Wang Bin, general Qiu, chief engineer Lin and others soon came to the tower of the base. After all, it was a manned test flight. With the naked eye alone, the range they could see was very limited. Even with a telescope, the range they could see was very limited.


    However, according to the subjects of the test flight, the test flight not only needs to test various ordinary actions, but also needs to test the maximum speed and maximum height.


    After all, according to the original data of Qiye, that is, the data before replacing the engine.


    Its maximum speed can also reach Mach 2.0, and its maximum height can reach an altitude of 20000 meters.


    So what they want to test is whether the seventh master can meet higher requirements in terms of maximum speed and maximum height after installing a new engine.


    As for whether the seventh master can support the fuselage at such a high speed and height, whether general Qiu or chief engineer Lin of the base are not worried about this. After all, they know very well about the seventh master.


    What''s more, the seventh master, who is preparing for a test flight, is not an ordinary seventh master. Many of its key parts have been specially treated, so the strength of this seventh master''s body is definitely much stronger than that of an ordinary seventh master.


    "Take off!" as the command came from the tower, Zhao Feng immediately gently pushed the operating lever. Under the action of the engine, the aircraft began to slide slowly towards the front, and the speed began to accelerate gradually. With the acceleration of the speed and meeting the take-off requirements of the seventh master, Zhao Feng immediately pulled up the operating lever, and the seventh master left the ground at once, And almost at an angle of 45 degrees, he rushed into the air. Even at this upward takeoff angle, the seventh master not only didn''t slow down, but also accelerated.


    Obviously, after the new engine is installed, the power of the seventh master is stronger. If the old engine is replaced, when taking off, don''t say the angle of 45 degrees. Even if it is 30 degrees, the seventh master can''t basically do it, let alone increase the speed of the seventh master during the flight at this angle.


    Wang Bin and others on the ground are also very excited. After all, they took off successfully and took off at a large angle, which means that their engine is definitely a qualified engine.


    Professor poke and others also looked a little excited. After all, Professor poke made the greatest efforts in the R & D process of this engine.


    Although the drawings of this engine are provided by Wang Bin, Professor Zhang is responsible for the modification, manufacturing and commissioning of this engine. Only Professor Zhang knows how much effort and hardships he has made during this period.


    At this time, all the people in the air force base, including general Qiu, the pilots without tasks, and the ground crew, all looked at the seventh master in the air.


    Compared with Wang Bin, they are the people who know the seventh master best. Now the seventh master takes off at such a large angle, which makes them look forward to the engine on the seventh master even more.


    When the seven masters flew to a certain height, Wang Bin picked up a telescope to watch the seven masters in the air doing all kinds of actions.


    I saw the seven masters in the air sometimes turn with a large radius, sometimes turn with a small radius, sometimes dive, and sometimes snake maneuver in the air. It can be said that these movements made by the seven masters in the sky are no worse than those made by the national performance team, but because there is only one plane, the effect is not as spectacular as those performance teams.


    Soon, all the low altitude flight test action subjects were completed one by one. At this time, the aircraft reached the subject of low altitude high-speed flight test stage.


    "Report to the tower that the aircraft is in good condition and the engine is normal. Apply for low altitude and high-speed flight test." Zhao Feng''s voice came from the horn on the tower command console.


    "You can fly at low altitude and high speed!" after hearing Zhao Feng''s words, the commander of the tower looked at general Qiu and saw that he ordered you to fly at low altitude and high speed, so he ordered.


    With the command from the tower, I saw a stronger engine sound from the direction of the seventh master in the air, and the seventh master also changed his flying attitude into a level flying attitude flying eastward. At the same time, the speed of the aircraft was also increasing rapidly.


    Before long, Zhao Feng''s voice came again from the horn of the tower: "report to the tower that the aircraft has broken through the sound barrier. At present, the speed of the aircraft is Mach 1.2 and the aircraft is still accelerating."


    "Mach 1.23!"


    "Mach 1.28!"


    "Mach 1.45!"


    “......！”


    "The plane has reached Mach 1.7, in good condition, and the engine power is very abundant." soon, the plane reached Mach 1.7! You know, this is the speed at low altitude!


    However, after the seventh master reached this speed, the tower ordered Zhao Feng to raise the flight altitude and conduct a test flight at the maximum altitude and maximum speed. Now the aircraft has reached Mach 1.7 at low altitude. Such a speed is very dangerous at low altitude. If you are careless, it is very likely to destroy the aircraft and kill people. For the sake of safety, That''s all for the low altitude test.


    Compared with test data and aircraft, as an excellent pilot in China, Zhao Feng''s life is more important. As for the test of low altitude maximum speed, Wang Bin and they can put it on other aircraft, such as UAV.


    Within a few minutes, Zhao Feng reported to the tower. At this time, he had reached an altitude of 15000 meters, and the altitude continued to rise. At the same time, the speed of the aircraft was slightly higher than that before, reaching Mach 1.8.


    "Continue to raise your altitude to the limit that the aircraft can raise, and continue to raise the speed in terms of flight speed." the tower continued to command immediately.


    "Understand!" Zhao Feng''s answer came from the horn.


    At the same time, the radar on this side of the tower also shows the height and speed of the seventh master driven by Zhao Feng at this time.


    Sixteen kilometers, seventeen kilometers... Twenty thousand meters. Soon, the altitude of the plane has exceeded the highest altitude that Qiye could reach. At this time, Qiye''s rising speed is still very fast and does not slow down because the altitude has exceeded the original limit.


    At the same time, with the increase of altitude, the air becomes thinner, the resistance becomes smaller and faster, and soon exceeds Mach 2, that is, the original limit of the seventh master, and is still increasing rapidly.


    After all, the maximum thrust of Qiye''s original engine is less than five tons. Even if the afterburner is turned on, the maximum thrust is less than six tons.


    And the engine installed by the seventh master! Its maximum thrust without afterburner has reached 15 tons! But the seventh master had three times the thrust of the original engine!


    This is still the case without afterburner. If afterburner is applied, it will definitely exceed 16 tons. Therefore, after breaking through the original speed and height limit, the seventh master can continue to improve the height and speed.