This feeling was amazing, and it reminded Yang Jing of the first time he used the restricted-level time travel skill.

George's voice rang out again: "Boss, how do you feel? I mean you don't feel any discomfort, right? It's Mach 1.05, which is close to the speed of sound at sea level. Of course, if you want to go faster, you can do that, but you need to climb a bit, the air is still too dense at this altitude, and we have to go higher to continue to increase the speed. ”

"I'm fine, it's just that it's a strange feeling, I was making a fuss just now, and now I can't hear anything. ”

"Haha, that's it, as long as you fly at supersonic speeds, you can always experience this magical feeling. BOSS, sit tight, I'm going to start climbing. ”

As he spoke, George pulled the lever slightly, and the plane began to climb at a relatively small angle. In supersonic flight, there is no way to make a sharp turn or pull up and down, so George can only climb in a relatively gentle way.

A few minutes later, the altimeter showed that it had reached an altitude of 39,000 feet, or about 11,887 meters.

The F15D has a maximum climb altitude of 19,800 meters, so it is still very easy to fly at an altitude of less than 12,000 kilometers.

And at this time, when the plane entered horizontal flight, within a few minutes, the speed of the aircraft had increased to Mach 2.

That is, at this altitude of 12,000 kilometers, the speed of this F15D at this time has exceeded 2,100 km / h.

The height of 12,000 meters has exceeded the height of the clouds, so with the clouds as a reference, the speed of Mach 2 is immediately highlighted.

To be honest, since he was a child, Yang Jing has really never felt such a fast speed, and it is estimated that more than 99.999% of people in this world have never felt such a speed.

A speed of 2,100 km/h doesn't sound like a very fast speed, which is really insignificant compared to the speed of spacecraft such as the Space Shuttle in space, which often exceeds 30,000 km/h at every turn, but there is no reference in space, even if you are a hundred times the speed of sound, you can't feel fast.

And now flying above the clouds at a speed of nearly 600 meters per second, that feeling is really incomparable, what supercar, what helicopter, in the face of this speed are all weak.

And now it is flying above the clouds, there is no shelter above, the strong sunlight shines directly through the atmosphere, and the reflection of the clouds below makes this place full of white flowers. But when you look up at the sky, you can find that the sky is bluer, the depth of the blue, and the purity of the blue.

At this time, after a minute of two Mach speeds, George began to slow down, even a heavy fighter could not continue to fly at such a high speed for a long time. As for the fighters in the American sci-fi blockbuster "Top Secret Flight" that can fly over a third of the Pacific Ocean at a speed of more than Mach 4, that kind of scenario can only appear in movies at present, and it is impossible to do it in reality.

"Boss, how do you feel, isn't it exciting?"

"Well, it's very exciting. It turns out that supersonic flight is like this! Yes, very good!" Yang Jing did not hide his feelings, and those who should be praised must be praised.

"BOSS, you felt the extreme speed just now, and now I want you to feel the extreme height. I'll continue to climb and take you around the stratosphere, which will be more than 50,000 feet. ”

"Fifty thousand feet, isn't that more than fifteen thousand meters?" Yang Jing was a little surprised.

"That's right, it's more than 15,000 meters in the sky, and that's the real stratosphere. Although we are now in a position that is almost in the stratosphere, this height is not enough. The higher you go, the more beautiful the view becomes. Boss, I promise you'll be shocked when you reach that height. ”

"OK, let's go up and have a look. ”

At this time, Yang Jing and George had already put on oxygen masks, and at this height, people would definitely not be able to stand it without wearing that thing.

Although the speed of the F15D has decreased, the altitude is constantly rising, and the numbers on the altimeter are constantly breaking through new heights. I have to admit that even if the F15D is an old model that has been in service for nearly 50 years, the performance of this aircraft is really not blown.

Continuing to climb upwards from an altitude of 12,000 meters, although the speed was not as fast as the climb below 10,000 meters, it also made Yang Jing a little frightened.

It didn't even take a minute, and the F15D steadily crossed the air at an altitude of 15,000 meters.

"Boss, the altitude is now over 50,000 feet, and this altitude has completely entered the stratosphere. Well, I don't know if you know if the B-2 'Phantom' stealth strategic bomber is not?"

"I know that the plane, which claims to be the most expensive aircraft in the world, and that it is stealthy, very awesome. ”

"Haha, that's right, the B-2 is really good, and that thing flies at this altitude or even higher when it is on a mission. ”

At this height, there were no clouds above me at all, all the clouds were underneath. The sky at this altitude is bluer, the visibility is also higher, and Yang Jing can even faintly see the moon when the sun is directly shining.

Flying at an altitude of more than 15,000 meters is no longer called "high-altitude flight", but "ultra-high-altitude flight". Most of the planes that can fly at this altitude are high-altitude reconnaissance planes or strategic bombers, and ordinary fighters rarely fly to such a high altitude.

Because at this altitude, the air pressure is already very low, and the air is thin, which will have a negative impact on the performance of the aircraft engine and the aerodynamic performance of the aircraft, so that the gravitational force and drag of the aircraft are reduced, the acceleration and deceleration performance is reduced, and the stability and maneuverability of the aircraft are deteriorated. As long as you are not careful, it will cause dangerous situations such as stall spiral, pitch swing, and in extreme cases, it will also cause air stops.

Therefore, fighter jets will not fly to such high altitudes unless it is necessary to test the performance of the aircraft, and fighter jets will usually move at altitudes below 7,000 meters.

It's the same as how a fighter doesn't fly at supersonic speeds under normal circumstances. Whether it is supersonic flight or ultra-high-altitude flight, the damage to the fighter itself is still quite large.

It's just that this time George pulled Yang Jing into the sky, and he had to let the boss feel the extreme speed and altitude, so George first flew at a speed of Mach 2, and then came to an altitude of more than 15,000 meters.

George's actions were really satisfied and appreciated by Yang Jing, Yang Jing just didn't want to praise it, whether it was the rapid flight just now or the current ultra-high-altitude flight, Yang Jing had never felt it before, even if he had a holy ring that was incomparably good, but the holy ring could take him to pretend to be at most, but it was absolutely impossible to take him to fly......

After feeling the altitude and speed, George began to control the descent of the fighter. In fact, less than 20 minutes have passed since takeoff, but it is these 20 minutes that at least 1,000 dollars of aviation fuel have been burned.

A fighter is an out-and-out oil tiger when flying at supersonic speeds!