a reply to: anzha
There are multiple ways to get a fifth gen fighter.
are several in-house designs from Boeing.
None of them look like an F-22...
People use/borrow the F-22's design features because it works and they don't need to reinvent the wheel. That does not make those design features the
only or even the best solutions to design requirements.
ATF, JAST, MRF, CALF, ASTOVL, JSF, etc. A myriad of more or less unique designs to different requirements which would all meet fifth generation
The F-22 shape is just the most studied and "pre-developed" to invent a term, for a design team to begin with. Since development time and RCS study is
expensive, you see it a lot.
Even within the F-22 family evolution we've seen that you could change the wingshape and/or add a lerx to gain maneuverability, change to a delta to
increase range and payload and supersonic performance, go to variable sweep for a broader range of efficiency and short-field/low-speed performance,
and still meet performance and signature requirements.
But the vast majority of 5Gen fighters coming off smaller efforts all seem to "heavily leverage" (to be kind) the F-22 experience.
I'm not making a moral or ability judgement. And there's no reason that smart people from any nation could not develop a unique (from the F-22)
fifth-generation approach. That would just cost a lot more money and time. So they don't.
The Su-57 went it's own way emphasizing maneuverability and range. J-20 is handicapped by material and production technology and powerplant questions,
but is in many ways driven by more "modern" requirements than the F-22 requirements emphasizing supersonic maneuverability and range. It also
leveraged previous work. Which there is nothing inherently wrong with.
From a practical standpoint because of the prohibitive costs involved, it makes good sense to leverage that work. From a pure design/performance
standpoint, it would be better to develop your own design optimized to more operationally relevant requirements than the F-22's forty year old
approach to outdated operational presumptions (that is not a slag on the F-22, but looking back, I think you'd see the air force take a different
approach to ATF and JSF than they took. And the F-35 design de-emphasized many of the things everyone thought was essential in the ATF program. An
eventual next-step will have completely differently weighted requirements than either as well.)