, and the state of the two ball guide wheels has been adjusted by the small truth. Because it is set as a tail six guide wheels, the stability of the whole car has been improved a lot in the eyes of Xiao Zhen.

However, after reading it, Lao Wu felt that it was unscientific. In Lao Wu's view, this kind of tail six guide wheels will only affect the speed, because the original intention of the Hot Wheels is to reduce the weight of the car and improve the performance of cornering, and the extra bottom large ball guide wheels will affect this effect. However, in the end, Lao Wu still couldn't change Xiao Zhen's opinion, after all, things like the guide wheel can also be adjusted during the game, and then you can slowly adjust it depending on the situation of other players.

So, on the day of the competition, Xiao Zhen took the toolbox and came to the school happily with the mini four-wheel drive car that had been basically debugged. As soon as he arrived at the class, Xiao Zhen found that everyone was already surrounding Xiao Jie and Xiao Jie's mini four-wheel drive car with a whirlwind charge shell. Seeing that Xiao Jie has been bragging about how powerful the atomic fission motor is, Xiao Zhen is naturally smiling. However, soon there was a group of people around Xiao Zhen's side, and everyone was surprised to see Xiao Zhen's Devil Commander.

Zhang Long touched the front of the little real devil commander and said, "Can this also stick out like a thorn in the TV?"

"It's so good, I'm a world champion. Xiao Zhen said.

So everyone compared the real car with Xiaojie's car.

And in the end, with the impression of cartoons, everyone generally thinks that Xiaojie's car will be stronger. Of course, the practice matches between the two have been almost evenly matched, after all, the rotational speed of the atomic fission motor and the shock motor is actually about the same.

Because it was before the game, Xiao Zhen was very excited, so he didn't listen to much of the class this day, and all his thoughts were on the track of the music classroom on the top floor of the school all day, and Xiao Zhen kept simulating the plot of the game in his mind.

After six classes, it was finally time for the competition, and Xiao Zhen was even more excited. Naturally, at this time, Xiaojie was also gearing up. However, because Xiao Hao hadn't come to school during the day that day, the two couldn't help but be a little disappointed. After all, on the phone, Xiao Hao said that he was going to come to the competition. But it's been almost a day, and Xiao Hao's shadow hasn't appeared in the class. And without Xiaohao's 212 mini four-wheel drive car, there is one less Three Musketeers.

However, after the two climbed the stairs, they found that Xiao Hao was already waiting for everyone inside. It turned out that Xiao Hao was going to be the first to play in the next game, and he had to go home after the game. The two rushed forward to say hello to Xiao Hao. After confirming that Xiao Hao's state had recovered, the two immediately sat happily on the side, excitedly waiting for the start of the game.

"What do you think Xiao Hao can run?" Xiao Zhen said.

"I don't know, but I see that he is in good shape, and he should have a good result. Little Brave said.

"There are four hot wheels in front and back, which is perfect for this kind of corner. Xiao Zhen said.

"That's right, but it's easy to get off the runway. Little Brave said.

As the players entered, the classroom became more and more lively, and the atmosphere became more and more intense.

"Haha, this also uses aluminum alloy faucets and phoenix tails directly in the car. Xiaojie looked at some cars and said.

"Don't underestimate these people, have you forgotten, didn't you be defeated by a man who only installed an aluminum alloy faucet one day. Xiao Zhen said.

"Don't tease, it's just that my battery is dead, and the final speed is about the same as your black motor, okay, don't you uncover my scars at every turn?"

"Okay, just don't talk about it. By the way, did you change the carbon brush? Xiao Zhen said.

"In the final, I changed it again. This preliminary round doesn't need to be too aggressive. Xiaojie smiled mysteriously.

"Cut. Xiao Zhen said.

"Everyone, be quiet, everyone, our game is about to start. We're about to start our game. At this time, a voice came from the stereo, and when they looked in the middle, they saw a man and a woman standing in the middle of the track, and both of them were school physical education teachers.

Everyone slowly quieted down, but the atmosphere seemed to be getting more and more enthusiastic, so the host's long speech was drowned in this lively atmosphere. However, in the end, the last few important words said by the host still made everyone very excited - "I announce the official start of the fifth mini 4WD competition of our school!"