Its your first attempt to produce F-22 class engine and you're still struggling for quality problem with your WS-10, you have no vast experience to build descent high performance engine from scratch your first attempt is WS-10, second WS-13 which is still development phase, third WS-15, so when you predict that WS-15 will be fit on J-20 @LKJ86
Why would flight testing be before 2023 ... there have been consistent developments indicating a flight testing of around 2019 to 2020
What quality problems are you talking about exactly? The latest WS-10 variants have already surpassed the AL-31F in reliability and MTBF. Also keep in mind Chinese metallurgy has improved very significantly over the past few years. And you have to remember the WS-10 has many of its problems due to the fact it was based on a civilian engine core ... the WS-15 is a completely clean sheet design. WS-13 is currently much lower priority than either WS-10 or WS-15.Its your first attempt to produce F-22 class engine and you're still struggling for quality problem with your WS-10, you have no vast experience to build descent high performance engine from scratch your first attempt is WS-10, second WS-13 which is still development phase, third WS-15, so when you predict that WS-15 will be fit on J-20 @LKJ86
Its your first attempt to produce F-22 class engine and you're still struggling for quality problem with your WS-10, you have no vast experience to build descent high performance engine from scratch your first attempt is WS-10, second WS-13 which is still development phase, third WS-15, so when you predict that WS-15 will be fit on J-20 @Figaro
no vast experience to build descent high performance engine from scratch in the class of F-22's engine F-119, so its safe to assume that WS-15 takes little more time to be matured because this is their first attempt to develop F-119 class engine @Figaro
Protip: Writing in caps and using "descent" instead of "decent" doesn't make your "point" any more correct, it just makes you look like an idiot. Once upon a time the US also had no vast experience to build descent [sic] high performance engine from scratch until it did. What evidence do you have that China doesn't have the requisite expertise to put together a prototype ready for testing in 2019-2020, if not sooner? Especially when a senior engineer has publicly stated that IOC will be achieved within 3 to 5 years?Its your first attempt to produce F-22 class engine and you're still struggling for quality problem with your WS-10, you have no vast experience to build descent high performance engine from scratch your first attempt is WS-10, second WS-13 which is still development phase, third WS-15, so when you predict that WS-15 will be fit on J-20 @Figaro
no vast experience to build descent high performance engine from scratch in the class of F-22's engine F-119, so its safe to assume that WS-15 takes little more time to be matured because this is their first attempt to develop F-119 class engine @Figaro
When its claiming that IOC will achieved in 2019-2020 @ZeEa5KPul
if IOC achieved in lets say 2019 that its doesn't means that it will fit directly into J-20 but first ground test and air testing with IL-76 test-bed which takes 3 -4 year to complete @ZeEa5KPul 
Read what I wrote more carefully. I didn't claim IOC would be in 2019-2020, I claimed flight tests on a J-20 would occur during this time. IOC (more accurately, design certification) within 3-5 years means IOC in 2021-2023. My source for that is this:When its claiming that IOC will achieved in 2019-2020 @ZeEa5KPul
I am thinking same first ground test will starts then air testing starts which takes 3-4 year to complete this means WS-15 will be ready in 2021-2023 time frame @ZeEa5KPul
1. WS-10 and WS-15 are large thrust turbofan engines, while WS-13 and WS-19 are middle thrust turbofan engines.Its your first attempt to produce F-22 class engine and you're still struggling for quality problem with your WS-10, you have no vast experience to build descent high performance engine from scratch your first attempt is WS-10, second WS-13 which is still development phase, third WS-15, so when you predict that WS-15 will be fit on J-20 @LKJ86
as you says it will take time to be matured flight tests soon in only test-bed that's what is i'm talking about but other on this forum don't agree on this they are expecting that WS-15 will be fitted on J-20 within a year or two @LKJ86 bro
On Zhuhai Airshow-2014, FC-31 V1 had one WS-13 already.as you says it will take time to be matured flight tests soon in only test-bed that's what is i'm talking about but other on this forum don't agree on this they are expecting that WS-15 will be fitted on J-20 within a year or two @LKJ86 bro
Very likely.
That's you assumption or you have a reliable backup for your claim @LKJ86
