| 1. Why does this aircraft have the large deflection/high rate flight control surfaces in all three axes, as demonstrated during the flight control checks before aircraft taxi, that also add considerable complexity and weight to the design, unless these are to be used in flight?
2. What do such large deflection/high rate flight control surfaces say about the stability and handling as well as flying qualities/characteristics of this aircraft?
3. Why does the J-20 have such a large speed brake when the quite powerful, fully articulated canted fins could be used for providing longitudinal deceleration in flight, as is the case with the T-50 PAK-FA, the F-22A, the Su-35S and the JSF, and the J-20 also employs brake chutes for arresting and minimising the landing rollout distance?
4. Why are those large, downwards opening MLG doors so prominent in the directional axis; so fast in their actuation; and, as has been observed, are fully deployed during some take offs while closed during other take off iterations?
Then there is the question as to why the JSF aircraft, so far, have yet to demonstrate the kind of manoeuvres at low level the J20 can be seen doing in the first of these videos?
| 
第一条俺以前问过关于鸭翼 - highsierra 06/07/12 (465)
降落当刹车用时，倒是可以转90度 /无内容 - laker_fan 06/08/12 (121)
不用90度，60度以上造成向下压效果也很好。 /无内容 - 海括 06/08/12 (66)