yugocrosrb95
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Jet engine used in L-39 is turbofan that is half specific fuel consumption compared to J85-GE-21 and size of Yasin is partly due to relying on Owj turbojet.your considerations are excellent, but if you have to wait for an engine that isn't yet available, yesterday they wouldn't have presented the almost definitive Yasin but it was still on the designers' table.
OWJ is derived from the J85-GE-21, a very well known, tested, reliable and important engine that you have available today.
L-39 very good aircraft and the Syrians also use L-39ZA with good CAS characteristics, four pylons for a total payload of +/-1,300 kg and above all provision for a 23 mm GSh-23L double-barreled cannon fixed in a compliant capsule under the pilots compartment, but even these L-39s are not eternal and after an intense use in 12 years of war, Damascus will soon have to think about a replacement.
For example if Iran had acquired example of Ivchenko AL-25 for reverse engineering then Yasin could have been 1.5 tons lighter with minimal sacrifices.
Although size of Owj turbojet provides possibility for swapping out it for FJ44-4M equivalent engine if Iran upscales FJ33 derived turbofan Jahesh-700.
Though in long term it would be probably fit Iran more to reverse engineer and improve L-39 because then doubling of air fleet would be possible.