CEO of TAI had an interview a couple days ago:
"Now, Kaan's engine, as you know, is being developed in collaboration with TEI and TR Motor. Yes. The PDR phase was completed last week. We moved on to the CDR. This was an important phase. In other words, the design has emerged. What will it be like? What will be there? What will be placed where? What interfaces will affect the interior design of the aircraft, its weight, power, etc. These are now frozen as a concept. One of them has been chosen, and this is the stage where the final design details are started. This takes approximately
1 to 1.5 years. In the meantime, sometimes risks are taken, and parts and systems that will take a long time to procure are worked on beforehand, and quickly, I think, we plan to start the
first prototype tests in the 2028-29 range. So we will put it
on the aircraft in the 2029-30 range. It's progressing fast right now, but we need to speed up even more."
Apparently they are aiming for a
bee size RCS for the Kaan: