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

While Fang Yuan was cultivating the "Lightning Speed", Guo Xiaofeng was also insisting on speed training.

Perhaps because of the relationship between competitors, Guo Xiaofeng also broke out with great potential.

He lasted for an hour, constantly hitting the speed of sound, and it was not far from breaking through the speed of sound.

Fang Yuan ran back to the speed measurement shed and asked, "How efficient is the lightning speed?" ”

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

0.9% doesn't seem like much, but when faced with a sound barrier, sometimes it's a little bit close, and you can cross it just a little faster.

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

"At a top speed of 1,215 km/h, he's almost over the sound barrier." Chen Likun replied.

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

Guo Xiaofeng has been holding out for an hour, and it is time to rest.

He ran back to the speed booth, took a can of energy drink, and asked as he drank it, "I saw you training at speed just now, how was the effect?" ”

"It's okay, you're almost breaking the sound barrier, congratulations." Fang Yuan said with a smile.

"It's still a little bit closer, and we have to increase the speed by 9 kilometers per hour." Guo Xiaofeng's tone was modest, but his smile was proud.

After all, it is an awakened person who is about to break through the speed of sound, and it is indeed worth being proud of.

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

There is someone chasing after him, who can burst out his potential.

"Take a break, recover your strength, and let's try again." Fang Yuan proposed.

"Okay."

The two sat in chairs, drinking energy drinks while resting, and listened to Chen Likun analyze the data by the way.

"When you reach a speed of 1,191 km/h, you hit the sound barrier. If you don't cross the sound barrier, if you touch the sound barrier, the speed will be reduced to less than 1,191 kilometers per second......

"Therefore, I suggest that you maintain a speed of 1191 kilometers per hour for a short period of time, and then accumulate strength, burst out in an instant, and try to cross the sound barrier within three seconds and soar above 1224 kilometers per hour."

Chen Likun continued to point to the sound barrier data and explained: "In other words, the speed between 1191 kilometers per hour and 1224 kilometers per hour is the sound barrier zone, and in this area, the body will vibrate violently because of touching 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 a 15-minute break.

Guo Xiaofeng finished drinking a can of energy drink, stood up and stretched out his hand towards Fang Yuan, and said, "I'm resting, what about you?" ”

Fang Yuan shook hands with him, asked him to pull himself up, and said, "Let's go!" ”

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

Counting down to the third, the two of them shot out at the same time.

Guo Xiaofeng took the lead on the wall with the linkage of the three abilities and began to gallop on the runway on the wall.

Fang Yuan's speed was not slow, and the boosting and acceleration effect of the "Star Energy Turbine Pneumatic" was gradually exerted to the extreme, following closely behind.

Half a lap later, the two reached 1,191 km/h at the same time.

After touching the sound barrier, neither of them continued to accelerate recklessly, but maintained a speed of 1191 km/h and continued to run.

While maintaining a speed of 1,191 km/h, the two gathered strength and prepared to burst into the form of a burst that would cross the sound barrier.

After Guo Xiaofeng's strength was accumulated, he glanced sideways at Fang Yuan, gave a thumbs up, and said, "I'll go first!" ”

As he spoke, he immediately exploded in speed, soaring up in one go.

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

It's about to break the speed of sound.

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

This is a cloud formed when the air is compressed close to the speed of sound, so that the moisture in the air condenses into a fog.

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

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

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

When his speed reached 1220 km/h, he was about to break the sound barrier, and his body shook more and more violently.

Fang Yuan originally thought that he was really going to break through 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, his steps were chaotic for a moment.

Eventually, his speed began to plummet, from 1,220 km/h all the way down to below 1,191 km/h.

He screamed pity, continued to maintain a speed of 1191 km/h, began to gather strength, and was ready to try again.

Fang Yuan caught up, gave him a thumbs up next to him, and said, "It's my turn." ”

Guo Xiaofeng did not stand in front of the position, moved a position to the outer circle, and gave up the position.

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

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

Bang!

There was a lightning roar in his body, and the speed soared instantly.

1200 km/h!

1210 km / h!

1220 km/h!

When the speed soared to 1220 km/h, Guo Xiaofeng behind him couldn't help but hold his breath.

Because this speed is only a little short of finally breaking through the speed of sound, and just now when he rushed to 1220 km/h, he couldn't hold it up, and the speed dropped.

He has a very complicated heart, he wants to see someone break the speed of sound, but at the same time he wants this person to be himself.

He muttered to himself: Lower down a little, give me another chance.

But.

Fang Yuan didn't give him another chance, and under the "Lightning Speed" with an acceleration efficiency of 116.2%, a violent sound erupted.

Boom!

The sound exploded.

Fang Yuan instantly soared to 1230 km/h, breaking through the speed of sound and triggering a sonic boom.

And that's not all.

After breaking the sound barrier, there is no obstacle to stop the increase in speed.

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

1240 km / h!

1250 km/h!

1280 km/h!

At the time of passing by the speed booth.

Chen Likun stood on the side of the runway and shouted excitedly: "1308 km/h, the speed of sound, you have broken through the speed of sound!" ”

At the moment of breaking through the speed of sound.

Fang Yuan felt very strange, and some of the sounds that he could hear disappeared in an instant.

The intensity of the headwind is like a 100-level typhoon.

If you are an ordinary person, facing the oncoming wind at this speed, your eyes may be blown off.

Fang Yuan was wearing a battle suit and helmet, otherwise his hair might have been ripped off.