Flying without a vertical stabilizer

[telnar1236]

as shown in the picture of the "j50" i think you should really try all moving wing tips or AMTs

I went a little bit down this rabbit hole after seeing the j50 wing tips and it turns out these have been a concept since the 90s but it seems that the Chinese are the only ones that use them on their tail less planes (that we know of)
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I'm pretty sure they just stall the outer most tip of the wing to cause a lot of drag for yaw control. the counteracting roll moment can probably be easily fixed with some aileron mixing

I'm still a bit unsure about passive yaw stability for these designs

Worth considering if I ever pick this project back up. Overall, though, I don't think they should be necessary if you use split elevons or have dedicated drag rudders and they might not be worth the added complexity. I suspect they probably are more to give better roll control at high angles of attack since I think I a similar system has even been tested on an FA-18 at one point.