Here’s what we were told by a test-pilot as we walked around the aircraft: “We routinely supercruise with this fighter on test-flights”. The next day, over dinner, the people who actually run the Indian F-16 campaign (including a veteran Falcon pilot) said that the pilot in question had maybe got “carried away” by the moment. What he really meant to say, apparently, was that the Falcon routinely went supersonic in dives for a few seconds. Ok, even Hawker Hunters could break the sound barrier in dives, so this isn’t such a big deal. And anyway, the definition of supercruise is the capability of an aircraft to cruise at supersonic speeds without engine reheat during sustained level flight. The General Electric F110-GE-132 turbofan that powers the Block 60 cannot push the Falcon into level supersonic flight without wet power. It’s that simple.
As it turns out, the concept and reality of supercruise technology are not as simple as they appear. The F119-PW-100 which powers the Raptor and the Typhoon’s Eurojet EJ200 are considered the only rate production turbofans that can push the airplanes they were designed for into the realm of supercruise. The F-35’s F135 and F136 turbofans are not designed for supercruise — there are those who feel that this alone is enough to erode the aircraft’s fifth generation status. Either way, the MMRCA RfP doesn’t ask for a supercruising aircraft. The advantages of supercruise are still not sharply defined. The pros aren’t all black and white — supercruising still chews jet fuel like pop corn compared to subsonic flight for the same distance. And engine wear and tear in supersonic flight is not lower enough than that caused by reheat to carve out for itself any unique advantage. Like the people here said, making supercruise capabilities second nature to modern turbofans is one of the most funded parts of jet engine and integration research today.
Well, to end on a lighter note, here’s something that should tell us all a good deal about the IAF’s legendary woes with Russia: the RfP for the MMRCA says that all spares for the chosen fighter should be “brand new”.