Chinese Engine Development

Deino

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Honestly ... I will ignore everything else You posted in regard to honor, my own pride, arrogance to admit mistakes, flaws in my logic or a possible “Deino-fan-club” here.

IMO it’s up to others to decide, who’s honorable and who’s not, who is pride or who is arrogant …

But o.k. … let us argue and discuss at Your “theory”:

You are wrong again on this one yet again. The PW F100 did powered an F15.

So you see your argument is flawed as F16 and F-15 were indeed powered both Pratt and Whitney F100-100 as well as GE F110-GE-100 series engine at one time of their service.

I think here it’s You, who’s wrong.

I never said the F-15 did not use the F100. I said exactly the same type of version. If You don’t know, the F-15 uses originally the F100-PW-100, while the F-16 the F100-PW-200. As such – if You would have read correctly – my argument was correct: the F-15 never used a F100 that was formerly used in a F-16 and vice versa and the same – so my assumption – goes for the J-10 with the FN and the Flanker with the older F; both engines are IMO not interchangeable.

That was only later achieved with the F100-PW-220 from 1986 on and – here the USAF was quite special for aircraft using the “common engine bay” configuration (F-16 Block 30/32), which are also capable to use the F110-GE. And this exactly brings us to the next point:


Back to the differing point of our debate:

I have opined that the first engine for the J-10 fighter was in fact a modified AL31F with its gearbox relocated by the Chinese Aviation engineers. For the production model China submitted their requirement and specification based on this modification to Russian Manufacturer Salyut.

Then give us any hint or at least any source for this ! So far it is only a theory…
You openly disagree calling mine a theory without any credible source and opined since this is the first time, you ever heard of it, it never happened and even claimed that AL31FN is a completely different engine from AL31F. Next question: Do you truly understand how Chinese minds tick?

AL31F and AL31FN are not theory but REAL and FINISHED product.

This is where my disappointment with you begins. Your lack of understanding on the subject of powerplant for the J10 and J11, the AL31F and its different variants although you do pride yourself as an expert in this subject citing case of articles you posted.

How on earth and what has the “way Chinese minds ticks” to do with solid engineering ?

Maybe You could tell us what’s Your technical or engineering background? Are You involved in engine manufacturing and maintenance?

I admit, I’m not an engineer, but all I asked tell me it is possible but surely for an operational fleet especially if stocks of engines are available not feasible. So again why should they do this ? Only since Chinese engineers tick differently?

As such You are surely correct, Chinese mind tick different … but they are not stupid.

Again: I don’t say it is impossible to convert these engines, but given the huge purchases that are well documented – in fact all but the first one – it is ridiculous to think the PLAAF would rework Fs to FN only for fun… otherwise what engine would then the J-11As are using ? Surely not FNs back-converted to Fs ?? And so far we have not seen any operational J-11A converted to a WS-10A.

Sorry to say so, but there are so many logical flaws in Your theory, a theory that in fact is not impossible, but that does not make any sense … not the slightest bit.

You also opined that different made engines are not switchable in a single aircraft and I prove to you wrong citing the two different WS10A and AL31FN that powered J10 or WS10A and AL31F.

Sorry, but where did You prove me wrong ?? You posted again images of an AL-31F and an FN but nothing more and again I think You did not read correctly: Just look at the South African Mirage F1 refitted with the Russian RD-33-version. It was a heavy modified single airframe … and not an operational bird and the same is for most re-engine programs. Building test-specimen or prototypes is always possible, but swapping different engines on different aircraft types is simply a different story.

You are however correct in one point – not sure if You even noticed – and I think it is indeed an issue, where I need to correct my so far established meaning: we just got an image of the rarely seen J-10 prototype 1004 fitted with an WS-10B … that’s the first proof that also the J-10A can use the Taihang. BUT … and here a huge but: we don’t know how heavily it was rebuild or modified to use this engine. Was it ever rebuild with an AL-31FN or later simply retired as all other 100x-series prototypes ? I don’t know, but the fact alone that so far no operational J-10A used a WS-10B or any operational J-11A the WS-10A tells me that is is either not that easy to interchange engines or it is not done due to other reasons …

Russia did offer Iran to re-engine the Grumman F14 with their stock AL31F turbofan.

That’s wrong, plain wrong to say so … and maybe You got this again from Wiki and it is as plain wrong as these reports that Iran sold one Tomcat to Russia … but anyway, this is not the point here.

By the way … quoting Wiki is not the best way to earn a reputation as a trusted poster and here just one hint to Huitong – since you mentioned him - … I perfectly aware who he is and just to correct You: it’s indeed not the number of posts anyone here, but the quality of content and especially in this regard he’s surely one of the most respected members here even if he has only a low number of post … not sure if this can count on You too so far?

Deino
 
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Deino

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Due to being much more engine related that a specific J-11-issue I moved all posts concerning the discussion on AL-31F and FN to the engine tread: please continue here ... and there are indeed a few new facts !

I went on and asked a few chaps at other forums ... and here's what they say:

Jō Asakura said:
The development contract for the AL-31FN was signed between Chengdu and NPO Saturn on 31st March 1992.

Later that year 10 serial AL-31F engines were delivered to MMPP Salyut's facility to be modified to AL-31FN standard, 9 of these subsequently went to Chengdu's facilities.

So, yes the AL-31F can be modified to FN standard, but would it be economically viable? Especially given that the latest AL-31FN Series 3 for the J-10 will be even further removed from the baseline '31F.

