2 hours later, Iron-Dragon Airboat penetrated through a thick cloud which was as thick as huge cotton candy. In less than 1 minute, Zhang Tie had already left Iron-Dragon Airboat and appeared in the cloud which was tens of thousands of meters high in the sky.
Based on the high speed of Iron-Dragon Airboat, they had already left the territory of Longxi Prefecture, Zhongzhou Province.
At this moment, it might be rainy in Pingsha Valley; however, it was sunny here. White clouds were floating in the sky. Airships would fly by below the clouds from time to time. A prosperous city was looming on the horizon in the far.
There were secret tunnels in each room of Iron-Dragon Airboat for knights to access to Iron-Dragon Airboat rapidly for escaping and executing special tasks. These secret tunnels could only be opened from inside. After being opened for a few seconds, they would be closed automatically. One of the secret tunnels was in Zhang Tie's cultivation room. Nobody else knew that Zhang Tie came out of the secret tunnel except for Bai Suxian.
White clouds swirled around them, and visibility within the clouds was less than a hundred meters. The people outside could not see what was in the clouds at all. Being in the clouds and riding the wind, they felt like they were floating in the air, giving off the feeling of immortals.
Zhang Tie had to admit that after leaving Iron-Dragon Airboat alone, he could do whatever he wanted. He had not felt so relaxed for a long time.
Over these years, Zhang Tie was either escaping or thinking about how to clear his grievances or fighting constantly. It felt really good to act alone once again.
Zhang Tie waited in the white cloud for over 10 minutes. When Iron-Dragon Airboat completely disappeared in the skyline, Zhang Tie had already turned into a common middle-aged man in blue long gown with thick eyebrows and a dark face. His battle strength and qi also became chaotic and unpredictable. Zhang Tie could barely identify his real battle strength.
After doing all this, after confirming that there was no knight or airboat within dozens of miles, Zhang Tie flew out of the clouds and turned into a small dot in the sky as he flew towards the north. Meanwhile, he was getting higher and higher.
Zhang Tie sensed that the thunder hawk seemed to be very excited when it sensed that Zhang Tie was flying towards it. Its flight speed increased by almost 30%, which startled Zhang Tie. Closely after that, Zhang Tie felt deeply moved.
This was the feeling of watching a puppy that he had raised leave him for several years, and when it grew up and saw him again, it desperately wagged its tail and ran towards him.
At this moment, Zhang Tie's speed was not slow either. Only after a few seconds, Zhang Tie's flight speed had already broken 900 miles per hour. Additionally, he kept increasing his speed. In the blink of an eye, he had already entered the stratosphere which was over 20 miles above the ground. When a knight flew in the stratosphere at such a high speed, it could barely be discovered by people on the ground.
After entering the stratosphere, Zhang Tie was still rising while his speed had already broken 1,000 miles per hour.
The two chakras of his King Roc Sutra were running deeply and forcefully. They were as heavy as mountains and extremely stable like a high-efficient and surging engine which had just entered the working speed range. The running chakras not only offset the gravity of the earth, but also enabled Zhang Tie to break out a greater speed. He had an impulse to fly higher and faster.
After sensing this impulse carefully, Zhang Tie was amazed to find that 1/3 of this impulse came from his curiosity while the other 2/3 came from his instinct of running the chakra of King Roc Sutra.
In this age, all the human aircrafts, airships and gliders flew in the troposphere within 20 miles above the ground; however, airboats and knights could enter the stratosphere which was between 20 miles and 130 miles above the ground. Zhang Tie had not experienced the situation in the other atmosphere; neither had he heard about it from other earth knights. Therefore, he was curious about it.
The instinct of King Roc Sutra was a bit strange. Zhang Tie admired the terrifying flight speed of the thunder hawk. Closely after that, Zhang Tie felt that the virtual image of King Roc Sutra which was always hidden in the Shrine became a bit restless. It was very strange.
Driven by this curiosity and the instinct of an emperor-level secret method, plus the suitable time and place, Zhang Tie had a lofty aspiration. He wanted to test the limit of his flight speed.
Since he promoted to an earth knight, Zhang Tie had not had a chance to try this ability.
When Zhang Tie thought about it, he constantly raised his body and accelerated his speed once again. He broke through the limit of 1,100 miles per hour for the first time. At this speed, Zhang Tie soon reached the top of the stratosphere over 130 miles above the ground.
At this height, the air was thinner while there was a sea of white clouds under their feet. They felt like looking at a cotton field from the top of a skyscraper. In the vision of commoners, except for some very huge objects such as cities, mountains, lakes, and long railways, which occasionally exposed a bit of silhouette under the cotton field, it was almost impossible for them to notice anything on the ground below the cotton field.
Of course, it was true for commoners; however, for Zhang Tie who had lotus-flower eyes, the higher he flew, the better his vision would be. Even at such a height, as long as he wanted and concentrated, he could clearly see each grasses and wood on the ground.
When he recalled the reconnaissance satellite before the Catastrophe, a hilarious whim occurred to Zhang Tie, 'Compared to those metal instruments, it seems that I'm the real "artificial satellite".'
Zhang Tie didn't know why the other earth knights rarely mentioned the atmosphere above the stratosphere. At least in his opinion, it was not difficult for him to break through the stratosphere. His sense and the normal operation of his chakras had given him great confidence.
Almost without any obstacle, Zhang Tie instantly reached the atmosphere above 130 miles above the ground. The first feeling he had was cold; the second feeling was that the convective movement of airflow in the troposphere reappeared; the third feeling was that an invisible barrier appeared in front of him for the first time when his flight speed was over 1,200 miles per hour …
'Sound barrier' occurred to Zhang Tie's mind. (To be continued.)
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