一个外国军迷Martian认为j20的rcs值是 0.005-0.0001 m2 ...

http://www.indiandefence.com/for ... -j-20-discuss-4136/
一个外国军迷Martian认为j20的rcs值是 0.005-0.0001 m2 (or -30 to -40 db)， T-50's RCS > 1m2 ，t50隐形不如20,22,35我认为还是比较中肯的！

From the front, the J-20 matches the F-22's stealth profile. While the J-20 is flying at you, the incremental increase in area from its canards is minimal (e.g. look at a piece of paper edge-wise; you only see a line). Also, the J-20's canards are probably made of composite material, coated with RAM, and curve-shaped to deflect radar waves. For all intents and purposes, the J-20 has a F-22 RCS frontal profile of 0.0001 m2.

From the rear, with its circular saw-toothed engine nozzles, the J-20 looks like the F-35 and it should have a similar rear RCS of 0.005 m2.

In conclusion, depending on your point of view, the J-20's RCS ranges from 0.005 to 0.0001 m2 (or -30 to -40 db).

We know T-50 is inferior in stealth to French Rafale, which means T-50's RCS > 1m2
According to GlobalSecurity, the French Rafale has a RCS of 1 m2. Since the Rafale has most of its engine blades shielded by an almost-serpentine air-inlet, the T-50's fully-exposed engine blades will cause the T-50's RCS to be greater than the Rafale's 1m2.

However, the T-50 has a shaped-nose. This means the T-50's RCS is probably a little lower than a F-16. My best estimate of the T-50's RCS is 3m2. (See GlobalSecurity RCS chart below. The T-50's RCS is most likely bound by the F-16 as an upper limit and the French Rafale as the lower limit.) Exposed engine blades are a glaring deficiency for stealth. However, I awarded points to the T-50 for having a shaped-nose, canted air-ducts and tails, and planform alignment.

The Russian T-50 prototype falls far short of expectations (e.g. does not meet most of the ten criteria that I have formerly listed for a stealth fighter design). The biggest failing is in the design of the air inlets. The Russians didn't bother at all to shield the engine fan blades from enemy radar. Also, the metal frame on the cockpit canopy is another clear lack of effort.

If you believe my opinion is unfair in saying that the Russian T-50 falls far short of a modern fifth-generation stealth fighter, would you accept the opinion of an expert instead? Four-star general Roger Brady does not believe that the Russian T-50 qualifies as a fifth generation stealth fighter: “I don’t know if it’s really a fifth-generation aircraft” (see article below).

In conclusion, I am willing to revise my assessment of the Russian T-50, as judged by my list of ten objective stealth design features, if there is a serious re-design. I stand by my claim that the current Russian T-50 design (if allowed to stay mostly intact) is not a worthy competitor to China's J-20 or U.S. F-22 and F-35.


Radar Cross Section (RCS)

Radar Cross Section (RCS) / RCS (m2) / RCS (dB)

automobile 100 20
B-52 100
B-1(A/B) 10
F-15 25
Su-27 15
cabin cruiser 10 10
Su-MKI 4
Mig-21 3
F-16 5
F-16C 1.2
man 1 0
F-18 1
Rafale 1
B-2 0.75 ?
Typhoon 0.5
Tomahawk SLCM 0.5
B-2 0.1 ?
A-12/SR-71 0.01 (22 in2)
bird 0.01 -20
F-35 / JSF 0.005 -30
F-117 0.003
insect 0.001 -30
F-22 0.0001 -40
B-2 0.0001 -40

t50与27，j20腹部比较图

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27.JPG (38.06 KB, 下载次数: 19)

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http://www.indiandefence.com/for ... -j-20-discuss-4136/
一个外国军迷Martian认为j20的rcs值是 0.005-0.0001 m2 (or -30 to -40 db)， T-50's RCS > 1m2 ，t50隐形不如20,22,35我认为还是比较中肯的！

From the front, the J-20 matches the F-22's stealth profile. While the J-20 is flying at you, the incremental increase in area from its canards is minimal (e.g. look at a piece of paper edge-wise; you only see a line). Also, the J-20's canards are probably made of composite material, coated with RAM, and curve-shaped to deflect radar waves. For all intents and purposes, the J-20 has a F-22 RCS frontal profile of 0.0001 m2.

From the rear, with its circular saw-toothed engine nozzles, the J-20 looks like the F-35 and it should have a similar rear RCS of 0.005 m2.

In conclusion, depending on your point of view, the J-20's RCS ranges from 0.005 to 0.0001 m2 (or -30 to -40 db).

We know T-50 is inferior in stealth to French Rafale, which means T-50's RCS > 1m2
According to GlobalSecurity, the French Rafale has a RCS of 1 m2. Since the Rafale has most of its engine blades shielded by an almost-serpentine air-inlet, the T-50's fully-exposed engine blades will cause the T-50's RCS to be greater than the Rafale's 1m2.

However, the T-50 has a shaped-nose. This means the T-50's RCS is probably a little lower than a F-16. My best estimate of the T-50's RCS is 3m2. (See GlobalSecurity RCS chart below. The T-50's RCS is most likely bound by the F-16 as an upper limit and the French Rafale as the lower limit.) Exposed engine blades are a glaring deficiency for stealth. However, I awarded points to the T-50 for having a shaped-nose, canted air-ducts and tails, and planform alignment.

The Russian T-50 prototype falls far short of expectations (e.g. does not meet most of the ten criteria that I have formerly listed for a stealth fighter design). The biggest failing is in the design of the air inlets. The Russians didn't bother at all to shield the engine fan blades from enemy radar. Also, the metal frame on the cockpit canopy is another clear lack of effort.

If you believe my opinion is unfair in saying that the Russian T-50 falls far short of a modern fifth-generation stealth fighter, would you accept the opinion of an expert instead? Four-star general Roger Brady does not believe that the Russian T-50 qualifies as a fifth generation stealth fighter: “I don’t know if it’s really a fifth-generation aircraft” (see article below).

In conclusion, I am willing to revise my assessment of the Russian T-50, as judged by my list of ten objective stealth design features, if there is a serious re-design. I stand by my claim that the current Russian T-50 design (if allowed to stay mostly intact) is not a worthy competitor to China's J-20 or U.S. F-22 and F-35.


Radar Cross Section (RCS)

Radar Cross Section (RCS) / RCS (m2) / RCS (dB)

automobile 100 20
B-52 100
B-1(A/B) 10
F-15 25
Su-27 15
cabin cruiser 10 10
Su-MKI 4
Mig-21 3
F-16 5
F-16C 1.2
man 1 0
F-18 1
Rafale 1
B-2 0.75 ?
Typhoon 0.5
Tomahawk SLCM 0.5
B-2 0.1 ?
A-12/SR-71 0.01 (22 in2)
bird 0.01 -20
F-35 / JSF 0.005 -30
F-117 0.003
insect 0.001 -30
F-22 0.0001 -40
B-2 0.0001 -40

t50与27，j20腹部比较图

501.JPG (53.58 KB, 下载次数: 19)

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2011-8-22 14:14 上传

27.JPG (38.06 KB, 下载次数: 19)

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2011-8-22 14:24 上传

20.jpg (111.56 KB, 下载次数: 20)

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2011-8-22 14:14 上传