1 - AL-31 (especially F-M1/2 and 117 series) has much more efficient design (which leads to greater specific thrust, fuel efficiency and controllability in harsh and difficult running modes such as high AOA, boundary flow sucked into the intake and others, in which RD-33 become very difficult controllable).
And of course RD-33 lacks modern design features like FADEC, BLISK compressor wheels, 2100K+ materials and several others which make AL-31 outstanding. AL-31 has constantly been modernised and overhauled from version to version while RD-33 has left in the early 80-s by its tech level and technical data. Alsough AL-31 allows a fighters to have greater combat ranges due to greater fuel efficiency, while RD-33 powered fighters have 250 km intercept radius with one supersonic leap on the route.
And another one "feature" of AL-31 which RD-33 lack: it can be a powerplant for heavy fighters.
Apple and orange. They belong to two different class of engines.
2 - Yeah, RR engines are leaps, but allof them are in the past. Only Trent has left on the level, but it is not a fighter engine.
As for Spey...
@ice berg, are you a real moroon, or just kidding me? Spey was designed in 1955 and first flown in 1964 as civillian engine. The only countries where Spey has left in the air are Brasilia/Italia with AMX (civillian non-afterburned engine) and China which gather foreign old leaps being unable to make its own ones.
You are the moron here. China received ToT from UK and producing their version of Speys.
You should more read but less write to avoid so visible self-crapping mistakes like the following:
But instead of reading at least Wiki:
like this (but Janes is much better) you have shown yourself as nervous schoolboy which argues with diplomed engineer adult.
There are many types of engineer, son.
Yes, Spey is not Russian engine. So, if you'll spread your narrow eyes wider and reread my original post, you will see that I have said that it is NOT Russian and is not Russias property or problem. You can sell this obsoletion to anybody who want to buy it
Amazing logics again, if it is not Russian engines. Why you bring it up in the first place?
I have all the logic necessary. If China will resell those engines, it will not share aftermarket profits with Russia. This is bad move. Also China will sell engines (and fighters which they power) to the countries, which are in the Russias black list. Look at the political situation in the Middle East and Africa and you will see all the reasons (if you want to, but you don't, you want just puke, not think).
I already gave you a list of aircrafts exported. Guess you are the russian puke kid here.
Read a quote above. BTW, China want to sell fighters and engines for them independently from the Russian political interests. China constantly tries to copy-paste engine technologies illegally. Those reasons are enough to sell advanced engines to China with restriction for internal use only.
Copy paste engine technologies? ROFl and you claimed you are an engineer? You can not copy paste engines, that is the whole point, son. Desgin, manufacturing, metallurgy, supporting facilities. You can not copy those. Frankly if you really are an engineer, I would be really embarassed.
Post #85 proves nothing except you have complete mess in your head, kid.
K-8 - Ukrainian AI-25TL (aged non-Russian non-fighter engine)
Hongdu L-15 - Ukrainian AI-222-25 (not Russian, aging non-fighter engine)
Jf-17 - Export approved obsoleted RD-93
Where are AL-31 or the other 12-tonns class engine powered plane among them?
Proves you are the brainless zombie here. It clearly shows you can export an aircraft regardless of where your engines are coming from. You are the one who claim it cant be done.
Go read some real books, not Chinese fans forums before you start argue with adults.
And, BTW, we are talking about J-10 with AL-31FN, not about trainers or light fighters. So, read the discussion first.