J-20... The New Generation Fighter III
- Thread starter siegecrossbow
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So, i'm just going through the kopp and other RCS figures.
This is a PAK-FA RCS projection from
It claims that the PAK-FA will likely be -40 dBsm, if the intake blocker is correctly installed and RAM cancels 16 dBsm.
If you compare it with the Kopp figures; if you just eye-ball it without using computer-aids, it looks as though the dBsm is 19 at 1.2 ghz (L band) is about -19. On 8ghz, it's -26, and on 12 ghz, it's -33.
This translates to 0.0126, .0025, and .0005 m^2 RCS.
Using Kopp's figure for the projected RAM, we get -22.5, -33, and -36 for 1.2 ghz, 8 ghz, and 12 ghz.
That's 0.0056, 0.0005, and 0.00025 m^2. Not as good as the F-22's RCS, but close under ideal conditions. Another thing to note is that the PAK-FA, versus the J-20, has a significantly reduced cone of RCS reduction; the J-20 tends towards a 30 degree cone of reduced RCS, while the PAK-FA only hits about 22.5 degrees before its RCS reduction starts to lag.
Another interesting thing to notice is that in the indicated projection, the J-20 has a huge frontal RCS spike right on the nose. Perhaps this is to be canceled by interference patterns? No idea.
Of course, remember both these projections are flawed. They don't consider things like traveling waves or other more difficult to simulate electromagnetic phenomenon.
This is a PAK-FA RCS projection from
It claims that the PAK-FA will likely be -40 dBsm, if the intake blocker is correctly installed and RAM cancels 16 dBsm.
If you compare it with the Kopp figures; if you just eye-ball it without using computer-aids, it looks as though the dBsm is 19 at 1.2 ghz (L band) is about -19. On 8ghz, it's -26, and on 12 ghz, it's -33.
This translates to 0.0126, .0025, and .0005 m^2 RCS.
Using Kopp's figure for the projected RAM, we get -22.5, -33, and -36 for 1.2 ghz, 8 ghz, and 12 ghz.
That's 0.0056, 0.0005, and 0.00025 m^2. Not as good as the F-22's RCS, but close under ideal conditions. Another thing to note is that the PAK-FA, versus the J-20, has a significantly reduced cone of RCS reduction; the J-20 tends towards a 30 degree cone of reduced RCS, while the PAK-FA only hits about 22.5 degrees before its RCS reduction starts to lag.
Another interesting thing to notice is that in the indicated projection, the J-20 has a huge frontal RCS spike right on the nose. Perhaps this is to be canceled by interference patterns? No idea.
Of course, remember both these projections are flawed. They don't consider things like traveling waves or other more difficult to simulate electromagnetic phenomenon.
Maybe it is due to the testing pitot tube?
I've noticed that, me thinks we're on Lockdown, they may be doing a little trouble shooting, its prolly about time. Who knows we may end up the OVT nozzles or something else cool, I take it 2002 hasn't flown, or it has and we have been shut down?
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AssassinsMace
Lieutenant General
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I dont remember kungfu panda having that character.
Have you met or talked to JB's legions of rabid teen girl fans? They would kill their mum for a sniff of his underwear. I kid u not.
I dont remember kungfu panda having that character.
Have you met or talked to JB's legions of rabid teen girl fans? They would kill their mum for a sniff of his underwear. I kid u not.
The pitot tube doesn't exist on the J-20 in Kopp's simulation. There's something screwy with the J-20 if it has a 1 m^2 RCS on a direct heading; because that either means the J-20 is horribly designed or there's effects we don't know about determining its frontal RCS.
It's also possible there's a plasma-stealth system being used on the J-20's radome. A key problem with stealth radomes is that the AESA electronics are inherently unstealthy, and for the radar to work, the AESA would have to be exposed. Using RAM on the radome results in a reduction in AESA sensitivity because the returning radar signal gets absorbed by the RAM instead of the AESA. A plasma-stealth system, limited to the J-20's AESA, can work extremely well, since there's already a space placed for containment, it's on the inside of the plane, and there's not a lot of space that needs to be blocked by a plasma.
It's also possible there's a plasma-stealth system being used on the J-20's radome. A key problem with stealth radomes is that the AESA electronics are inherently unstealthy, and for the radar to work, the AESA would have to be exposed. Using RAM on the radome results in a reduction in AESA sensitivity because the returning radar signal gets absorbed by the RAM instead of the AESA. A plasma-stealth system, limited to the J-20's AESA, can work extremely well, since there's already a space placed for containment, it's on the inside of the plane, and there's not a lot of space that needs to be blocked by a plasma.
vesicles
Colonel
What? He's the #1 bad guy in the movie! The baddest of all the bad guys.
airsuperiority
Captain
snowy tigers are always evil aren't they
---------- Post added at 02:04 PM ---------- Previous post was at 02:00 PM ----------
i know some, but i understand talking to them about JB is just as dangerous as, if not worse, than insulting islam in front of al-qaida; you probably won't get castrated by an al-qaida even if they do do anything to you, but no guarantees to the other group..
AssassinsMace
Lieutenant General
Did they remove the airbrake? In this pic it looks smaller and thinner than previously. Seems more like a panel now.
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