主权项 |
1. A split winglet configured for attachment to a wing tip of an airplane, comprising:
an upper winglet extending from the wing tip above a chord plane of the wing, the upper winglet comprising an upper surface and a lower surface bounded by a leading edge and a trailing edge, the leading edge and the trailing edge comprising substantially linear sections which are swept toward an airstream direction and then converging to an upper winglet tip configuration comprising a curving of the leading edge and the trailing edge toward the airstream direction to substantially a point distal of the wing tip, the airstream direction being substantially parallel with the chord plane; and a ventral fin projecting from the lower surface of the upper winglet, the ventral fin comprising an upper surface and a lower surface bounded by a leading edge and a trailing edge extending below the chord plane, the leading edge and the trailing edge comprising substantially linear sections which are swept toward the airstream direction and then converge to a ventral fin tip configuration comprising a curving of the leading edge and the trailing edge toward the airstream direction to substantially a point distal of the wing tip of the airplane; wherein the upper surface and the lower surface of the upper winglet respectively merge with an upper surface and a lower surface of the wing. |