Why is China interested in this engine?

Because it is the first high-thrust engine that can be accessed in China!

The turbojet-15 engine is a twin-rotor, annular combustion chamber, pneumatic nozzle, high-temperature turbine, and continuously adjustable turbojet engine with afterburner thrust. The maximum thrust is 81 kN, afterburner thrust is 122.5 kN. Thrust-to-weight ratio 6.5.

Just look at this afterburner thrust, when it reaches 120 kN, it is enough for all kinds of military aircraft to use, even if it is the current F-15, F-16 F100 engine, the thrust is also of this order of magnitude, and the domestic turbofan -10 in later generations is also of this order of magnitude of thrust.

Now, this turbojet engine of the technology of the sixties and seventies has reached this level!

At the same time, it is superior to the turbofan-6 engine in terms of unit thrust, thrust-to-weight ratio, medium and low altitude sub-transonic altitude, and speed characteristics of turbofan-6 and turbofan-6 that are now being developed in China.

Originally, the turbofan engine was characterized by low fuel consumption, but the turbofan-6 developed by the company was not very fuel-efficient.

"After carefully calculating the various technical indicators of the turbojet-15, we found that if it was used by our J-13, it would be allowed

The tactical and technical performance of the J-13 aircraft has been greatly improved. The low-altitude ascent rate is more than 300 m/s, the altitude is 5 km, the stable hoverload of Mach number 0.9 exceeds 6, the ceiling is 18 km, and the maximum Mach number used is 2.0. The take-off thrust-to-weight ratio of the aircraft exceeded 1.0 and reached 1.2. ”

The thrust-to-weight ratio is more than 1, which is a very important statistic, which shows that after takeoff, the fighter can climb vertically without difficulty!

Think about the Mirage 2000's climb at a high angle of attack after takeoff, and your own fighter will be able to do it in the future.

It is precisely because of this that the Third Aircraft Department has also continuously issued notices, believing that the J-13 aircraft switched to the turbojet-15 engine, which is superior to the turbofan-6 in some aspects, and that the turbofan-6 is inferior to the turbojet-15 in terms of practicality and certainty, so it is suggested that the program work should be transferred to the use of the turbojet-15.

Two months ago, the Third Aircraft Department held a demonstration meeting in Shenyang on the plan for the installation of J-13 aircraft with turbojet-15 engines, and passed the program review, which greatly exceeded the original target, close to the level of American F-16 aircraft, and the sea level rise rate reached 300 m/s!

Now, thinking of the excellent performance that the turbojet-15 can achieve by the fighter, everyone is excited, the biggest drag on the domestic fighter is the engine, if it is not the limitation of the engine, why do you need to engage in the slender and long J-8?

However, when he heard this data, Qin Feng frowned again: "The thrust-to-weight ratio reaches 1.2? That is, this fighter of ours has a take-off weight of only 10 tons? ”

If you count the fuel, even if there is only 3 tons of fuel, the weight of the body is only 7 tons, what can a 7-ton body do?

Even the F-16 fighter, which is mainly developed for close combat, has a body weight of 8.5 tons!

The take-off weight, that is the weight of full fuel and bombs, it should be the heaviest time, Qin Feng already felt that something was wrong, and changed to a big engine, but nothing else seems to have changed, it is still the chicken ribs that Mr. Gu introduced before!

"Yes, Qin Feng, you probably don't know very well, our plan was originally a plan for a front-line fighter, which does not need to have too much range, too much weight, and no complex avionics, and is mainly used as a daytime front-line fighter." Mr. Gu introduced to Qin Feng.

The entire J-13 plan focuses on this aspect.

On September 26, 1972, the Sixth Academy issued the development of the widening fighter as the No. 2 task, pointing out: "The No. 2 task is a front-line fighter, highlighting maneuverability, and the direction is correct, but it is necessary to vigorously reduce the total take-off weight, strive to achieve or exceed the thrust-to-weight ratio of 1.2, and strive to extend the endurance time compared with the J-6 under the premise of ensuring maneuverability."

This opinion also pointed out that the aircraft will replace the J-6 fighter and be used as the main aircraft of the next generation of front-line fighters to equip the troops. The development of the aircraft was called Mission No. 2, and was later named J-13.

It is different from the J-8, which is to intercept enemy bombers at high altitude and high speed, while the J-13 is to replace the J-6 and become a front-line fighter, so these indicators are reasonable.

"No, no, Mr. Gu, Director Fang, I don't think everyone has a clear understanding of future air battles." Qin Feng said: "I have discussed with Mr. Gu, although the current various combat examples show that light front-line fighters can defeat full-featured fighters, such as the MiG-21 can defeat the F-4 ghost by virtue of its small advantage, but the progress of electronic technology is changing with each passing day, if there is no perfect electronic equipment, the fighter will not be able to undertake future air combat missions, even if it is a fighter like F-16, it is also equipped with quite powerful electronic equipment." ”

What kind of fighters are needed in the sky of the future? Qin Feng and Song Lao have discussed this, and their opinions are basically the same, high-power fire control radar, advanced avionics, and various missile systems will definitely become the mainstream, and what the fighter needs is to turn its head as soon as possible and aim the nose at the target.

Qin Feng also told Mr. Gu, but Mr. Gu held Li Xiangyang's plan in the air, thinking that it was enough to use a machine gun, because the missiles were unreliable.

In the battle over Vietnam, the Sparrow missile was rather humiliating, but everyone must not have paid attention to the fact that throughout the Vietnam War, the Sparrow missile was also constantly maturing, and at the beginning, the hit rate was less than 5 percent, but by the end of the war, it had exceeded 10 percent!

What about later?

What many people don't know now is that by the Gulf War ten years later, the hit rate had already reached 75 percent.

Until now, it is still believed that future air battles will still be dominated by machine guns, which will make the air force lose valuable development opportunities, and on the wrong path, the greater the progress, the greater the losses.

Hearing Qin Feng's words, everyone frowned, this light fighter plan has been going on for ten years, and everyone's understanding of it has been ingrained, but at this time Qin Feng stood up and said, your thinking is wrong!

Many people's hearts are dissatisfied.

Although you are the hero of our J-8, what does it mean to slander our J-13 project so much now?

"There is also the Mirage 2000, I have also seen it with my own eyes, there is an advanced Doppler radar in the nose, and the West is making progress towards advanced avionics technology, we can't take a detour!" Qin Feng said.

"Smack." Suddenly, someone slapped the table, this person opened his eyes and glared at Qin Feng: "You little test pilot, you don't speak hard, why do you think that the West is right and ours is wrong?" Didn't the Vietnam War prove the West wrong? Our J-13 project is not only thought up in the office, we went to the navy and air force for more than a year of research, and the army agreed with our idea! ”