maybe already posted . source for that twitter post by wlvn
translation
"French pilots [on Rafale] regularly facing fifth-generation fighters [like the American F35] in inter-allied exercises note that the combat mission against stealth fighters is impossible to win with the current state of the sensors." Result: "In the event of engagement alongside its Western allies in a high-intensity conflict, the French fighter could be confined to the role of supporting fifth-generation fighters."
View: https://x.com/jdomerchet/status/1884231471407198384
article is behind paywall , but found another article
Lors d'une audition parlementaire, en juillet 2017, alors chef d'état-major de l'armée de l'Air et de l'Espace , le général André Lanata s'était inquiété
www.opex360.com
And to clarify: "French pilots regularly facing 5th generation fighters in inter-allied exercises note that 'the combat mission against stealth fighters on Rafale is impossible to win with the current state of the sensors."
While "radar stealth is certainly not enough to achieve air superiority," it is nevertheless an "undeniable asset, particularly in the toughest scenarios, unless low-altitude penetration missions are accepted, with a high level of risk," the authors of this study emphasize. In addition, they continue, "it could also become an entry ticket for front-line missions, and therefore a marker of influence for a coalition's strategic options."
Under these conditions, they warn, French fighter aircraft "could be confined to the role of 'supplementary'" in a "two-speed air coalition, in which 4th generation fighters will have their place." General Lanata had said nothing else almost eight years ago.
That being said, this "sensors" business is intriguing. If an aircraft like the F-35 can be "invisible" to certain means of detection [this is a priori not the case for passive radars and it depends on the frequency bands used], its infrared signature - with its F-135 engine - can betray it. The IR channel of the Optronic Front Sector [OSF] of the Rafale would be able to detect it face to face, subject, however, to weather conditions.
Incidentally, the Rafale will soon be equipped with an improved OSF, the General Directorate of Armaments having recently conducted tests on a new optic on the infrared channel of the OSF, this being supposed to improve the "image quality of the Night Identification function".