If someone told me I-30 will uncooled blades in HPT, I would still see it with doubt let alone 117 having it. If Russians have found out some exotic material to withstand 2300deg C, then I don't know. But I need to see a stronger evidence to take it as truth. To achieve the figures that Russians claim for 117 or for I-30, one does not need uncooled blades in HPT or 2300C TIT.
What strong evidence does one need , The 117 engine outclass the F-22 engine in T:W ratio and every other western engine lets say barring the F-135 but the F-135 is not designed to supercruise while the 117 has it , The only western engine I know of T:W ratio of 10:1 is the EJ200 . The only evidence one would get is from such interviews ...... the other is to search for Patents but if we dont understand crylic then search them is like needle in hay stack.
If you read the full interview he even mentioned that 117S engine of Su-35 was not an easy task to achieve 2 T more thrust keeping the weight and dimension same , the AL-31 F is what our MKI uses
Austin, increase of 2.5T thrust in AL31FP is not a big deal, per se. Lets not see it in isolation. Al31 is yesteryear's engine by any standard - full 3 generations behind engines like EJ200, F414-EE or F119 (2 for technology in terms of T:W and 1 for terrible life). Russians found it hard means nothing in terms of Physics of the problem. Others have solved it already. By that standard Kaveri must be the best engine in the world, because we Indians cannot make it however hard we try to make it, no..??
BTW F414-EE is also T:W 10 class.
See, 300 deg jump over F135 is no small thing. With that and uncooled blades (significant reduction in chargeable air), if they are still at T:W = 10.5 then they must have fckued up real bad on other components. Logically speaking its far more probable that Russians achieved the increased T:W over Al31 from application of advanced 3D Aerodynamics and better manufacturing processes like blisks and AM which are low hanging fruits, than CMC. It could be possible they made some magic TBC to eliminate cooling for conventional SCBs, but TBC has significant negative effect on structural life. Here they claim double life for this engine over that of AL31. I don't care how good or bad Russians are in metallurgy, arguments for this particular issue should stand on their own merits.
I don't say it impossible, I can think of two ways to get there - CMC or some magic TBC. I would be thrilled if the Russians actually have the breakthrough of uncooled HPT blades and 2300C TIT. Because it a big achievement technologically speaking. And IAF will probably get those engines for Su-30 upgrade and Initial batch of PAKFA (or a even better I-30), if we ever decide to buy it. But I need to see it to believe it, through some research paper or technical article giving little more specific details of what they are doing, or at least corroboration from multiple sources. I know it may not be possible to find verification easily, but I will remain sceptical until I see something.
Austin, you mentioned significant reduction in stages. Al31F or 117s have too many stages. So reduction is not surprizing. 3 LPC, 5-6 HPC, 1 HPT and 1LPT is what one should expect reasonably for any 5th gen engine (not fighter generation but engine's genration).
A question to brar_w. OT here, may can be taken to Engine thread. Whats the weight of F119..? The weight quoted on wiki ~1800kg, is that including the TVC in it..?? Looks higher to me than expected. PS: I saw you already talked about this one in one of the posts above.