J-20 5th Gen Fighter Thread IV (Closed to posting)

[Blitzo]

Damn, that new paint scheme is sexy.

 

[by78]

Well, I was skeptical, but it looks like they clipped the corners of the canards too.

Yes, they definitely have.

 

[delft]

Yes, they definitely have.

I suppose the figure tells us WHY, but I am handicapped, I can't read it.

 

[Insignius]

Yes, they definitely have.

Wow. Interesting chart. Too bad that stupid watermark is hiding the description of the X-axis. But I guess it shows the GHz Band, and it shows that the RCS of that clipped canard at 10-20 GHz, which would be around X-Band and Ka-band, is dramatically reduced to -30-35 dBm² , which is a very great value (the F-22 is quoted to have overall around -29 to -30 dBm²).

 

[by78]

 

[Insignius]

Though, this also shows that the unclipped canards had quite a bad RCS, with only -15 dBm². I guess this would have affected the overall stealth of the J-20 quite severely. Good that they have addressed that.

 

[kwaigonegin]

Wow. Interesting chart. Too bad that stupid watermark is hiding the description of the X-axis. But I guess it shows the GHz Band, and it shows that the RCS of that clipped canard at 10-20 GHz, which would be around X-Band and Ka-band, is dramatically reduced to -30-35 dBm² , which is a very great value (the F-22 is quoted to have overall around -29 to -30 dBm²).

The watermark didn;t hide anything... The Horizontal denotes the wavelength values

 

[Insignius]

Yeah, guessed so. It seems that the new J-20 is truly overall improved.

I doubt that this huge difference in dbm² value is only due to the clipped corner. I think this must represent the overall VLO gain of the plane itself.

There is a huge difference between something around -20 and -30. It cant be just because of that minor modification on that canard.

 

[latenlazy]

Yeah, guessed so. It seems that the new J-20 is truly overall improved.

I doubt that this huge difference in dbm² value is only due to the clipped corner. I think this must represent the overall VLO gain of the plane itself.

There is a huge difference between something around -20 and -30. It cant be just because of that minor modification on that canard.

Are we sure it's wavelength and not an angular measurement? The graph labels that axis as degrees.

And I'm pretty sure the measure is only for the canard itself. The description only mentions wing corner, and It's not unusual for small changes in geometry to generate large differences in RCS.

Plus one needs to remember that even a -16 dbsm return would be representative of the real thing, just the rcs performance of the geometry. The real thing would still have RAM, especially on the edges.

 

[shen]

The redesign of the weapon bay door serration from 200X to 2011 remind me of the kind of change from "first generation stealth" F-117 to F-22.

Whatever the benefit of large sawtooth vs smaller sawtooth edge, Chinese engineers must have been aware of the principle before 2001 was built. Is it because new RAM material has been developed to absorb certain wavelength, so larger shapes can be used to deflect other wavelength?