In 1944, during
World War II, Joachim Hänsler of Germany's Ordnance Office proposed the first theoretically viable railgun. By late 1944, the theory behind his electric anti-aircraft gun had been worked out sufficiently to allow the
Luftwaffe's Flak Command to issue a specification, which demanded a muzzle velocity of 2,000 m/s (6,600 ft/s) and a projectile containing 0.5 kg (1.1 lb) of explosive. The guns were to be mounted in batteries of six firing twelve rounds per minute, and it was to fit existing
12.8 cm FlaK 40 mounts. It was never built. When details were discovered after the war it aroused much interest and a more detailed study was done, culminating with a 1947 report which concluded that it was theoretically feasible, but that each gun would need enough power to illuminate half of
Chicago. <Wikipedia>
You can write your Mahabharata on this but research papers are a dime a dozen. Only ones that receive funding grants and create Proof of Concept end up with something.
(so how many have written Mahabharta from the research papers)
Here is your query about engine intake.
http://defenceupdate.in/hal-tejas-mark-2-advanced-variant-of-lca-tejas/
https://idsa.in/idsacomments/tejas-one-year-after-induction-hal_sbmaharaj_120717
I
Look to think tanks and strategic groups not losers who publish articles for gun porn lovers and newbies. NPTEL is also great for theoretical lectures in case you have problems. I find the lectures and discussions great.
Actually took a lot of documents from there.
P.S: It's good to be patriotic but don't be like Pakis who think their JF 17 is like F 22. It gives a general impression of Indian stupidity and incredulity to outside visitors. Keep mum if you have nothing to mention.