Chinese media: Managed to significantly reduce the RCS of the J-20A fighter in the bow projection

The Chinese media, referring to the country's aircraft designers, write that for the updated version of the fifth generation fighters it was possible to significantly reduce the visibility. We are talking about the latest version of the 5th generation fighter of the PLA Air Force - the J-20A.

The reports say that the designers managed to reduce the RCS (effective scattering area) in the nasal projection by about 20%. The minimum parameters, according to the published reports, for the RCS in the mentioned nasal projection have been reduced from 0,01 to 0,008 sq. M. This parameter is indicated for frequencies up to 10 GHz.

For comparison: the declared EPR in the bow projection of the American F-35 fighter at comparable frequencies is estimated at 0,005 sq. M.

If you believe the Chinese reports, the J-20A's EPR is already quite comparable to that of its direct American competitor (“analogue”) - the new generation F-35 fighter.

How relevant is the comparison of EPR indicators at marks below 0,01 mXNUMX for such funds aviation - a separate question.

How did the PRC manage to reduce the effective scattering area of ​​a combat aircraft?

Chinese sources of information do not yet give an exact answer to this question. It is known that Chinese aircraft designers continue to experiment with the coating applied to the surface of the fuselage and cockpit canopy, as well as with the geometry of the combat aircraft. In particular, a coating based on a combination of rare earth metal oxides is used, which shows a significant increase in the ability to absorb electromagnetic radiation in a wide frequency range.

At the same time, there is still no evidence that the problem with Chinese-made engines was solved for the J-20. Earlier it was reported that the J-20 fighter could take off on WS-15 engines with "design changes" by early November 2021. There is not much time left until the beginning of November.

Comments

[Sayeret Matkal]

I'm waiting for the Chinese troops to make claims to the extinct Far East.
What are we going to do then, comrades?
Do you think the Chinese are our friends? Funny. They will strangle us economically (already), destroy and take out our natural resources and forests. And what are we going to do.

[Volodin]

Quote: sayeret Matkal

I'm waiting for the Chinese troops to make claims to the extinct Far East.
What are we going to do then, comrades?

Fierce offtopchik. Tsyganochka with an exit, or a unique way to comment on the material about the EPR of a fighter in the forests of the Far East. It’s just interesting how it comes out with individual readers, and in general where it is written that "the Chinese are our friends" ...

[Sayeret Matkal]

In fact, you can not answer anything

[venik]

Quote: sayeret Matkal

In fact, you can not answer anything

=======
Why are you "poking" started? Or is there no concept of "you" in your native language?

[Vladimir_2U]

Quote: sayeret Matkal

Do you think the Chinese are our friends?

Do you sign up for OUR with such a nickname? So funny ........ NOT VERY!

[Sayeret Matkal]

It is clear, in fact, you cannot answer either

[rocket757]

Yes, yes, what is the point? What to answer?

[venik]

Quote: sayeret Matkal

It is clear, in fact, you cannot answer either

========
Okay, I’m going "to the point": A clown - he remains a clown in the "Promised Land" too!

[Vladimir_2U]

Quote: sayeret Matkal

It is clear, in fact, you cannot answer either laughing laughing laughing laughing

What is the essence of a funny gurgle?

[Victor_B]

Here I have a question.
On the bow is a RADIO CLEAR radar hood.
Behind him is just a solid frame. It has a canvas AFAR.
Well, this is all more than square meters. meters.
This is how it all can give 0,00000000000001 sq. m. EPR?

[Vladimir_2U]

Quote: Victor_B

On the bow is a RADIO CLEAR radar hood.

Well, the frame can be tilted and covered with a radio absorber, and the AFAR elements are less than the wavelength, but in general YES, a very interesting question!

[dauria]

but overall YES, a very interesting question!

The answer is simple . EPR is in no way related to the geometrical size. A polished sheet of gold in 1 sq. m, it can be a hectare, and 0, 0000 sq mm. And the antenna (any, not just AFAR) is the easiest to make a "black hole" - it is exactly what was made. The minimum SWR in both directions, everything that falls on it must be converted into current in the load, and not reflected back. A matched active load will be sufficient.
Moreover, the Chinese already know arithmetic and have even heard about Maxwell's equations and Volpert's nomograms. Believe it or not, they raised a generation of scientists and engineers.

[Bad_gr]

Quote: Victor_B

This is how it all can give 0,00000000000001 sq. m. EPR?

As an option to reduce the RCS, you can take the method used on the F-35 (F-22), their locator is not perpendicular, but with a large upward angle, therefore, it reflects the radiation upward (or slightly from below) upward.

[venik]

Quote: Bad_gr

As an option to reduce the RCS, you can take the method used on the F-35 (F-22), their locator is not perpendicular, but with a large upward angle, therefore, it reflects the radiation upward (or slightly from below) upward.

======
Well, at WHAT ("large") angle in the photo is the radar grille ???

[Bad_gr]

Quote: venik

Well, at WHAT ("large") angle in the photo is the radar grille ???

This locator, in addition to the space in front of the aircraft, must also scan the ground. From this point of view, and look where it is directed.

[Bad_gr]

Quote: Bad_gr

This locator, in addition to the space in front of the aircraft, must also scan the ground.

MiG-35

[venik]

Quote: Victor_B

Here I have a question.
On the bow is a RADIO CLEAR radar hood.
Behind him is just a solid frame. It has a canvas AFAR.
Well, this is all more than square meters. meters.
This is how it all can give 0,00000000000001 sq. m. EPR?

=========
Yes, there is here, on the VO, one figure who, in a "clear eye", "splashing with saliva" assures that the EPR of the F-22 in the frontal projection is 0,0001 sq.m.!

[yfast]

therefore, it also reflects radiation upward (or slightly from below).

And this bracket, to which the AFAR is attached, is invisible? If we make a radar, for example, ~ 100GHz, then it will see irregularities of the order of ~ 3mm, including the AFAR of the aircraft, and all these invisibility games will come to naught. And if it's dual band, it's even better.

[Nest]

All problems with invisibility are solved by using radars directly from low-flying satellites, which observe all these "invisibles" almost at right angles, and the reflective surfaces of the aircraft try to reflect the radiation of the ground-based radar upward, which further increases the satellite's capabilities. Alternatively, it may not emit at all, but try to receive the reflected signal from ground-based radars. And now the question: is it only for the Internet that you need a Starlink network from the respected Elon Musk? And we spend money on cinema in space ...

[Bad_gr]

Quote: yfast

And this bracket, to which the AFAR is attached, is invisible?

Perhaps it is covered with radio absorbing panels (there is a place for them). But it is impossible to close the locator, therefore, only the re-reflection of the radiation to the side (up), so that it does not return to the enemy's locator.

[Dzafdet]

Trim the sturgeon, trim it! EPR F-22 = 0,2 sq. m, F-35 = 0,2-0,3 sq. m SU-57 = 0,3 sq. m. Everything else is from the evil one. There are a bunch of systems that detect both the F-22 and the F-35. We are developing radiophotonics and doing the right thing!

[Tuzik]

"The reports say that the designers were able to reduce the RCS (effective scattering area) in the nasal projection by about 20%."
Probably the front wings were cut

[sportline]

It is more correct to speak in frontal projection. Probably so.

[svp67]

The EPR of the J-20A is already quite comparable to that of its direct American competitor ("analogue") - the new generation F-35 fighter.

Analog F-35 ?????? No, the F-22 is yes, but for the F-35, the Chinese J-31s are "finished", they cannot "finish"