In the next hour, Fang Yuan improved the acceleration efficiency of "Lightning Speed" through practice.

When Fang Yuan was practicing "Lightning Speed", Guo Xiaofeng was also insisting on speed training.

Perhaps because of competitors, Guo Xiaofeng also exploded with great potential.

He persisted for an hour, constantly impacting the speed of sound, and it was not far from breaking the speed of sound.

Fang Yuan ran back to the speed test booth and asked, "How efficient is the lightning speed?"

"116.2%, an increase of 0.9%, growing very fast!" Chen Likun's voice was very excited.

0.9% doesn't seem to be much, but when facing the sound barrier, sometimes it's a little bit worse, as long as it's a little bit faster, you can cross it.

Fang Yuan pointed to Guo Xiaofeng on the runway and asked, "What about him?"

"With a top speed of 1215 km/h, he is almost over the sound barrier." Chen Likun replied.

Fang Yuan gestured to Guo Xiaofeng on the runway to stop him.

Guo Xiaofeng has persisted for an hour, and it is time to rest.

He ran back to the speed test booth, took a can of energy drink, and asked as he drank it, "I just saw you training at speed. How effective is it?"

"It's ok, you are about to break the sound barrier, congratulations." Fang Yuan smiled.

"It's almost a bit. The speed has to be increased by 9 kilometers per hour." Guo Xiaofeng's tone is humble, but his smile is proud.

After all, he is the awakened person who is about to break through the speed of sound, so he is indeed proud.

"What about you, is the speed training over? Do you want to do it again?" Guo Xiaofeng likes this kind of training with competitors.

Someone catches up behind him and can explode his own potential.

"Take a break, regain strength, let's try again." Fang Yuan suggested.

"Okay."

The two sat in chairs, drinking energy drinks and resting while listening to Chen Likun's analysis of data.

"When the speed reaches 1191 kilometers per hour, the sound barrier will be touched. If you don't cross the sound barrier, once you touch the sound barrier, the speed will be suppressed below 1191 kilometers...

"So, I suggest that when you are at a speed of 1191 kilometers per hour, you should maintain a short period of time, then accumulate your strength, and burst out in an instant. Try to cross the sound barrier within three seconds and reach the speed of 1224 kilometers per hour."

Chen Likun continued pointing to the sound barrier data and explained: "In other words, the speed is between 1191 kilometers and 1224 kilometers per hour, which is the sound barrier zone. In this zone, the body will vibrate violently because of the sound barrier...

"So, don't let the speed stop between 1191 and 1224, either stay below 1191 or rush up to 1224 km/h in one go."

After 15 minutes of rest.

Guo Xiaofeng finished a can of energy drinks, stood up and stretched out his hand towards Fang Yuan, saying: "I'm resting well, how about you?"

Fang Yuan shook hands with him, let him pull himself up, and said, "Go!"

The two again stood on the starting line of the speed training ground.

With three countdowns, the two shot out at the same time.

With the linkage of the three abilities, Guo Xiaofeng took the lead on the wall and began to sprint on the wall runway.

Fang Yuan's speed is not slow, and the boosting and acceleration effect of "Star Energy Turbo Pneumatic" is gradually brought into full play, following closely behind.

After half a lap, the two soared to 1191 km/h at the same time.

After touching the sound barrier, neither of them continued to accelerate recklessly, but kept running at a speed of 1191 km/h.

While maintaining the speed of 1191 km/h, the two gathered their strength, prepared for the explosion, and prepared to cross the sound barrier through the explosion.

After Guo Xiaofeng had accumulated his strength, he glanced sideways at Fang Yuan, compared with a thumb, and said, "I'm leaving now!"

As he spoke, he immediately exploded in speed, rushing up the speed in one breath.

1200km/h, 1210km/h, 1220km/h...

Seeing to break the speed of sound.

Fang Yuan had already seen a very thin sonic cloud appearing on his body.

This is the cloud formed by compressing air at close to the speed of sound, causing the moisture in the air to condense into mist.

As Guo Xiaofeng tried to break through the sound barrier, his body began to shake violently.

The greater the shaking, the greater the pressure on his body.

Therefore, in this process of crossing the sound barrier, the shorter the time, the better.

When his speed reached 1220 km/h, he was about to break through the sound barrier, and his body jitter became more and more severe.

Fang Yuan originally thought he was really going to break the speed of sound.

But at the last moment, his speed slowed down and he couldn't continue to accelerate, and even because of the shaking of his body, there was a momentary confusion in his steps.

In the end, his speed began to drop sharply, from 1,220 km/h, all the way to below 1,191 km/h.

He whispered a pity, continued to maintain the speed of 1191 km/h and began to accumulate strength, ready to try again.

Fang Yuan caught up with him, held a thumbs up to him beside him, and said, "It's me."

Guo Xiaofeng didn't stand in front of the card, but moved one position outward to give up the position.

The two are now comparing who breaks the speed of sound, so it makes no difference who runs ahead.

After he gave up his birth position, Fang Yuan took a deep breath, exploded the "Lightning Speed" and "Star Energy Turbo Pneumatic" to the extreme, and instantly accelerated forward sprinting.

Boom!

There was a thunder of lightning in the body, and the speed surged instantly.

1200 km/h!

1210 km/h!

1220 km/h!

When the speed reached 1220 km/h, Guo Xiaofeng behind him couldn't help holding his breath.

Because this speed is only a little short of the final breakthrough of the speed of sound, and when he rushed to 1220 km/h just now, he could not hold it and his speed dropped.

His heart is very complicated. He hopes to see someone break the speed of sound, but at the same time he hopes that this person is himself.

He muttered in his heart: Come down a little bit and give me another chance.

but.

Fang Yuan didn't give him any more chance, and then hurriedly under the "lightning speed" of 116.2% acceleration efficiency, there was a violent shock.

Bang!

The sound exploded.

Fang Yuan soared up to 1,230 km/h instantly, breaking the speed of sound, causing a popping sound.

Not only that.

After breaking through the sound barrier, there are no obstacles to stop the speed increase.

Fang Yuan's speed began to enter a new round of rapid hurricane.

1240 km/h!

1250 km/h!

1280 km/h!

When passing through the speed test booth.

Standing on the side of the runway, Chen Likun exclaimed excitedly: "1308 km/h, the speed of sound, you have broken the speed of sound!"

At the moment of breaking through the speed of sound.

Fang Yuan felt very peculiar, and some of the sounds that could have been heard disappeared instantly.

The intensity of the oncoming wind is like a hundred-level typhoon.

If it is an ordinary person, facing the oncoming wind at this speed, the eyes may be blown off.

Fang Yuan was wearing a battle suit and helmet, otherwise his hair might be torn off.