The characteristic stealth shapes and angles are clearly based on the F22. Their cyber-espionage appears to be paying off. 'The J-20 has a canard delta layout (like Chengdu’s J-10) with two canted, all-moving vertical stabilizers (like the T-50) and smaller canted ventral fins. The stealth body shaping is similar to that of the F-22. The flat body sides are aligned with the canted tails, the wing-body junction is cle…
Nothing about the fact that the J-20 looks like the F-22 implies cyber-espionage. If I were trying to build a stealth fighter, the first thing I'd do is look at pictures of it and make something that looks similar. (Since aviation week, or whoever, was able to tell what the angles of the J-20 are, I assume China would have no problem figuring out the shape of the F-22 from the numerous pictures available.) Even if yo…
Aerodynamics relies heavily on having a good computer-assisted flight system, since stealth shapes tend not to be aerodynamic.