"Good, good, correct attitude, putt, slow down!" With this success, the next high-speed sliding run will be very smooth, every time the sliding run, will accumulate an experimental data, with the high-speed sliding running, the first flight day, is also approaching day by day.

On this day, just after returning from the gliding experiment, Qin Feng took off his helmet, changed into his flight suit, and went to participate in the routine discussion.

As a test pilot, not only to test the flight, but also to discuss the results of the test flight with the technicians after the test flight is completed, if the flight is not in place, then to continue to fly a few sorties.

"This time the speed flew to 15, which is already very good, and our high-speed run, the data has been collected enough." Zhou Lao said: "After these experiments are completed, the next thing is what we are looking forward to the most." ”

What to expect? Of course, it was the first flight, and after so many times of sliding on the ground, now, I finally decided to release this fighter for the first time, how can I not look forward to it?

Zhou Lao looked at everyone present, his eyes slid over everyone's body, and then, finally, fell on Song Lao's body.

"Lao Song, for the sake of the smooth operation of our first flight, I suggest that we add counterweights to the plane to make our plane a statically stable aircraft." Zhou Lao said.

When Zhou Lao proposed this, Qin Feng was immediately stunned, what, add counterweights?

In the research and development of domestic fighters, adding counterweight is a means often used, the most obvious of which is the J-7M, this aircraft is equipped with Marconi avionics, the nose is lighter, but because there is no other means, there is no technology to understand the aircraft, so it can only be added to the weight of more than 100 kilograms in the nose, so that the aircraft can be restored to its original state.

Although the composite tail was also used to reduce weight, etc., but in the end it was not used, or to add a cement counterweight is the most real, until the J-7E, it can be regarded as a complete understanding of the aircraft's technology, remove the counterweight.

This is also because the MiG-21 was not developed by its own side, and it did not understand the past, but what about the J-10? J-10 is different, J-10 fighter is the most advanced fighter in our country, it is designed by itself, this kind of counterweight, why add it?

"From the perspective of the risk of the first flight, adding counterweight is the safest." As the chief pilot test pilot, Zhou Lao's starting point is to ensure safety!

The first flight has been postponed twice, and the pressure on everyone is increasing.

Different from space flight, the first flight of the drill bucket machine does not have the restriction of the "launch window", as long as the meteorological conditions allow, the first flight can be made at any time, the main problem is the state of the aircraft, the J-10 fighter is constantly testing, constantly verifying the state of the aircraft, for a brand new fighter that has never been in the sky, the "state" of the aircraft is the key to the success or failure of the first flight.

In the first flight state of the aircraft, static stability or static instability is an important indicator.

Static stability, that is, the aircraft is not controlled, is stable, static instability, that is, unstable, extremely difficult to control, specifically, is the position relationship between the center of lift and the center of gravity, the center of lift and the center of gravity coincide, or in the back, it is stable, in the front, it is unstable.

In detail, the center of gravity of a statically stabilized aircraft is like the fulcrum of a swing, with the nose being one end and the lift acting point at the other. When the airflow lifts the aircraft up, the elevation angle increases, the lift increases, and this end of the lift force goes up, causing the aircraft to bow its head. That is, the plane always tends to be level.

Static instability is different, a slight change in airflow, will have a great impact on the aircraft, the airflow to make it look up, its own lift continues to let it look up, in a short time, the aircraft was pried over, so, manual control is simply too late, the traditional mechanical control is not able to surrender the static unstable aircraft, only fly-by-wire control can, to monitor the condition of the aircraft at all times, fine-tune the rudder surface.

There is no such technical reserve in China, and when J-8 was engaged in ACT technology, it suffered a big loss, so what about Chengdu?

The first flight of the J-10, if there is a problem, the pressure is considerable, and even the entire project may be aborted!

Of course, this is still the pressure of the Su-27, even if the J-10 is about to make its first flight, there are still many people who are asking to buy the Su-27, thinking that the J-10 should invest the funds in the purchase of the Su-27.

Under this tremendous pressure, Zhou Lao believes that it is best to ensure reliability.

"After all, we are testing a canard aircraft for the first time, and it is also the first time to test a full-digital fly-by-wire aircraft, so we have to be safe, first counterweight to static stability, and then remove the counterweight little by little, and relax it little by little, which has great benefits for the safety of the whole experiment." Zhou Lao said.

"However, this will greatly delay the test flight plan, and it is even more of a deception!" Qin Feng opened his mouth, he had his own thoughts, so he had to say it, when he encountered a problem, he would not hesitate to quarrel so red-faced, and now, when Qin Feng heard Zhou Lao's words, he immediately opened his mouth to object.

"Our aircraft, when designed, is designed according to static instability, if the first flight with counterweight becomes static stability, what is the use? Is that still called the first flight of the J-10? Qin Feng said: "Let's remove the counterweight in the future, isn't this a long detour?" The entire test flight process will even be delayed for a year or two, and the previous test flight data will not be of any use to the future at all! ”

From this point of view, adding counterweight is deception, many of these subsequent test flights are unnecessary, the counterweight is reduced to zero, and you have to start again, at that time, it can be regarded as the first flight, which will be delayed for at least a year or two!

All the control problems of the aircraft have not been solved, and it still needs to be done from scratch, so what is the point of such a false first flight?

In fact, adding counterweights is also an international practice, but Qin Feng resolutely opposes it, foreign third-generation aircraft have been flying out for 20 years, and they are 20 years behind the world's advanced level. You have to race against time to catch up!

"Moreover, many leaders have high hopes for our aircraft, once stimulated by the false information of the first flight, then they may expect the aircraft to complete the test flight as soon as possible and equip the troops, so that more test flights will be carried out without being fully prepared and completing the work, and in the event of an accident, what it means for the J-10 project, everyone knows in their hearts." Qin Feng looked at the people present, his eyes swept over everyone, and finally fell on Song Lao's face: "Song Lao, I personally resolutely oppose adding counterweights, as the chief test pilot, if I am allowed to fly for the first time, I must fly a quiet and unstable plane!" I have confidence in our aircraft! ”

The words of confidence stimulated everyone, especially Yang Gong, as the person in charge of the telex system, cast a grateful gaze, I dare to build, you dare to fly, let's send J-10 to the blue sky!

"Old Song, it's not good, the hangar reported that the plane leaked a few drops of oil!" Just then, a phone call came.