J-20 5th Gen Fighter Thread VI
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Hmmm? This would be a new milestone, I'd be interested in the source.
Quite a development if true.
@huitong
If we get the cartoons then this is pretty much a done deal! Optimistically we can see production ready WS-15s in ithe 2023-2025 timeframe.
manqiangrexue
Brigadier
So if the sawtooth nozzle is already in production, it could refer to the nozzle seen on the WS-10 engines. Correct me if that's wrong, but I think that means that externally, an aircraft fitted with WS-15 and that nozzle could be indistinguishable from a WS-10 with the saw-tooth nozzle... except possibly when turned on and staring into the rear of the engines...Hmmm? This would be a new milestone, I'd be interested in the source.
Quite a development if true.
@huitong
Could that could mean that all those cartoons we saw about J-10/J-20 discussing bigger "chrysanthemums" were about WS-15 instead of WS-10?
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That's not true. Rumor has it that the WS-15 has a shorter nozzle and has a different petal count than the WS-10. WS-15 nozzles will also have TVC, which is not a given when it comes to WS-10.
No, there's no reason for us to believe that the WS-10 and WS-15 have the same nozzle. Yes, the WS-10 for J-20 (whatever its name is; WS-10C or what not) has serrations, but that doesn't mean it is the exact same as WS-15. There are many round engine nozzles with serrations that are still different in design -- F135, izd 30, WS-10C etc are all different from each other because they are all different engines.
As a different engine itself, there is no reason for us to think the WS-15 nozzle would be indistinguishable from WS-10C's nozzle, including for physical dimensions such as petals, nozzle length, etc.
manqiangrexue
Brigadier
Is it normal, then, for engine nozzles to have gone into production years before the engine itself goes into production? I would think that they would go into production at least at similar times because a nozzle that went into production in 2018 or 2019 and is just sitting there for 4-5 years waiting to be mounted could be sub-optimal compared to the design/materials available to make them with by the time the engine is ready for production. I think it'd be pointless to produce and store them so far ahead of time, unless of course, they are a design that is already being used on other engines...
What do you mean?
We have no evidence that WS-15's nozzles have entered production or are at a stage of development that is ahead of the rest of the engine.
Edit, I see what you mean. You've interpreted the end part of the prior sentence as if it was relevant to the second sentence.
Ignore the prior sentence because it is irrelevant and it is just part of the screenshot. It is an easy matter of just reading the full entry, which states:
"A recent rumor (July 2019) suggested that J-20A powered by the indigenous WS-10C turbofan with a serrated (sawtooth) nozzle design has been in production. The latest rumor (September 2019) claimed that J-20 is being tested with the newly integrated WS-15 turbofan engine."
The two sentences are talking about completely different things. The first sentence is talking about J-20A in production with WS-10C/whatever it's called and how WS-10C has serrated nozzles. The second sentence is an entirely different rumour from just the last day or so that talks about WS-15.
Ignore the first sentence, it has no bearing on the second.
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I think the point - and IMO the misunderstanding - is based on the fact that these are two sentences. The first is related to the serrated nozzle, which is related to the WS-10C (or whatever) ... then there is a "." and the new sentence starts with the rumour concerning the WS-15 being tested. IMO it is clear that both are not related to each other.
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