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  1. Canard-delta airframes aren't new. The late 60s / early 70s brought us the SAAB Viggen, but it had a CoL behind it's CoM and therefore did not need FBW (fly by wire) technology to render it controllable. However, most current fighter aircraft are designed with CoL ahead of CoM (inherently unstable). They are completely dependent on FBW assistance - this includes tailed designs like the F-22 Raptor, as well as canards like the Eurofighter Typhoon - But what of the dark horse, China's J-20? It's hard to find actual information about this aircraft rather than just endless trash-talking and trolling on the internet - yes we know China makes a lot of cheap and substandard stuff. Yes we know they're new to this game and however it looks on paper it probably will not be as good of a weapons system as the Raptor in reality. What interests me is the airframe. I suspect this might not be a "relaxed stability" or "inherently unstable" design. Look at the canards in this takeoff video , they angle up to raise the nose ... and they appear to remain angled up after the aircraft rotates. They are having to maintain an up force to maintain the positive AoA. On an unstable design, the higher the AoA, the more the canards must angle downward, to suppress the nose's tendency to rise ever higher. Of course, it is somewhat complicated by the fact it also has elevons and thrust vectoring, we can't really see what these surfaces are doing from this low quality footage.
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