serenity
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Simply cost. Putting TVC on J-10 will make it more expensive and harder to keep in operational readiness when the whole point of inexpensive single engine J-10 in PLAAF's structure is to use as lower tier fighter for most tasks and supporting fighter for even heavy threat tasks.
TVC itself is much heavier and sacrifices some thrust. Therefore is it worth it? That will only balance out extra agility and option for certain movements. So basically nothing gained in balance and only extra cost and maintenance nightmares. Even that for a TVC J-10 to PLAAF is not worth it and considered a demonstrator for study only.
They rumored about J-10D either with improved WS-10 engine or some WS-10 TVC engine or even some suggest WS-15 engine or stealthified J-10D. I do not think any of that is smart. Why develop a whole new J-10D that is stealthified. To commit all that money and engineering power and still carry weapons either outside or in stealth pods. When you can put that money into Dark Sword UCAV and twin seater J-20 combined.
As for WS-15 engine on J-10, as we now think, WS-15 may be TVC. Of course that also means you can easily make a non TVC WS-15 version and it'll be easier, more reliable, cheaper, and lighter with even more thrust. However initial production of an engine is not going to be enough for J-20s and J-10s. Depending on the cost of the WS-15, it'll maybe not even be worth the extra performance for J-10.
Any J-10 development will likely just be electronics and software upgrades. Maybe specific new tasks that require a totally new piece of equipment for example being part of observer network for directing sensor and shooter chains that J-10 currently is not a part of but PLAAF wants it to be for future weapons. Something like that. WS-15 upgrade to J-10 may not even be worth it if it is able to be integrated. Any better WS-10 of course would be used and it'll still be J-10C.
TVC itself is much heavier and sacrifices some thrust. Therefore is it worth it? That will only balance out extra agility and option for certain movements. So basically nothing gained in balance and only extra cost and maintenance nightmares. Even that for a TVC J-10 to PLAAF is not worth it and considered a demonstrator for study only.
They rumored about J-10D either with improved WS-10 engine or some WS-10 TVC engine or even some suggest WS-15 engine or stealthified J-10D. I do not think any of that is smart. Why develop a whole new J-10D that is stealthified. To commit all that money and engineering power and still carry weapons either outside or in stealth pods. When you can put that money into Dark Sword UCAV and twin seater J-20 combined.
As for WS-15 engine on J-10, as we now think, WS-15 may be TVC. Of course that also means you can easily make a non TVC WS-15 version and it'll be easier, more reliable, cheaper, and lighter with even more thrust. However initial production of an engine is not going to be enough for J-20s and J-10s. Depending on the cost of the WS-15, it'll maybe not even be worth the extra performance for J-10.
Any J-10 development will likely just be electronics and software upgrades. Maybe specific new tasks that require a totally new piece of equipment for example being part of observer network for directing sensor and shooter chains that J-10 currently is not a part of but PLAAF wants it to be for future weapons. Something like that. WS-15 upgrade to J-10 may not even be worth it if it is able to be integrated. Any better WS-10 of course would be used and it'll still be J-10C.