Why can’t the J-8II cruise at supersonic speed?

Military common sense needs to be strengthened.

I remember an article said that the J-8 II is currently the fighter with the smallest resistance to supersonic flight. According to this theoretical reasoning, the J-8 II only needs to be equipped with an engine with average performance to achieve supersonic cruise. Why has it never been Have you ever heard that the J-8 II can cruise at supersonic speeds? Haven't done any research on this?

Even if your premise is correct, the subsequent conclusion is wrong. Fighters of different eras have different technical levels. Can the same indicators be directly compared? For example, the wings of World War II fighters were much smaller than those of today's fighters. Could it be that their maneuverability was better than that of today's third- and fourth-generation aircraft? Comparison only makes sense if the technical level is the same.

Question supplement: Air Force experts said when talking about the J-8 II: The J-8 II’s ultimate speed is more than M2.2. The reason why it dare not fly beyond this speed is because of the strength and endurance of the aircraft body. The thermal performance is not allowed. High-speed flight will cause the temperature of the aluminum alloy skin on the surface of the aircraft body to increase and its strength to decrease. The aircraft may disintegrate in the air.

These are all nonsense. The maximum speed of many fighter planes is artificially limited. Your so-called maximum speed is meaningless, not to mention that the maximum speed in modern air combat has long been of no value. .

From these words, we can see two problems. 1. The engine power of the J-8 II is sufficient (here we don’t care whether it turns on afterburner when flying at supersonic speed)

What is enough? We are still using crappy turbojet engines, what thrust is enough? All current fighter jets fly at supersonic speeds with afterburner turned on, except for the F22A.

2. What restricts the J-8II’s long-term high-speed flight is not the flight resistance but the body strength. From this we can deduce that if the J-8 II's body strength and heat resistance are sufficient, it can fly at higher speeds and even cruise at supersonic speeds.

Just a fantasy. Even according to your logic, after the strength is increased, the increase in the weight of the aircraft itself is enough to increase the inefficiency of the speed. It is impossible to build a third-generation supersonic cruise aircraft, let alone a shabby second-generation aircraft like the J8. Instead of wasting energy on such a thing, it is better to concentrate on the fourth generation.

This leads to thinking: The Soviet MiG-25 uses stainless steel as the high-temperature resistant surface material, allowing the aircraft to reach the high speed of M2.5. Why can’t the J-8II follow the example of the MiG-25 and use stainless steel as the surface material? What about the surface materials that enable the flight speed to exceed M2.2?

MIG25 is a typical piece of garbage. To reach the speed of 2.5, it requires a long period of slow acceleration, which has no practical significance. And this is mainly due to the fact that the engine can turn on afterburner for a long time, even though it flies like this once. The rear engine will be scrapped.

If the "heat" barrier can be broken through, then if the J-8 II is equipped with an engine with large thrust and high speed flight efficiency, wouldn't the J-8 II be able to achieve supersonic cruise? Although the cruising speed may not reach M2.5, even if it only reaches M1.5-1.7, it is a big breakthrough.

No fighter plane can break through the thermal barrier. This is a physical law that must be followed. It is impossible for any fighter plane to fly at high speed for a long time. Especially when the speed exceeds Mach 2, the thermal barrier effect is very obvious, even if it is The specially designed Blackbird is no exception. In addition, the currently known maximum supersonic cruise speed is Mach 1.8 of the YF23, and 2.5 is impossible.

PS: MiG-31 can cruise at supersonic speed

What a joke, the maximum speed is the speed of supersonic cruise? I don’t even understand the basic concept. MIG31, like MIG25, does not have supersonic cruise capability and can only reach higher speeds by turning on afterburner for a long time.