I wouldn't say the Su-27 is a copy of the F-15, that's a bridge too far, but I would say the J-11 is a copy of the Su-27. However, "Copysu" doesn't roll off the tongue as well as "Copyhawk.", Nevertheless, the J-11 is reversed engineering product of the Su-27, with Chinese characteristics, and the Z-20 is likely the same with the S-70.
It's not unfair to call it a copy of blackhawk, judging by the leak pic from few years ago, 99% of the military fans would mistaken it for a blackhawk at first glance.
It's almost impossible to build anything from scratch these days. In order to build anything slightly high tech, you would either have to have been doing it from the very beginning; or poach engineers, acquire existing blueprints, or copy something. Elon Musk didn't build Tesla on top of toy cars, he had to poach countless engineers from Detroit and silicon valley.
China is very new to modern helicopters. It produced less than a handful of models in the last few decades, even most of those were licensed from the French. Everyone starts from somewhere and copying is common. Trolls don't need to be so condescending about it, neither should pro-China fanboys try hard to deny it.
What most likely happened is AVIC took apart some of their remaining blackhawks and measured the crap out of it. They probably modified and updated a lot on top of the original design, while infusing techs from other choppers.
... I dont really want to lose him, he is a good member and quite knowledgeable .... but somehow he is consistently use "copyhawk" ... perhaps he is too upset of something ... I dont know
