This is the first time in my life -I am 54 y.o- I hear such things. Are U an engineer? Specialist? Could you develop more, please?
Actually, VIVAK is very much correct, and I did work for quite some time at RR. We did experimentation with engine modifications and single piece front fan. AL21 can very much be improved. It won't be perfect, no - it won't and it won't be anything as good as AL-31. But heck, the AL-21 is one hell of an engine. I have done quite a bit of technical modeling experimentation on
Khatchaturov R-35-300 and I am quite a fan if it. It can be modified with better blade timing, better compression management, and better fuel mixing. It can be modifed with a single piece front fan. It won't be difficult to add an electric fan (larger) in front of the engine driven by the generator of the engine. All of these are possible but need experimenting with and R&D to finish.
VIVAK is very much accurate (theoretically) with what can be done to AL-21 to improve it and enhance it.
Again, none of these are PERFECT - but Iran needs an engine with high thrust, it is not short of fuel, and range can be addressed with dormant air bases near the Persian Gulf which are not used at the moment. So Iran can certainly make this work for it. Enough to make the West crap in its pants.
Low quality of alloy!
Another Scoop! I don't know where you did find such information.
Wait a minute! Ukraine is not USSR first! Secundo in a previous comment I said that the Iranian AN-140's problems were a result of sabotages by your enemies. Israel and the US did all their possible to jam the engines provided by Ukraine to Iran. Moreover, Ukraine nowadays is not more than a failed country. Ukraine does have none future. Everything there is a matter of corruption. In Ukrain It is a mafia that leads this so-called country. Everything fails. All Ukraine's hardware is a failure, it is no use to mention it.
Another problem that has nothing to see with the RD-33. India is famous around the world for its high level of fighter accidents. They lost several dozens of aircraft, what would be the explanation? Hard training? Pilots, that use their aircraft near the limit? Or near the limits of Pilots? Organizations? No one knows.
Just for information: Algeria uses several dozens Mig-29 -more than 100, if not around 200- they are more than satisfied. Egypt uses Mig-29 -they have now 50, and wants other dozens in the goals to replace their F-16's fleet-. beside others like Vietnam, Myanmar, Serbia, Yemen. Notice these last countries are not known to be in the northern hemisphere.
No use to mention North Korea with more than 100 Mig-29.
AN140 accidents --- without a shadow of a doubt --- was sabotage. I can not discuss the evidence here. Enemies of Iran and Iranian people are relentless and well funded and they are here (no doubt). An140 accidents were SABOTAGE. Alloy mixing sabotage at source, leading to melting.
Iranian people have to wake up and realize ... ISRAEL & U.S. are the ENEMIES OF IRANIAN PEOPLE - not IRANIAN GOVERNMENT.
Don't fall for the bull$#!t of the West. They murdered 140m native Americans and Hollywood made movies for 80 years with John Wayne and Clint Eastwood, projecting native Americans as CRAZY VIOLENT MURDERERS. They were defending their land, there rights, the White Europeans were the murderers, not the other way around.
He is right because of cold weather of Russia they use low quality alloy in their engines ... Ukrainian Antonov 140 had same problem in Iran , it had crash because of its engine ... Antonov140 and Mig 29 both have short range and where designed for Ukraine and Russia ... Mig 29 had many crashes in India even after using new engines
Sorry with all RESPECT, cold weather blah blah is nonsense. Engines don't work like that. Cold weather does not affect the engine in a significant way. RR has been running tests for half a century and none point to this - in a significant way. There is also a bunch other factors, which I am not going to go through them here.