Why is stealth poor? What is stealth?

The Su-27 was designed earlier, and stealth was not considered at that time. Outwardly, the Su-27 has a tall twin tail, straight and short intake ducts, no shielding at the engine inlet, and protruding pelvic fins, all of which can lead to a strong radar reflection source.

In order to achieve the goal of not being discovered by the opponent, the aircraft generally uses means such as absorbing electromagnetic waves and changing the reflection angle to reduce the probability of detection by the opponent's radar, and this kind of aircraft is generally called a stealth aircraft. Ways to discover stealth aircraft:

1) LiDAR is an optical detector composed of TV and infrared, and the tail of the stealth aircraft is sprayed by the engine as high as several hot airstreams, which is its detection source.

2) The electromagnetic wave of meter-wave radar has the characteristics of low absorption loss and low reflection loss. These features are used to break the stealth, but the meter-wave radar also has the characteristics of large antenna size and poor anti-interference, so the meter-wave radar cooperates with other high-frequency radars to guide the missile with the end of the active guidance head.

The fool held the "stealth grass", Ma Laojing went to the market, reached out and grabbed someone else's money, and walked away. The money owner grabbed him and beat him violently. The stupid servant Pi Shenzi shouted:

No matter how you fight, you can't see me anyway! Because I have stealth grass! ”

In addition to laughing, I can't help but think that the ability to be invisible is also the dream of many people.

The development of modern materials technology has already made dreams come true to some extent. Of course, people can't do it yet, like in myth or science fiction, the whole person completely disappears, and becomes a transparent person in the air.

I'm tired of it, I want to be calm, or I just don't want to be found out what I really think.

Stealth technology has received unprecedented attention in the past decade, and almost all modern military aircraft have to be linked to stealth, and even the tattered piece of LCA put together by Ah San has to claim to have stealth capabilities. What is stealth, in fact, the correct name should be low radar reflective surface (reduce infrared signature separately), radar cross section, commonly known as RCS, to stealth to find a way to reduce RCS so that the radar wave is reflected in other directions, not to the direction of the receiver. In fact, not long after the invention of radar, many researchers have noticed that objects of different shapes have very different reflection characteristics on radar, specific to the shape of the aircraft has the following phenomena: in different fuselage cross-sectional shapes, the helmet-shaped RCS is the lowest, that is, like two U letters buckled together, or like two steel helmets buckled together, if you carefully observe the following SR71 fuselage shape; The leading edge of the wing only has a large amount of reflection at a certain angle, and if it deviates from this angle, the amount of reflection drops sharply, and the same is true for the horizontal tail, if you look closely at the shape of the following F22 or YF23, you will find that all the places where the shape has a sweep angle, the sweep angle is all the same; The reflection of the vertical tail is large, but if the image is tilted inside or outside, the reflection is greatly reduced; The air intake tract is the main source of reflection, especially the outermost fan or compressor blades of the engine; Exposed cockpits, aircraft plug-ins, etc.; These results led directly to the shape of the SR71, which can be said to be the earliest...

It's when you enter the other person's space through social tools without leaving a trace.