SDF Aerospace and Aerodynamics Corner

Engineer said:

Engines used on J-10 and J-11 aren't interchangeable. At least we know Al-31F can't be used on J-10 and Al-31FN can't be used on J-11.

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latenlazy said:

It's a simple gearbox position change though, which I can't imagine being very difficult to address in the process of assembly.

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paintgun said:

not just swapping position of gearbox, you need to redesign or reroute some auxiliary parts, pipings, pumps, wirings, valves

tinkering with such things might be left best to the original manufacturer

the gearbox position is the sole reason for the AL-31FN existence

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latenlazy said:

We'll have to disagree on that one. I see no reason why they couldn't stick the WS-10 into the J-10's fuselage, since it's meant to be interchangeable with the J-11. One potential reason could be based on planning and logistics, but other than that a supply shortage renders that an unnecessary conclusion.

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Engineer said:

A forth reason is that Al-31FN has low service life that each J-10 requires nearly two engines, with one engine use for spares and acting as replacement. Ignoring the recent purchase, we see approximately 2:1 ratio of engines to planes, supporting this forth reason.


Wrong. We have seen J-11B and one of the J-10Bs using WS-10A, thus WS-10A is ready. That's a fact. It's the J-10B which is not ready, which is why you still haven't seen WS-10A in service on the J-10s.


There is no contradiction. J-10A was designed to use Al-31 more than ten years ago because at that time, WS-10A was not available. Ten years later, they redesign the J-10 to take on WS-10A, and the J-10B is born. WS-10A wasn't ready ten years ago does not mean WS-10A isn't ready now. In fact, WS-10A is already being used on aircraft that are in service with PLAAF, debunking your theory that WS-10A is not ready.


That is a delusion, not a conclusion. Your theory would work if and only if none of the plane in service with PLAAF uses WS-10A engines. We know your theory is nothing but a delusion because there are plenty of J-11Bs using WS-10A. In fact, WS-10A is so ready that both CAC and SAC use the engine on J-10B and J-15 prototypes. We have plenty of photographic evidences support this.

WS-10A will not go into the J-10A, and we have no indication that this is possible because we never see photographic evidence of J-10A retrofitted with WS-10A. We only see WS-10A fitted into the J-10B. So, many of those newly purchased Al-31FN will definitely go into old aircraft as replacement. Some of those engines will be used to build new J-10A so J-10s can be produced to replace old fighters. However, J-10A uses Al-31FN does not support the idea that Al-31FN is more reliable than WS-10A, nor does it support your delusion that WS-10A is not ready.

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MiG-29 said:

all　what you say is your opinion to justify the holes you can not fill in why China still buys Al-31、you might be right if time shows prodution and operational service of aircraft using WS-10, but unless you see in 2-3 years period of time aircraft in operational service using WS-10 all what you say is your opinion , but of course i have my opinion only time will tell who is right asnd who is wrong

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MiG-29 said:

In my personal opinion all of thisa is pure especulation, only time will tell if the Al-31 remains the main engine of J-10s or the WS-10 replaces it in next batches, but at least the latest J-10 to enter operational service last week have Al-31[video=youtube;-frG_Z5WuT8]http://www.youtube.com/watch?v=-frG_Z5WuT8&feature=player_embedded[/video]

i say in my opinion, not that it is true or a fact, i think Al-31 will remain the main engine, but who knows only time will say

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Engineer said:

I like how you are projecting your attitude on to me, but unlike you, I don't pull things out of my ass to justify holes that you cannot fill. You are unable to explain why 500 Al-31s are brought when there are only about 240 J-10s. You are unable to explain why we see photographic evidences WS-10A in service with PLAAF despite your claim that WS-10A is not ready.

WS-10A is in operational service on J-11B, and reliable enough to be used on prototypes of new aircraft. This is a fact, not an opinion.

You can ignore evidences, and repeat your lies a thousand time, but your delusion isn't going to turn into truth.

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