Here the joint Russo-Chinese design staff are pictured in front of the first AL-31FN:
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martinez said:
Deino, when knowing what is the gear-box used for in the aircraft, e.g. creating mechanical and electrical output to drive many on board specific systems like hydraulic, fuel, flight and electrical systems, ....etc, in the meaning that locating gearbox on the bottom side of the Al-31 engine was surely not only one custom feature and a difference between the F vs FN. Or is it known that the J-10 on board systems are identical to the Flanker? Not telling the conversion is impossible, but doubt that Chinese are so dumb to do it on their own, not to mention on some heavy maintenance plant level. I know that you think of them very highly, but recently I;ve heard reports that their helicopter engineers were not even able to replace old russian APU`s to a new western ones and do it alone. Instead they have hired foreigners to do the engineering design and installation for them. So, from my POW it is a total nonsense.

regards
M

and finally one post concerning Your own post:

Micron said:
Since no other Russian warplane is designed for the AL31FN, it is ludicrous to think that Russia will specially designed another engine just for China J-10A indigenous fighter...

Vnomad;2306843 said:
I suggest you ask your friend which Russian warplane is powered by the RD-93. Unless he thinks the RD-33 was modified without Russian involvement.



As such it is indeed correct - and so I owe You an apology and thank for this NEWS ! - , that technically spoken an AL-31F can be rebuild into an AL-31F as - and here I have to correct You statement from Wiki - demonstrated with the very first AL-31FN assembled in the early 1990s and not in 2002:

J-10 - first AL-31FN hand over - early 1990s.jpg


But in practice, in operational use it is not done ...

All the best,
Deino
 

Quickie

Colonel
I went on and asked a few chaps at other forums ... and here's what they say:

I hope that by asking the question in that forum, it didn't give the impression the members in general in this website is making the claim instead of just one poster.

I'm asking because of the bigoted and disparaging reply by Martinez, to which the brief answer would be: There are tens of turbofan engines in research and development in China and he's implying engineers there can't even modify a jet engine gearbox position?

Again, it's not a question of the ability to do the modification but rather a question of practicability since it's more efficient to ask the manufacturer to do the modification on their own product rather than to do it yourself , something which the manufacturer wouldn't have consented to in the first place.
 
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SamuraiBlue

Captain
The photo evidence is right in front of you.

Sorry to jump in but a single picture without any reference of size cannot be used as evidence that it will fit into a XXXX.
I really do not know what you people are arguing about but reading the past log then shown a picture saying this is evidence just doesn't sit well with me.
 

Hyperwarp

Captain
I hope that by asking the question in that forum, it didn't give the impression the members in general in this website is making the claim instead of just one poster.

I'm asking because of the bigoted and disparaging reply by Martinez, to which the brief answer would be: There are tens of turbofan engines in research and development in China and he's implying engineers there can't even modify a jet engine gearbox position?

Again, it's not a question of the ability to do the modification but rather a question of practicability since it's more efficient to ask the manufacturer to do the modification on their own product rather than to do it yourself , something which the manufacturer wouldn't have consented to in the first place.

Thats just martinez. He is like that in general and does not target any specific country. He is very experienced and knowledgeable probably one of the most knowledgeable at Keypubs, but that just how he posts. The guy can be very rude, sarcastic, etc. Its probably his personality.
 

Hendrik_2000

Lieutenant General
Thats just martinez. He is like that in general and does not target any specific country. He is very experienced and knowledgeable probably one of the most knowledgeable at Keypubs, but that just how he posts. The guy can be very rude, sarcastic, etc. Its probably his personality.

Some one with no knowledge of Chinese has no clue whatsoever what he is talking . Knowing keypub they are bunch of yahoo. They are bunch of fanboy for Indian defense industry. Go check their prediction nothing come close to reality.Their comment on Chinese military development are based on rumor and hearsay. I stop visiting their website eon ago!
 

Hyperwarp

Captain
Some one with no knowledge of Chinese has no clue whatsoever what he is talking . Knowing keypub they are bunch of yahoo. They are bunch of fanboy for Indian defense industry. Go check their prediction nothing come close to reality.Their comment on Chinese military development are based on rumor and hearsay. I stop visiting their website eon ago!

There are fanboys of all nations at keypubs. Indian threads don't have much these days. There was a time when there were some majorly loud fanboys when it came to Indian military but that has died down. Reality sinks in after all. These days the hot-spots would be the F-35 threads :D. Regarding Martinez, he was the Chief Maintenance Engineer at the Slovak Air Force and had worked for decades including the Czechoslovakian Air Force. He has immense experience and now works in the defense industry itself and has international contacts/relations. His aeronautical engineering knowledge is pretty impressive. I've seen him tear US & Russian fanboys into pieces. How much contacts he has with Chinese companies I don't know, but I wouldn't put a pass on him, yet.

Ok, my apologies for going off-topic and this will be my last post on this matter.
 

Deino

Lieutenant General
Staff member
Super Moderator
Registered Member
Micron's thoughts are very interesting, it seems he knows what he is talking about ..... I am sure he will be a great contributor in this forum


Yes indeed if he calms down a bit and is also able to correct his own comments. His statement regarding the F100 or the Iranian Tomcat is plain wrong, Wiki as a source is also ??? and overall the world is not black & white only ??

Another argument against this rebuilding of AL-31F to FN are their slightly different dimensions:

Main characteristics for the F (via
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):


length 4.945 m
length nozzle 1.603m
inlet diameter 0.905 m
dry weight 1,488 kg
air flow 112 kg/s
the minimum specific fuel consumption 0.67 kg/kgh

Main characteristics for the FN (via
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):


length 5.002 m
length nozzle ? (IMO the same)
inlet diameter 0.905 m
dry weight 1,538 kg
air flow 112 kg/s
the minimum specific fuel consumption 0.705 kg/kgh


So, that makes the FN both larger and heavier ...
 
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