52051
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And he was talking about from 2018
2018+5= 2023 it might be testing on ground than in 2021 or 2023 will start testing on J-20
He is talking about be ready in 3-5 years, which means by 2021 to 2023 you will see full functioned WS-15 on J-20, which means flight test of this engine can be anytime from now.
Go checking the typical schedule/timeframe of engine development, and stop writing your thoughts.