Proprotor blade with leading edge slot

Details Proprotor blade with leading edge slot Proprotor blade with leading edge slot

B - Operations, Transporting

64

C

B64C 11/18 (2006.01) B64C 11/16 (2006.01) B64C 11/20 (2006.01) B64C 21/02 (2006.01) B64C 27/467 (2006.01) B64C 27/473 (2006.01) B64C 29/00 (2006.01)

Patent

CA 2505007

A proprotor blade (27a, 27b, 127a, 127b) having a fixed, spanwise, leading edge slot (215) located in at least the inboard portion of the proprotor is disclosed. The slot (215) is formed by a selectively shaped slat (217) disposed in a selectively shaped recessed area (219) located at the leading edge (202) of the main portion of the proprotor blade. The slot (215) is selectively shaped so that a portion of the airflow over the lower airfoil surface of the proprotor blade is diverted between the main portion of the proprotor blade and the slat (217) and exits at the upper airfoil surface of the proprotor blade. The present invention may be used on both military-type tiltrotor aircraft (11) and civilian-type tiltrotor aircraft (111) with only minor variations to accommodate the different shapes of the proprotor blades.

L'invention concerne une pale (27a, 27b, 127a, 127b) d'un rotor orientable ayant une fente (215) de bord d'attaque d'envergure et fixe, située dans au moins la partie intérieur dudit rotor. Ladite fente (215) est formée par un bec de sécurité (217) de forme choisie placé dans une zone évidée (219) de forme choisie située au niveau du bord d'attaque (202) de la partie principale de la pale du rotor orientable. Ladite fente (215) est de forme choisie de façon qu'une partie du flux d'air sur la surface portante inférieure de la pale du rotor orientable soit déviée entre la partie principale de ladite pale et le bec de sécurité (217) et sorte au niveau de la surface portante supérieure de la pale. L'invention concerne les avions à rotors basculants de types aussi bien militaires (11) que civils (111) moyennant quelques variations mineures pour répondre aux différentes formes de pales de rotors orientables.

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