There is a lot of difference between 4.5 gen and 5th Gen planes, And its impossible for a 4.5th Gen to get that 0.5 to cross the threshold, It is not just steatlh and sensor fusion or rather its not so simple as you say, Only the design is superficially same, there is supermanuverability, and extreme performance. So if you do put up a pair of 4.5 gen planes against 5th Gen plane, each time the 5th Gen plane will win, This is the scenario, Thus theoretically 1 5th Gen plane is as capable as 2 4.5th Gen planes, but when the numbers of 4 or 4.5th gen are increased the odds will tend to move towards 4.5th Gen planes as then number becomes crucial,. If say it takes say 10 4.5th gen planes to take down 5th gen planes losing 9 of its nos, then still its worth to go for 5th gen plane, Most of the technology for PAKFA is ready, Item 30 engine is being tested and developed as we speak, and they expect the production to start by early 2018
India can design planes, but does IAF want planes made by HAL? Please dont compare the airframes of WW2 with present airframes. if you want I shall explain.
WW2 airframes were very simple when you compare them to present airframes
The materials then were wood or aluminum or steel, now they use special alloys to make it light
One of the biggest bomber of WW2 B-25 Super fortress carried 9 tons of bombs, A single Rafale can do that,
3 Tejas can do that, B-25 needed 4 engines to do that, Rafale needs 2 and Tejas will need 3 and it will carry more load. The crew of that plane was 10, Rafale will use just 1.
The engine making them was simple as engine was simple, the material used was not that complicated to make, But engines now are made from SCB which itself is dififucult technology to master.
During WW2, you can just take a plan and make the engine or plane, Japan did it from German plans, but now, its not just the design but also the material. BTW did WW2 planes have radars that could look at say 150 kms and track targets? Did they fly 55000 ft high?
You are actually comparing apples with photo of an orange , and its big difference, Do you know the houses that we live in, the very cost of the same, I could buy 3 WW2 fighter squadrons.
I like Tejas and want to see it in more nos, but there is still FOC waited, and then would begin the Mk2 Saga, Dont know where it will lead to. Actually we need more 4.5 gen planes, because though these planes are not as capable as 5th gen plane, they are way cheaper to use, operate and maintain, and that makes a big difference in budget.
Now, coming to the various nos of planes that you named, Just to inform you a squdron of PAKFA can see them from say 200 kms away, engage them at say 100 kms and destroy say 160 of them and these lakhs plane would not even see PAKFA or who actually is hitting them, If you had seen star trek, then for these WW2 planes that would be like facing Romulans with cloaking device..
5th generation fighter and 4.5 generation fighter has very little difference. Only stealth and sensor fusion aspect changes. Even FA18 Hornet has sensor fusion though it is 4.5 generation.
I don't seem to understand what is the requirement of FGFA when they themselves are still developing technology and won't have them till 2020. India is working on AESA, EW suite, SAR, EOTS and are progressing well. EW suite and AESA have been developed in phase 1. More powerful AESA and better EW suite is needed and that is being developed.
Can you tell. Me what is magic in it?
You don't seem to understand the difference between prototype and real plane. If India can design Tejas, India can also design AMCA. First flight is just a formality. The most important part of AMCA is avionics, not the airframe. Airframe is something even 2nd world war people could make. The whole point here is about avionics. Once Avionics are developed, it is only a matter of time.
As the article itself told, Tejas Mk2 is set for 1st flight in 2021 and induction date is 2023. Similarly, AMCA first flight is 2020 and induction is the 2030. Even Russia started the FGFA plan in 2010 and design was finalised only in 2013 (designed along with India). They are stated to induct it from 2020. Similarly, with proper funding, India can also make its AMCA by 2030.
World war 2 plane manufacturing was -
USA - 3lakh
Germany - 2lakh
USSR - 1.6 lakh
Do you really think your set of 100 planes even matter?