Aircraft winglet design having a compound curve profile

B - Operations – Transporting – 64 – C

Patent

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B64C 23/06 (2006.01)

Patent

CA 2761317

An improved vvinglet design is presented for aircraft wherein the winglet configuration is well suited for aircraft wings having moderate to no aft swept, or wings having forward swept. The winglets (302) are located at the outer end of each wing (300) and curve upwardly as they extend outwardly from their intersection (304) with the wings (300), The curvature profile (303) of the winglets (302) when viewed from the rear (or front) of the aircraft at least approximates a specified curve profile made up of more than one curved section, e.g. the winglet trailing edge profile (305) having a perpendicular projection onto a plane normal to the winglet inner or root chord (342), said projection creating a winglet profile curve approximating a compound curve composed of two arc segment (306, 307), The two arc segments are tangent to each other at there point of connection (306b, 307a) wherein the arc segment (306) at the lower portion of the winglet connects to the outer end of the wing (300) and is tangent with the wing's reference plane ( 331 ). This lower arc segment (306) of the winglet profile connects to and is tangent with a second arc segment (307) forming the profile of the upper portion of the winglet (302). A unique design specification for the plan form or developed shape of the winglet that is suitable for wings having nominal (less than 15 degrees) aft sweep, or have neutral, or forward sweep is also provided.

La présente invention concerne une conception d'ailette améliorée pour aéronef, dont la configuration est bien adaptée aux ailes d'aéronefs sans flèche ou flèche modérée, ou en flèche inversée. Les ailettes (302) sont situées aux extrémités externes de chaque aile (300) et incurvées vers le haut en s'étendant vers l'extérieur à partir de leur intersection (304) avec les ailes (300). Le profil de courbure (303) des ailettes (302), vu de l'arrière (ou de l'avant) de l'aéronef, correspond au moins approximativement à un profil de courbure spécifique composé de plus d'une section courbe, par exemple le profil de bord de fuite d'ailette (305) ayant une saillie perpendiculaire sur un plan normal à la corde interne ou la corde d'emplanture de l'ailette (342), ladite saillie créant une courbe de profil d'ailette approchant une courbe composite composée de deux segments d'arc (306, 307). Les deux segments d'arc sont mutuellement tangents au niveau de leur point de raccordement (306b, 307a), le segment d'arc (306) à la partie inférieure de l'ailette se raccordant à la partie externe de l'aile (300) en étant tangents au plan de référence de l'aile (331). Ce segment d'arc (306) inférieur du profil d'ailette se raccorde, en y étant tangent, à un second segment d'arc (307) formant le profil de la partie supérieure de l'ailette (302). L'invention concerne également une spécification de concept unique pour la forme en plan ou la forme développée de l'ailette, appropriée aux ailes en flèche, ayant un angle de flèche nominal inférieur à 15 degrés, ou bien aux ailes en flèche neutre ou inversée.

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