I don't recall this being posted before.
(1800 x 1145)
(1800 x 1145)
Sure, other kind of selective bandpass material has been mass produced and used by the aircraft you mentioned. But are they the same as this kind (see the picture below)? Are these aircrafts using this one? I am sure you can see the difference. The caption says "perfect lens of metamaterial developped by Duke University". Will you still insist this is not exactly an artisan "craft"? (no need to answer though, as I am not into the definition of great or ordinary).Well, radome bandpass materials have been mass produced enough to equip well over 1000 fighters to date (180 F-22, 520 Eurofighter, 160 Rafale, 250+ F-35) and counting. It's not exactly an artisan craft
Maybe I'm being thick, but I still don't quite see logically why it has to be exactly the same to qualify as a metamaterial? Is a delta wing only a true "delta wing" when its LE sweep angle is precisely 53°? Was Intel's SSE not a SIMD extension set because it wasn't exactly the same as AMD's 3DNow! counterpart?Sure, other kind of selective bandpass material has been mass produced and used by the aircraft you mentioned. But are they the same as this kind (see the picture below)? Are these aircrafts using this one? I am sure you can see the difference.
What I meant with that comment is merely that to have been deployed on the scale indicated, the manufacturing process must have attained a decent level of industrialization (i.e. well beyond lab scale or individual craft in output and fidelity). I'm sure it's possible to do better nowadays - but is a carbon fiber wing not a carbon fiber wing unless it has been built with Irkut's pioneering out-of-autoclave process (MS-21)? I think you get my driftWill you still insist this is not exactly an artisan "craft"? (no need to answer though, as I am not into the definition of great or ordinary).
It is definitely worthy of mention, as it all but confirms the presence of an important RCS reduction technique on the J-20 that can't be verified from normal aircraft photos. You know there will always be people who will refuse to believe unless they get such evidence (take the crowd who to this day insist the Su-57 has not tested its weapons bays in flight because no photos have been published, even though a leaked progress report slide dating from early 2014 states point blank that it had already happened by then).The CCTV program claimed this type and ONLY this type to be mass produced. I hope this is clear. Other than that, I am not interested in arguing whether one see this new material worth of notion, or worth to be seen as a breakthrough. We may think differently.
A typical problem with buzzwords. One has to realize that they may not be universal (i.e. differ between languages and even OEMs) and be intellectually flexible enough to recognize the basic principle rather than rigidly sticking to the catch phrase.I think what’s missing in this discussion around metamaterials is the very basic point of *what* a metamaterial is. Specifically, what makes a metamaterial a metamaterial is that its properties are derived from the structured spatial arrangement of its consitituent elements, not from inherent properties of those elements themselves.