We also not only have access to LOW BYPASS TF-30's but have years of experience working with them and know exactly where it's flaws are and what parts to try to redesign & or attempt to improve upon....We have access to FJ-44 or at least FJ-33 since rq-170. And do you believe Al-21 would be suitable for heavy iranian airplane that will come at least 10 to 15 year in future . we are working on f-5 size airplanes . we start production of jahesh-700 . the next step is moving from that not moving from J-85 .
By puting developement money on turbofan engine not vasting it on turbojet engine.
That high trust fighter wont come sooner than 10 to 15 year in future and till then we only see airplanes in size of f-5 and big drones and engines like FJ-44 and what we can improve on it is what we need not Al-21 like engines that wont help us in developing a heavy turbo fan engine.
And we are not supposed to use Jahesh 700 in those aircraft . we are supposed to learn from it and develope it to the next step which is something like FJ-44 which is good for big UAVs and light trainer and het and then develope heavier engine in class of Al-31 or F-414 and RD-93
Production of Fj44 may be good for civilian use and should be taken up by civilian organization or Iran's civil aviation but it's R&D & production cost both in terms of funding and human resources most definitely should NOT be coming out of the budget of Iran's Defense Industry or Iran's Air Force.
Production of yet another weak engine for yet another light fighter/trainer does not address Iran's requirements for interceptors
Every country has limits to it's resources and the consequences of putting resources into yet another weak engine means that the time frame of 10-15years for a high thrust heavy fighter will yet again be delayed for yet another decade!
I don't think there is a single country on the planet that has gotten as much use out of it's fleet of fighters (any fighter) than Iran's gotten out of it's F-4's & F-14 however, innallaha la yohebbul mosrifeen ham haddi darreh! It's like saying I'm gonna go barefoot so I don't waist money on shoes and end up paying 1000 times more in doctor fees as a result...
how many subsonic jet trainer designs is Iran going to waist it's limited resources on? enough is enough!
In terms of low thrust engine the natural course of improvements and development of OWJ and Jahesh-700 engines will be sufficient to accommodate Light Fighter, Trainers & UCAV's
As for UCAV's, j85's are comparatively easy to mass produce which makes them ideal for UCAV's and Iran can potentially design a twin engine supersonic UCAV around that engine
For the next decade the priority needs to be high trust high speed fighters to address Iran's requirements for Interceptors/Air Superiority fighters and Iranian researchers & engineer need to work on developing the tools and infrastructures needed to produce high trust engines and conducting R&D on more powerful powerplants with the goal of one day producing an engine capable of sustaining 2000kph not some low thrust engine that's never been put on anything faster than the Karrar UCAV.
And working on improving AL-21 or TF-30 would get Iran far closer to the AL-31 than the production of the Fj44 or Jahesh700 ever could!