Arghh this guy! Those articles are so hard to translate. I have some free time. Can you forward both articles? Can't guarantee I'll be able to translate, but would at least like to read xP
J-20 5th Gen Fighter Thread IV (Closed to posting)
- Thread starter siegecrossbow
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You should be able to find the old essay in Chinese from this thread. As to the new essay, I do not have a link to that.
I doubt it is truly possible to get full RCS information on an aircraft without access to the blueprints and formulas necessary for a replica.
Shaping RCS is fairly easy to handle, through establishment of a model, but the absorption RCS and contribution of structural elements to RCS cannot be known without further details.
For example, an aircraft could have extremely optimized frontal RCS through the structural arrangement of subsurface elements and decisions made with coatings, but it could also have inferior or inadequate RCS off only 30 degrees from the front.
SOC, btw, aircraft apparently tend to be designed to have poor top / bottom / side RCS; ie, there's a ring of death perpendicular to the aircraft's frontal axis, but good luck getting a lock for long enough against that RCS ring to successfully track and guide a missile.
The Chinese may have their estimates for possible F-22 RCS shapes, but unless they hacked the data from the USAF and LM, they will likely not have enough data on the probable F-22 RCS distribution to be of decisive use.
Shaping RCS is fairly easy to handle, through establishment of a model, but the absorption RCS and contribution of structural elements to RCS cannot be known without further details.
For example, an aircraft could have extremely optimized frontal RCS through the structural arrangement of subsurface elements and decisions made with coatings, but it could also have inferior or inadequate RCS off only 30 degrees from the front.
SOC, btw, aircraft apparently tend to be designed to have poor top / bottom / side RCS; ie, there's a ring of death perpendicular to the aircraft's frontal axis, but good luck getting a lock for long enough against that RCS ring to successfully track and guide a missile.
The Chinese may have their estimates for possible F-22 RCS shapes, but unless they hacked the data from the USAF and LM, they will likely not have enough data on the probable F-22 RCS distribution to be of decisive use.
I'm not so sure. With enough time and a good knowledge of the sciences involved you can figure out quite a lot. When the laws of physics and chemistry are the same for everyone, theory can get you very very far. That said, I would be far from surprised if some of the information they hacked was specifically to fill in enough gaps to do a proper estimate of the F-22's RCS. Finding out important details about the weapon systems of other countries is one of the primary purposes of espionage.
What we're actually talking about is being able to reverse engineer an F-22 from just some pictures.
You'd need to know exactly what the F-22 looks like from the inside, then you'd need to know what RCS hotspots the F-22 generates due to the way it looks, then you'd need to know what kind of hotspot treatments would be necessary and special adjustments as part of seeking trade-offs between weight and RCS would be needed.
You'd need to know exactly what the F-22 looks like from the inside, then you'd need to know what RCS hotspots the F-22 generates due to the way it looks, then you'd need to know what kind of hotspot treatments would be necessary and special adjustments as part of seeking trade-offs between weight and RCS would be needed.
Not the whole thing, just its rcs performance, and not just through pictures. Again, I'm not saying you can get a 100% simulation, but you might be able to get pretty close. That kind of information is precisely the kind you can find through stolen blue prints, and even without a complete set they're not shooting in the dark. You can make good estimated guesses using knowledge of best practices.
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Engineer
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No, we are not. Are you sure you are on the right forum?
No you don't need to know what the F-22 looks like on the inside. Where did people get the idea that RCS has to do with internal geometries?
Wikipedia, where they discussed radar absorbent structures.
Lol, considering Wikipedia's reputation around these forums, I can't tell if you're simply stating fact, or also saying this is a bad thing.
I'll let you decide.
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