Your earlier post only.
Had we accepted from the offer of Su-54, we could have ended up with a Russian jet (Russian design, Russian Engine, probably weapons, Elta Radars, Indian Aviocs & French tech. too) So what is all about our 'own' fighter there. It is like JFT to Pakistan from China. JFT is basically a Chinese fighter isn't it.
If they only purchase engine & design from them and we make else everything, it make sense.
That is a very big misconception.. but to deviate no further from the topic.
lets put it as briefly as possible. till 1999 there was little to show for the Fc-1 design apart from minor concepts and blueprints.
When a PAF team visited China in 2001 to assess the program..they were shocked to know NOTHING had moved forward.
It was then that an emergency rotation of some 100 engineers by the PAF was deputed to Chengdu to work with the Chinese and expedite plans. To the extent that the College of Aeronautical engineering at Risalpur saw quite a bit of its faculty and immediate graduates disappear on rotations to Chengdu. All these people were deputed to the Chief Designer of the JF-17 and it was these people that got it moving along. So to call it a Chinese aircraft is extremely unfair to those men.
Which is why it is called a co-production.
Coming to the question of the S-54... you could have purchase the design.. and work on it.
It did not have to look exactly like that, just using that as the building block.. perhaps it may even have incorporated Levcons from the start.. perhaps an S duct.. That depended on HAL engineers.
It may not have needed a Russian engine. A redesign of the engine bay could have been done.
So a lot of IF's in the process.
Here is the biggest IF, would it have been easier to pull off than the current design of the LCA? Or, more appropriately.. did it have better growth potential than the current LCA?