I completely agree with this view .... and therefore, let's ignore those arguments (those who want to discuss that aspect can do so, elsewhere).
The question is .... if reverse engineering (RE) .... can't help for complicated things (e.g. F-22), then that's a definite constraint. And leave alone F-22, even China has failed to reverse engineer Aircraft engines, so far.
Second, even if technically feasible, but too costly to actually do it .. it again become useless.
If either of the two constraints above, were not to apply, ..... I wonder why India does not reverse engineer Su-30MKI !!!
(Just like China reverse-engineered Su-27)
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Su-27 has been successfully reverse-engineered ... that is true.
But does anyone know, the economic costs involved in doing that. Was it worthwhile ?
This question is much more relevant in light of the following facts:
1. China can buy Su-27, as it can buy A-320
2. But, China chose to reverse engineer Su-27, but not A-320
3. Reverse engineering of Mig21 has valid different reasons (which do not apply to reverse engineering Su-27.
e.g. India had no reason to reverse engineer Mig21 becaue India could have bought it. China was not offered Mig21, after 1959. So, China had the motivation (irrespective of the costs of such reverse engineering).
But the same reason as Mig21 can not be applied further to Su-27.
China can buy Su-27 (as India can buy Su-30MKI) ..... but China chose to reverse engineer Su-27, but India didn't.
The reason of this behaviour is worth exploring.
It will give insight into (i) How complicated reverse engineering is technically, and (ii) did it make economic sense for China to reverse engineer Su-27
As to your question why China chose to reverse engineer Su-27 and India didn't...
Ans: China's policy is different from India. And like it or not, CHina had a bigger manufacturing industry with more money as compared to India. Plus what is there to ponder?
China took up a policy to be self-reliance, this way, they gain technical knowhow and could manufacture their aircraft without external aid (or with as little as possible). India might not want to take this approach as they might find buying aircrafts are cheaper and easier.
However India had a very establish shipbuilding problem that actually build aircraft carriers...
As to your question on cloning or reverse engineering F-22... I am wondering how could anyone come up with such an obvious question... Su-27 - China had a licence with Russia which also provided them with kits and most probably blueprints and every technical know how... F-22 - no kits, no technical know how, no blueprints - how to clone?
You really think that by looking at a aircraft, most probably from some internet photos and you can reverse engineered that aircraft. If that was the case, then China should already have huge fleet of F-22 flying.
China could buy Su-27... but they chose not just to buy Su-27, but licence built these aircraft, when they have enough knowhow they started their J-11B program, which was a radically better plane then a normal J-11.
As to A320... many had already advises and pointed out why they don't reverse engineer this aircraft, so let it rest. The only thing I can tell you is... reverse engineering something illegally, is not what CHina wanted to be accused of now. ANd it is economically not correct, because you cannot sell these patented product overseas... China's domestic market might be big... but they are not that big!