Bhaiya Ji, they don’t even have a RCS facility, then how they finalised airframe design without it and calling it stealth aka VLO. There are no shortcuts for these.
Turkish Aerospace (TUSAŞ) is investing substantially in carrying out Radar Cross-Section (RCS) tests to develop aerial platforms. The test bed will be used primarily for Turkish Fighters (TF) and other indigenous projects. Turkey’s most prominent and the world’s 5th largest radar cross-sectional...
www.turdef.com
There are lots of dubious cases in KAAN, which we shouldn’t discuss here.
KF-21 is far more a believable story, they kept the things simple, even forging bulkhead with aluminium instead of titanium.