Provided is a blade (1) for a helicopter anti-torque device, comprising a duct rotor wing (13); the blade (1) comprises different section components, a leading edge (2) and a rear edge (2), wherein the blade comprises components composed of at least two sections (5)(6), stacking lines (4) of each wing type extending at a distance ranging between 25 and 50 percent of a wing chord (C) from the leading edge (2) of an aerodynamic profile, wherein the stacking lines (4) is in a curve shape in the surface of the blade (1); the curve is successively provided with a sweepback, a sweepforward and a last sweepback; and a wing chord (C) becomes bigger when moving towards the section (6) of the blade (1) from at least an end portion wing type (1a) so as to reach an end portion wind value; the end portion wing value is smaller than or equal to 1.6 times of a reference cord (Cref) of the root section (5) of the blade (1).
Blade for a helicopter anti-torque device
2015-04-01
Patent
Elektronische Ressource
Englisch
IPC: | B64C AEROPLANES , Flugzeuge |