^ oh no, you should have told Sukhoi about it as they forgot to add DSI to the Su-57.
While you’re at it, Lockheed and Boeing too since their 6th gen concepts are missing it! how could they forget to add it!?

DSI has a speed limit. IIRC, fighters with DSI will not exceed Mach 2.0. Original J-10/10A with the vanila AL-31FN supposed to have reached mach 2.2 (I’ve heard as high as Mach 2.3) at altitude. The newer J-10B/C despite having more powerful AL-31FN variants, will not exceed mach 2.0. Max speed must be around Mach 1.8 maybe mach 1.9. Su-57 is supposed to be a high speed fighter (Mach 2.5+). It has variable inlets.

Importantly, China has a major weakness when it comes to high powered turbofans compared to the US as well as Russia. So they will do whatever they can to reduce the weight of fighters until there newer generation engines come into force. DSI helps reduce weight, complexity, maintenance cost as well as helps reduce the RCS. US does not have that limitation. US flew YF119 and YF120 wa back in 1990.

Regarding 6th gen US concepts? Those are ‘concepts’ they’ve released for the public. What the final product might include is unknown to any of us outsiders. And as I said before, the US does not have engine limitations.

J-20 with Lunenberg lens…must be the ones allegedly picked up by indian radars.

All production J-20s whether demo flights/flypast or aggressive training with other PLAAF aircrafts appear to carry Lunenberg lenses. Even the later prototypes (especially #2017) used Lunenberg lenses. These are very young birds and early days for the PLAAF when using 5th gen aircraft and they will do everything to hide its true RCS. There were rumors (from SDF?) that J-20 had to use Lunenberg lenses even when going up against aggressors comprising of KJ-500 and J-10B as well as ground based assets including S-300. And these newly released footage suggests that maybe true. PLAAF will be extremely protective of the J-20 and will not be risking it near the border of any country without masking its RCS. They might (stress the might) fly near a border of a country if the RCS is heavily masked and their motive was to test the J-20 passive senors. J-20 is packed full of senors of varying types with 360 degrees. It is a signal sucker/leech. Any aircraft that flashes its radar at the J-20 probably compromised itself by doing so. But again the PLAAF is unlikely to risk the J-20 flying near borders of other countries. They will first use it against J-10B/C, J-16, Su-35, KJ-500, KJ-2000, etc extensively before sending it out on risky mission. It will take the PLAAF years to develop tactics for 5th gen warfare. I mean how long did it take the USAF to adapt to the F-22?

055 front

HQ footage of J-20, J-16, J-10C

Divine Eagle HALE UAV taken flight

Sisters:

And back in time:

Via PDF – Link: 055 #1, #2, #3 and #4