Structural advantages. The forward swept wing structure can ensure a better connection between the wing and the fuselage and reasonably distribute the pressure between the wing and the front landing wing. These advantages are difficult or impossible to realize by other methods, which greatly improve the aerodynamic performance of the aircraft during maneuvering, especially at low speed. In addition, the structural design of the forward swept wing can also increase the internal volume of the aircraft, create conditions for setting up the internal weapon cabin, and greatly improve the stealth performance of the aircraft. ?

Maneuvering advantage. Forward-swept wing technology can make the aircraft have very good aerodynamic performance in subsonic flight, thus greatly improving its maneuverability in elevation. If the forward-swept wing layout is combined with the thrust vector control system, it will have more advantages in air combat and its maneuverability in close air combat will be doubled. ?

Take-off and landing advantage. Compared with the swept-wing aircraft with the same wing area, the forward swept-wing aircraft has higher lift and 30% higher payload, thus reducing the wing size, head-on resistance and structural weight of the aircraft. Reduce the aircraft trim resistance and increase the subsonic range of the aircraft; Improve the low-speed maneuverability of aircraft and shorten the take-off and landing distance. According to the calculation of American experts, if the F- 16 fighter adopts forward-swept wing structure, it can increase the transition angular velocity of 14%, increase the combat radius by 34% and shorten the take-off and landing distance by 35%. ?

Controllable advantage. The forward-swept wing structure can improve the controllability of the aircraft in low-speed flight, improve the aerodynamic efficiency in all flight States, reduce the stall speed, and ensure that the aircraft is not easy to enter the spiral, thus greatly improving the safety and reliability of the aircraft.

Of course, the forward swept wing is not perfect. For example, it has complex technology, high requirements for related technologies, high strength of pneumatic components, and the flutter problem of wing tip can not be completely solved so far. So at present, few fighters adopt this layout.

Practicality is still not high. Take the old man's Su 47 as an example and build a verification machine!