I google translated this from a Chinese article analyzing the J-10's performance and aerodynamics. It appears to be an interview. Aside from the robot generated grammar, you can dig pieces from the text that gives you an idea.
March 21, 2007 : 07 A 30 F-10 fighters used by the aviation knowledge canard configuration. This is the first time that China successfully developed a Chinese fighter. The family of fighters in the world, some of the more advanced fighters used a similar layout, Sweden's Saab a 37 "Thunder", the JAS 39, the French "Mirage" III NG, "Mirage" 4000. "Gust of Wind," and Israel's "young lion" C2 "lion" Russia's MiG 1.44 EF2000 development of the cooperation between the four countries in Western Europe and "Typhoon." With the in-depth development of aviation technology, a new program emerging duck fighters, and among the ranks of advanced fighters.
Well, what the fighters duck layout features its aerodynamic characteristics and how?
After the end-use of high speed and low speed, and no good end of the general layout of the high-speed aircraft pneumatic Due to various reasons, its slow performance is often ineffective. And duck layout of the fighters were able to meet the high velocity. Performance requirements. This layout will be good for high-speed aircraft to take care of the slender body shape and aircraft landings on the short-range or high-level allocation coefficient. This is because : on the one hand, slender ducks layout in the transition from subsonic to supersonic. The focus of the movement of the end-to stability after more than a small increment, which is beneficial for high speed flight. Other hand, in high angle of attack, or approaching flight, it can produce the end-and no later than the end of a much higher trim lift aircraft. This shows that it is also suitable for low-speed flight. Balancing lift plans high-end after the first set began, and duck-tailed aircraft longitudinal trim the way maps. Unsteady flying level and in the air do, and lift its gravity, thrust and resistance is equal, the whole plane is balanced torque. Offered peace force F-10A for a duck with the early F-layout program in China although there were a concept embodied 9, But the many technical problems involved in the F-1 tester access is the ultimate solution Liu Ying caption perfect pitch. Tail-end and after the aircraft without the need to pay a certain price for the lift. During the flight, the lift-wing aircraft or torque Mzo Y and the entire focus of the aircraft to generate a bow torque. To balance this moment, there should be no partial aircraft movements tail fins, tail after the aircraft to tilt on the elevator. Lift to trim to produce a negative result dropped the whole plane lift. Of course, when the level of attack is not the end of the load, it is a small price to pay to the lift. However, when the aircraft to fly at high angles of attack, and to take measures to increase or (up wing) on the situation worsened. Would have risen greatly because of the additional torque bow. To trim those additional torque, the horizontal tail edge too great to be on the point, it will have risen remarkably dropped arrived. If a wing or a high-growth approach. Balancing the sometimes very difficult, but bear in the horizontal tail lift height of the measures taken.
This is no shortage of examples. The F-4 aircraft in the United States after taking an edge flap boundary layer control technology, bow torque increase substantially. The results they have already allocated nearly stall in the tail, but the end of the peace process, upswept front. The airfoil-bending will become. Japan's PS-1 seaplane was on the tail surfaces to increase the negative inflatable lift. After the end layout like this, no tail-plane balancing the rising power is even more difficult. In contrast, duck-tailed and no later than the end of the layout-layout advantage : Pitching torque from its rise before the aircraft is the focus of UAVs (canard). This is really killing two birds with one stone : it provides a balancing torque, increased lift.
Then why do people seldom used before duck layout?
This is because the ducks conventional aircraft has three drawbacks : (1) There is a strong wing to wing before the next wash, lower wing lift. Despite the lifting of the front wings that are partly offset the loss of lift, but not necessarily lift the total allocation usually much higher than the after-tail.
(2) Hollywood-style layout not solve problems of distribution. Under normal circumstances. Canard load than the tail, the tail often as 3-4 times. Because if canard put in front plane followed focus forward and center forward adjustments are required. This canard from the center of gravity of the past, Arm short, it's balancing capability is limited. In addition to the main wings on the front wings are washing, in the first easy-wing stall angle of attack before. This landing and take-off maneuver at high angles of attack is negative. Swede end of the last century until the 1960s, successfully developed a 37 Saab aircraft, These shortcomings will be overcome to a certain extent. As M-2 level for the aircraft, Saab 37 not use a complex risen measures to enable the taking off and landing on short distances N400 m, meet the requirements in a short distance and landings. This success has attracted widespread international attention. Saab is one of 37 adopted a close-coupled canard layout, the use of the favorable after-wing detached vortex interference between a rising power.
(3) The vortex from the surface of the main wing formation, development, and the breakdown of the aircraft lift and horizontal drift of the torque characteristics of a great impact makes nonlinear longitudinal torque curve is very serious, and lead to a deterioration of aircraft steering stability. In order to solve this problem, the conventional canard airplane had increased the stability of the aircraft, to seek more straight vertical torque curve. As a result, the aircraft's increased resistance to trim, trim capacity of the front wings, aircraft taking off and landing of the maneuverability and performance deterioration. One of the solutions is the use of fly-by-wire system, relaxed static stability.