Split blended winglet

摘要

A split winglet configured for attachment to a wing of an airplane. The split winglet may include an upper winglet smoothly extending from the wing tip above a chord plane of the wing and a ventral fin projecting below the chord plane from a lower surface of the upper winglet. The upper winglet may include a transition section which curves upward from the wing tip into a substantially planar section. Upper and lower surfaces of the upper winglet may be bounded by leading and trailing edges which are swept toward an airstream direction, parallel with the chord plane, and curve toward the airstream direction before terminating at a point distal of the wing tip. Similarly, upper and lower surfaces of the ventral fin may be bounded by leading and trailing edges which curve toward the airstream direction and terminate at a point distal of the wing tip.

主权项

1. A split winglet configured for attachment to a wing tip of a wing, 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 a root chord; 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.