Abstract: This invention relates to a blade for shrouded propeller, wherein: in plan, its aerodynamically active part presents a rectangular shape; and the maximum relative camber of the successive profiles constituting the aerodynamically active part of the blade increases from a value close to 0 to a value close to 0.04; the twist of the aerodynamically active part of the blade decreases from a first value close to 12.degree. to a second value close to 4.degree., then increases to a third value close to 4.5.degree.; and the maximum relative thickness of said successive profiles decreases from a value close to 13.5% to a value close to 9.5%.

Abstract: This invention relates to a section for shrouded propeller blade, of which the relative thickness is included between 9% and 15%, wherein, the curvature of said section having a maximum value at the leading edge thereof, the upper surface line comprises three successive portions, such thatin the first portion, the curvature decreases rapidly from said maximum value at the leading edge to a value close to 20 at a first point of which the reduced abscissa is close to 1%;in the second portion, the curvature decreases more slowly from said value close to 20 at said first point up to a value close to 1 at a second point, of which the reduced abscissa is close to 25%; andin the third portion, the curvature is less than 1 between said second point and said trailing edge.

Abstract: The invention provides a rotary aircraft airfoil comprising an attachment for fixing to a hub, a current part having a leading edge and a trailing edge and whose profile has a chord of constant or evolutive length, and a tip which extends said current part outwardly and whose leading edge extends the leading edge of said current part rearwardly in a sweep, said tip being in addition downwardly slanted. This blade is remarkable in that the downward slant of said blade tip extends over the whole of the span of this tip and is continuous from the connection with the current blade part as far as the end edge of said tip so that said tip follows a curvature such that its extrados is convex and its intrados is concave.