主题：【原创】再谈四代 -- 晨枫

You are welcome. Chengdu J-20 is more than interesting. It is a game changer. That is a big topic and let's save it for later.

How J-20 compares to F-22 is a question that is on many people's mind. Unfortunately, at this point, other than a few pictures, there has been no technical data released, including geometry (wing span, length, height, wing area, etc.), performance (range, speed, turning rate, etc.), weight/load (empty weight, loaded take off weight, max take off weight, internal weapons load, underwing carrying capability, internal fuel capacity, etc.) and electronics (AESA, IRST, sensor fusion, EW, etc.). All guesses will be just that, guesses. Popularly it is believed that its performance is comparable to F-22 overall but I have no way of confirming or disputing that. However, I am reasonably confident that it should outperform F-35, which is actually inferior to the teen series in terms of speed, agility, etc. because of its dismal thrust to weight ratio and wing load. Believe it or not, it is not that hard to outfly an F-35.

J-20 uses outward canted and all moving twin tails. The purpose of that large amount of deflection is not to enhance maneuverability. However, with that high degree of deflection, it doubles as air brake, together with coordinated moves of flaps and canards, to make sure it slows down level and straight.

Besides that, all moving tails can be more compact, using active control instead of passive stabilization like wind cock. If you look at F-22't tails, you can easily tell the fixed part from the moving rudder at the back edge. The fixed part is that wind cock, resulting from the classic laterally stable design. J-20's smaller V tail is laterally "reduced stability" design, saving on weight and RCS, but more demanding on flight control.

You mentioned that J-20 is similar to F-22. I imagine you refer to the side profile. However, aerodynamics is more determined by "birds eye view" than side profile. J-20 and F-22 are decidedly different from that angle. Aerodynamically, these two are as different as Corvette and Porsche 911, or F-16 and Eurofighter Typhoon.

Hope I answered your questions and nice talking to you.