Chen Ming didn't understand for a moment and subconsciously answered, "X frame."
"I'm afraid there won't be enough," Li Zhan said.
Now the technical staff of the R&D team were sweating, and it was their turn to have complicated expressions and start to worry. Oh my God, this is a fourth-generation aircraft. Do you know how much it costs to build a prototype? Even the richest people in the United States are just that.
Thirteen prototypes were built, of which the first two were demonstration aircraft in the research and development stage, and the last eleven were test aircraft in the engineering stage. The last four even entered the delivery stage and directly entered service with the U.S. Air Force.
Our model is similar, just follow the US military to cross the river. So the changes between the first few prototypes and the later ones are quite big. It can even be said that each one is different, from rough to delicate, and gradually to perfection. Li Zhan is now opening
It is the earliest prototype aircraft except the prototype aircraft used for static testing. Many test flight projects with a relatively high risk factor are carried out by this black ribbon aircraft.
However, Li Zhan's question really made the R&D team nervous. What are you going to do?
In the blink of an eye, the No. 01 black ribbon reached 1XXXX meters. Everyone's hearts were raised in their throats, and they had no time to think about how many planes Li Zhan was going to crash.
Li Zhan still reported every 100 meters, with a clear and steady voice. No one was surprised by the strong psychological quality of test pilots. They all often dealt with test pilots and were used to it. Without a strong heart,
Not a test pilot.
The enemy of a combat pilot is the enemy, and the enemy of a test pilot is his own fighter plane.
"We are about to break through the prefix 2." A technician wearing thick glasses said to himself. His voice was very soft, but suddenly he found that his voice was heard all over the tower, and he scared himself.
A jump.
It was really quiet in the tower, and everyone held their breath carefully.
Li Zhan was also highly concentrated, focusing most of his attention on altitude and climb rate. The latter was very important. If the climb rate dropped to a certain level, the aircraft was in danger of stalling and spinning. But Chen Ming and others were surprised to find that
Li Zhan seemed to intend to make the aircraft develop in the direction of stall and tail spin.
Is it intentional?
Chen Ming did not dare to communicate with Li Zhan rashly at this time, lest he be distracted. The No. 01 Black Ribbon has passed the maximum design limit. Every subsequent progress is of great significance, and the corresponding performance data of the aircraft is crucial. It is true that
Nowadays, relatively low requirements are put forward for the ceiling of fighter jets. The high altitude and high speed required in the past have been proved by actual combat to be unsuitable for modern warfare.
But looking at it from another perspective, if the fighter can have a higher ceiling and faster speed through non-targeted design, why not do it?
Li Zhan suddenly said, "The ceiling envelope came out soon! The aircraft control system is normal, the power attenuation is serious, and the other systems are normal!"
Following his report, Black Ribbon No. 01 pushed upward for more than 200 meters with his last breath, breaking through the 20,000-meter limit in one fell swoop, and finally reached 2XXXX meters.
Everyone on the tower was seriously glowing and clenched their fists and punched hard. At this moment, the No. 01 Black Ribbon finally ran out of climbing momentum, and then started to go straight down like a stone that had reached the critical point of a parabola.
Lose.
"It's stalled!" a technician exclaimed.
Chen Ming quickly asked Li Zhan, "Dongyao, report the situation!"
"Tower, I took advantage of the situation to recover from the stall and tail spin. All systems of the aircraft are normal. It's over!" Li Zhan said steadily.
Everyone looked at each other in shock. The adaptive flight plan had long since become out of shape. Moreover, they had never seen a test pilot leading a test flight plan and the tower that was supposed to give orders became a follower. They didn't know Li Zhan well and had no idea.
Li Zhan has brilliant achievements in the past, especially in extreme flight and dangerous situations.
The No. 01 black ribbon swirled downwards and dropped very quickly. It started falling vertically from an altitude of more than 20,000 meters, just like the return capsule of a manned spacecraft.
Li Zhan in the cockpit rotated with the aircraft at high speed, sometimes turning laterally and sometimes rolling. The tail spin was more serious than expected. It may be related to the altitude of entering the tail spin, or it may be related to the previous flight attitude. It was caused by stalling.
The tail spin is certain, and Li Zhan was pleasantly surprised at this point - the critical point of black ribbon stall is very low.
That said, Black Ribbon's minimum speed envelope data is very good.
For example, if a certain fighter aircraft stalls at an airspeed of 220 kilometers per hour, then the black ribbon can achieve a stall envelope of 180 kilometers per hour. Of course, this is just an analogy. What Li Zhan can be sure of is that the black ribbon has a minimum speed of 180 kilometers per hour.
The speed performance is better than that of the Rafale fighter.
And he knew very well that the Rafale fighter jet could achieve a minimum airspeed of 195 kilometers per hour. At that time, he had used this airspeed to land on the Dai ship.
Generally speaking, the maximum airspeed and the minimum airspeed cannot have both. If you want the aircraft to have a greater airspeed, it is difficult to ensure a smaller minimum airspeed at the same time. Therefore, some high-altitude and high-speed fighters usually have relatively small wing sweep angles.
(The angle between the trailing edge of the wing and the fuselage), this aerodynamic layout design is very suitable for high altitudes and high speeds.
For example, the J-8 has two wings retracted back like Superman, giving it a sense of speed, while the layout of the J-11 is quite satisfactory. The aerodynamic layout of the J-11 series derived from the Su-27 is probably a conventional aerodynamic layout design.
’s pinnacle work.
Minimum airspeed is an important indicator of low-altitude and low-speed combat performance, which is very important. It also means that the aircraft has a smaller turning radius and the nose has better pointing agility.
During the high-speed rotation, many systems of the aircraft were alarming, which was an abnormal attitude. Black Ribbon has a very advanced warning system, and the flight control system has been trying to restore the aircraft's attitude to normal. Li Zhan decisively switched to pure manual control and turned the aircraft over.
The control right is completely in your hands, otherwise it will conflict with the automatic control system of the flight control system.
What surprised Chen Ming and others was that Li Zhan didn't seem to be in a hurry to recover, but let the plane fall downwards according to the attitude. He quickly understood Li Zhan's intention and let the plane fall when the altitude was sufficient.
Staying in the tail spin for as much time as possible can expose more problems and monitor more relevant data.
The height of the clouds was about three thousand meters. Everyone's hearts dropped in their throats as they watched the height of the No. 01 black ribbon drop rapidly. As time went by, more and more people's eyes were about to pop out, subconsciously.
He was clenching his fists and feeling highly nervous.
"Dongyao, hurry up and get out!" Chen Ming couldn't withstand the pressure. Seeing that the altitude was over 4,000, he quickly gave Li Zhan instructions.
Li Zhan said, "Go under the clouds and then pull out. Pay attention to the attitude of the aircraft."
"Okay." Chen Ming could only agree.
Black Ribbon No. 01 flew very high, but did not go very far. The position was probably above the field, more specifically above the runway. Li Zhan did not change the position because there were residential areas around it.
, if a crash occurs and you are unable to control the aircraft, you may threaten people's lives and property.
If it is at a high altitude directly above the runway, even if it falls, there is a high probability that it will fall on the outside field of the field, and the loss will be minimal.