Patent ID: 9353764
Filing Date: 2016-05-31
CPC Classification: F04D,F05D

Claim Text:
1. A fan propeller comprising: a hub and blades which extend radially towards the exterior from the hub wherein each blade has a developing profile with a neutral axis and a span which extends between a leading edge and a trailing edge of said blade, wherein each blade has, on at least part of a length of each blade, a first profile formed in the shape of a flattened S, such that the neutral axis makes possible a point of contraflexure, and has two opposite concavities comprising a positive concavity between the leading edge and the point of contraflexure, and a negative concavity between the point of contraflexure and the trailing edge, wherein each blade has a second profile which starts from the second profile in a region at the level of the hub, and ends in a profile of an aircraft wing type, without a point of contraflexure of the neutral axis in an end re ion of the blade.