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

[rhino123]

How can we be sure the engine now running on J-20 is not WS-15?

Have you seen one (WS-15) running on J-20? Any photo? Or did they fly in secret that no one knows of?

I certainly do not recall seeing a photo whereby the J-20 fly using the WS-15.

 

[Air Force Brat]

Official statements by the air force indicate that the RCS of the F-22 is approximately that of a marble, so 0.0001 m^2 is likely to be correct. The F-35 is supposedly that of a golf ball.

Of course, no statement was ever made about what band the RCS figure is for, or from what aspect.

0.0001 m^2 is almost certainly correct as a minimum RCS of the F-22 in the X-band, where its RCS reduction is optimized.

The F-22 remains very stealthy, a lot depends on maintenance, but it is very unlikely to be detected by anyones airborne radar until it is too late, it is looking like a very potent platform at a very good price in retrospect, the F-35 costs have ballooned and it will likely cost more than the F-22 until large scale serial production begins. I would imagine that Chengdu will try to get more birds up this year, I am flabbergasted that 2003 has not been launched, it may be that they will launch several in close succession, or that they are holding out for the upgraded powerplant. brat

 

[thunderchief]

If J-20's engine compartment is sized for a larger diameter engine than the al-31, it could still be adopted for the al-31. Maybe someone can do photometric analysis of j-20's intake dimensions and see if they seem sized to handle more airflow than the al-31 requires. If so, then it seem a safe bet that WS-15 would turn out to be fatter than al-31.

J-20's intake is certainly designed to handle more airflow than the AL-31 requires , you can bet on that . Btw , inlet diameter of AL-31F should be 905mm , and of 117S 932 mm . Inlet of the WS-10A is reportedly 950 mm . I don't know dimensions of 117 (AL-41) or WS-15 , but I bet they are in the same range and all of the mentioned engines could be installed (with some modifications ) on J-20 or maybe even on J-11 (J-11 probably could not use full AB power of the latter ) .

 

[Deino]

Is this a new image ... or an older one from the last series !??

Deino

 

[nkvd]

The only place where WS-15 is flying is on this thread as far as i can see.But i have to admit my search is rather limited by my being unable to read Chinese. Cant wait to see real specs of this engine.As for the radar that is said to detect the F-22 200km away ,feel free to believe that but i will only believe those figures when AVIC offers an export version

 

[Blackstone]

As for the radar that is said to detect the F-22 200km away ,feel free to believe that but i will only believe those figures when AVIC offers an export version

Exactly how I see it too.

 

[Engineer]

The only place where WS-15 is flying is on this thread as far as i can see.But i have to admit my search is rather limited by my being unable to read Chinese. Cant wait to see real specs of this engine.As for the radar that is said to detect the F-22 200km away ,feel free to believe that but i will only believe those figures when AVIC offers an export version

There is no logical inference between the figures being believable and the radar being offered for export. Going by your same line of thinking, F-22's performance figures are not believable because the aircraft is not offered for export.

 

[thunderchief]

There is no logical inference between the figures being believable and the radar being offered for export. Going by your same line of thinking, F-22's performance figures are not believable because the aircraft is not offered for export.

Even if assume that F-22 has RCS of 0.0001 sqm (and they say it is much lower ) to able to detect it at 200 km , that radar would have to detect standard fighter-sized target of 5 sqm at 2990 km !! That would be one hell of the radar !

Of course , we could assume that radar works in different band (Russians are already working on L-band AESA radar for PAK FA ) but then it could not give accurate enough firing solution .

 

[Player99]

There is no logical inference between the figures being believable and the radar being offered for export. Going by your same line of thinking, F-22's performance figures are not believable because the aircraft is not offered for export.

Almost exactly what I was thinking while reading that remark... In addition, I was going to say: Feel free not to believe, I know PLA won't export that thing just to make everybody believe it.

 

[siegecrossbow]

Closeup of the mid-air refueling probe port: