Boom! Boom! Boom......

There was a constant boom in the sky.

Fang Yuan continued to test the lightning vortex ring, familiar with this terrifying thrust.

"This thrust is greater than I imagined, and if I hadn't absorbed the Aether Dragon's blood, I wouldn't have been able to withstand it." While testing, Fang Yuan communicated with Professor Yang Yuping on the ground.

"Of course, if the lightning vortex ring is compressed to the limit, it will be a small nuclear explosion. Of course, the level of compression is not yet to the level of a nuclear explosion, but you can imagine how powerful it is. To put it simply, if you don't have the protection of a strong interaction force, you can't withstand this thrust in the early stage. Yang Yuping replied.

Boom!

Fang Yuan adjusted the thrust direction of the lightning vortex ring by adjusting the position of his feet, and used the powerful explosive thrust to make a lightning turn in the air.

At the moment when the lightning vortex exploded, it was like stepping on the ground with "lightning speed", as if stepping on the physical ground.

After becoming familiar with the propulsion of the Lightning Vortex Ring, Fang Yuan began to use the Lightning Vortex Ring on his feet.

In the end, relying on the lightning vortex ring, the effect of running in the air was achieved.

"Now let's see if we can get up to the stratosphere." Yang Yuping commanded.

Fang Yuan turned his direction, facing the sky, and a lightning vortex ring erupted.

Boom!

A flash of lightning roared, and the "black dragon" shot straight into the sky like a rocket.

It took only 25 seconds to break through the troposphere and enter the stratosphere at a distance of 15 kilometers.

"I'm already in the troposphere, and I'm going to continue to rush upwards and look through the ozone layer." Fang Yuan took the initiative to ask.

"Yes, but pay attention to the oxygen supply and return immediately if there is a lack of oxygen." Yang Yuping agreed to this request, and then gave another instruct.

"Okay."

Fang Yuan continued to erupt into a lightning vortex ring, sprinting upward, penetrating the ozone layer in an instant, reaching an altitude of 30 kilometers above the ground.

Flying outside the ozone layer and looking at the clouds below is amazing.

In general, an ordinary aircraft will only fly at a distance of 10 kilometers from the ground, and rarely exceed 10 kilometers.

Fang Yuan looked up at the sky, and suddenly wanted to try the limit, so he asked, "Can I fly out of the atmosphere and try it?" ”

"It's better not to, the black dragon armor has not done this test, and flying out of the atmosphere, there will definitely be a lack of oxygen, although the suit has an oxygen supply system, but ......" Yang Yuping did not approve of this proposal.

"Has the Red Dragon General flown out of the atmosphere?" Fang Yuan asked again.

"This ......" Yang Yuping was speechless for a while.

Admiral Rhodes took over and replied, "Flew out." ”

Fang Yuan thought for a moment and said, "According to the power principle of the lightning vortex ring, it can actually fly in space, right?" ”

"Theoretically, this is true, but this is the first time that the Black Dragon Warframe has been tested, and there are still many things that need to be optimized and improved, so don't make such a dangerous move......"

Yang Yuping objected, and took the red dragon armor as an example: "The dragon series armor is not finalized at one time, and the red dragon general's red dragon armor will be repaired and optimized every time the battle ends. The Black Dragon Warframe also needs to go through this process in order to become a perfect set of Warframes. ”

"In fact, according to my ability, even if I am drifting in outer space, I have the ability to return to Earth, and even if I can't come back, I can survive for a long time, and there is actually no danger. Since you want to test, you should test the limit. As he spoke, Fang Yuan activated the lightning vortex ring and rushed towards the outside of the atmosphere.

Boom!

The speed soared again, sprinting out of the atmosphere.

The people on the ground could no longer see the shadow of the black dragon battle armor, and could only see Fang Yuan's location through the signal transmitted back by the electronic communication equipment.

"Young people are frizzy, how can they do such a dangerous thing for the first test?" Yang Yuping was a little annoyed.

According to his experimental habits, the first test should be carried out in the smoothest way, and such a dangerous attempt must not be made.

"It's not too dangerous for him, and even if this kid gets lost in outer space, there are actually people who can drag him back, so there's no need to worry too much." Admiral Rhodes smiled and comforted.

Both of them are a lot older, but their personalities are very different.

The reason is also very simple.

Yang Yuping is a scientific research worker, and everything is based on stability.

Admiral Rhodes is a combatant and never lacks an adventurous spirit.

Therefore, if there is no order from a senior general, he will test the Black Dragon Battle Armor instead, and it is estimated that he will also want to fly out of the atmosphere to try.

……

After 30 seconds, Fang Yuan rushed out of the troposphere and into the middle layer.

After 50 seconds, Fang Yuan rushed out of the mesosphere and into the ionosphere, 100 kilometers above the ground.

Twenty minutes later, Fang Yuan rushed out of the ionosphere and into the outermost layer of the atmosphere, 800 kilometers above the ground.

Another 5 minutes later, Fang Yuan rushed out of the atmosphere and into space, 1,000 kilometers above the ground.

In fact, 99% of the atmosphere is within 100 kilometers, and the ionosphere has very little atmosphere, which can already be considered space if it is not so strict.

Moreover, there are already satellites at a distance of 300 km from the ground.

"It's okay, it's okay to get to that location. Fly any further and you'll be out of Earth, come back quickly. In case you reach escape speed and the Lightning Vortex engine is damaged, you really can't come back. ”

Yang Yuping's eager voice came from the intercom, and his anxiety could be heard from his voice.

Fang Yuan was in space, and he could already see the satellite with the naked eye, which felt very amazing.

"Quickly check the situation of the Black Dragon Warframe, and come back when you have had enough." Yang Yuping kept urging.

"Okay, I see, everything is in good condition now, there are no problems."

Fang Yuan replied, and suddenly thought of another idea, and said, "Professor, why don't you test the limit speed and see what speed you can get when you dive down from space." ”

"Can you get back to the ground first?" Yang Yuping was really exhausted by Fang Yuan's whim.

"Actually, I don't think it's okay even to reach the limit speed, so let's give it a try." Fang Yuan proposed.

"I don't agree, won't you try?" Yang Yuping already felt a little powerless.

"Then I'll get started."

Fang Yuan said as he began to start the Lightning Vortex Ring Engine and swooped towards the ground.

Under the dual effect of engine thrust and the gravitational pull of the earth, the speed began to soar, breaking the speed of sound in an instant.

However, breaking through the tight speed of sound is only the beginning.

Speeds continue to soar, Mach 1, Mach 2, Mach 3......

Yang Yuping and the scientific researchers next to him all swallowed a mouthful of saliva involuntarily when they saw the speed displayed on the communication equipment.

"Mach 4, it seems to be still accelerating." Da Liu was a little excited.

Yang Yuping hurriedly reminded: "The temperature of the battle suit, if there is an unbearable situation, stop it immediately." ”

This speed is already about the same as that of an intercontinental missile, and if it continues like this, the temperature generated by friction with the air can even exceed 1,000 degrees.