Aerial propellers more especially for aircraft propulsive units
AssigneeOffice National d'Etudes et de Recherche Aerospatiales
InventorsJean-Marc Bousquet, Alain Faubert
Life of this patent
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Abstract
The invention provides improvements to aerial propellers, particularly for aircraft propulsive units, wherein the cowling of the propeller is defined by a meridian line having: at its origin (B) a maximum curvature greater than 15; then a curvature decreasing rapidly from the maximum value to a value of 7; then a curvature decreasing linearly from the value 7 to a value of 0; than a curvature decreasing more slowly from the value 0 to a minimum value between -3 and -5; then a curvature increasing rapidly from the minimum value to a value of 0.
Claims4
An aerial propeller, particularly for aircraft propulsive units, having a plurality of blades projecting from a cowling at a distance L from the leading edge of said cowling, wherein said cowling is defined by a meridian line having:
- at its origin, forming the leading edge of the cowling, a maximum curvature greater than 15,
- between its origin and a first relative abscissa point X=x/D equals 0.05, a curvature decreasing rapidly from the maximum value to about a value of 7,
- between said first point and a second point situated at a distance from the leading edge between 0.5 and 0.7 times the leading edge--blade plane distance L, a curvature decreasing substantially linearly from a value 7 to a value 0,
- between said second point and a third point situated in the plane of the blades, a curvature decreasing more slowly than said linear decrease, from value 0 to a minimum value between -3 and -5,
- between said third point and a fourth point situated in the rear plane of the cowling, a curvature increasing rapidly from the minimum value to a value of 0.
Dependencies are inferred from the claim text.