I don't usually reply to posts like this but I felt compelled. Maybe if this is repeated enough times it will become common knowledge. I apologize in advance. I probably will get out of line. Nothing personal intended.
Not really. Producing a new aircraft doesn't improve your aviation sector on its own. Producing aircraft that 1)satisfy a need of a customer 2)willing to pay the price, 3)in large numbers 4)consistently for many years, improves aviation sector. Also, involving private sector. Doing JF-17 Lego won't, sorry.
Absolutely not. If we utilize your lego Jf-17 approach what we'll have is an aircraft which will be much heavier. The wing area will be much less than what is needed. It will actually take off in a longer distance (I assume this is what you mean when you say "greater capability to lift off"). Its payload will actually go down not up. That second engine probably added 1500 kg of weight. Sadly, thrust alone doesn't increase payload. You get diminishing returns if you just increase thrust.
I
guarantee your aircraft will have a lower T/W than the JF-17.
Sure.
Okay? How is that a gain when you have the turning performance of a rock? And you can only fly 200 km tops?
And have you thought about whether the PAF (or anyone else) wants the next generation of JF-17? From what I know PAF wants to focus on the JF-17 and go to next gen.
Also 15%? I wonder where you got that number from.
MAYBE if you would have been talking about replacing a big RD93 with two smaller engines I would've thought about a JF-17 iteration. But cramming two engines together is much harder than copy pasting it in a 2D picture.
No. It is actually very quantifiable. It isn't priceless. It is actually part of the development cost that you just talked about. Furthermore, because it is a finite cost, you can do a cost benefit analysis to see whether it is worth it (hint: it's not)
I think you have mistaken the word modular to mean LEGO.
Do you know what an aircraft with two RD-33s, and a twin-tail is called?
It's called a MiG-29
I would suggest you look at the MiG-29 and think long and hard about why the designers of JF-17 don't make a MiG-29 out of it. Is it a step forward? sideways? or backwards?
And then ask yourself if PAC wanted to produce the MiG-29 couldn't they? Why don't they? Does PAF want it?
Yes they could. They don't want to. PAF doesn't want it. Also the international market doesn't want it. That spot is filled by the MiG-29.
Then, ask yourself whether taking a SMALL JF-17 and sticking two engines in it (God knows how) is better or not (in ANY way), than having a properly designed MEDIUM weight fighter like the MiG-29 (assuming that, that is what PAF wants).
I'll try my hand at analogies. You're trying to put a horse's heart in a human. Aircraft are usually designed around the engine (or engine class) and you will go too off optimum if you do something crazy like stick 2 RD-93s together.
I cannot stress enough how unreasonable this idea is from an aircraft design perspective. Please ask questions if you don't understand anything I've tried to explain.
Try
skimming through some of the classical preliminary aircraft design books such as:
https://books.google.com/books/about/Aircraft_design.html?id=Q9QeAQAAIAAJ
https://books.google.com/books/about/Airplane_Design.html?id=usXVaf8Qu0cC
https://books.google.com/books/about/Aircraft_Performance_Design.html?id=Ck9l1DGj5-4C
to get a "feel" for how aircraft are designed and built.