Method for improving a blade, the blade extending in a longitudinal direction with a span from a first end to a second end and in a transverse direction of a leading edge towards a trailing edge, the blade comprising successive cross-sections, each cross-section being defined by an aerodynamic profile, each aerodynamic profile being defined by two half-profiles (11, 21) including an extrados half-profile and an intrados half-profile, the two half-profiles (11, 21) comprising a leading edge portion (12, 22), an intermediate portion (13, 23) and a terminal portion (14, 24), the leading edge portion (12, 22) of each half-profile (11, 21) being formed by a portion of an initial leading edge circle (15, 25), the method comprising a first step of modifying at least one half-profile (11, 21) of each aerodynamic profile, a second step of moving the leading edge for each aerodynamic profile of the blade and a third step of producing the blade in accordance with the modified aerodynamic profiles, the first step being provided with the following sub-steps: - increasing the radius of the initial leading edge circle (15, 25) of the at least one half-profile (11, 21) in order to form at least one new leading edge circle (35, 45) of the at least one half-profile (11, 21) of which a portion constitutes a new leading edge portion (32, 42) of the at least one half-profile (11, 21), the new leading edge circle (35, 45) being tangential to the initial leading edge circle (15, 25) of the at least one half-profile (11, 21) in the region of the leading edge, and - defining a new intermediate portion (33, 43) of the at least one half-profile (11, 21) replacing the intermediate portion (13, 23) of the at least one half-profile (11, 21) and connecting the new leading edge circle (35, 45) of the at least one half-profile (11, 21) to the terminal portion (14, 24) of the at least one half-profile (11, 21) in order to increase a negative breakaway incidence of the blade, the second step being provided with the following sub-steps: - movement of the leading edge of each aerodynamic profile of the blade by a third distance d perpendicularly to a line segment connecting the leading edge and the trailing edge, of the intrados half-profile towards the extrados half-profile, the initial leading edge portion (12, 22) or, where necessary, the new leading edge portion (32, 42) of the two half-profiles (11, 21) of the aerodynamic profile also being moved, and - defining a new intermediate portion (33, 43) of the two half-profiles (11, 21) which connect the initial leading edge portion (12, 22) or, where necessary, the new leading edge portion (32, 42) of the two half-profiles (11, 21) to the terminal portion (14, 24) of the two half-profiles (11, 21). - increasing the radius of the initial leading edge circle (15, 25) of the at least one half-profile (11, 21) in order to form at least one new leading edge circle (35, 45) of the at least one half-profile (11, 21) of which a portion constitutes a new leading edge portion (32, 42) of the at least one half-profile (11, 21), the new leading edge circle (35, 45) being tangential to the initial leading edge circle (15, 25) of the at least one half-profile (11, 21) in the region of the leading edge, and - defining a new intermediate portion (33, 43) of the at least one half-profile (11, 21) replacing the intermediate portion (13, 23) of the at least one half-profile (11, 21) and connecting the new leading edge circle (35, 45) of the at least one half-profile (11, 21) to the terminal portion (14, 24) of the at least one half-profile (11, 21) in order to increase a negative breakaway incidence of the blade, - movement of the leading edge of each aerodynamic profile of the blade by a third distance d perpendicularly to a line segment connecting the leading edge and the trailing edge, of the intrados half-profile towards the extrados half-profile, the initial leading edge portion (12, 22) or, where necessary, the new leading edge portion (32, 42) of the two half-profiles (11, 21) of the aerodynamic profile also being moved, and - defining a new intermediate portion (33, 43) of the two half-profiles (11, 21) which connect the initial leading edge portion (12, 22) or, where necessary, the new leading edge portion (32, 42) of the two half-profiles (11, 21) to the terminal portion (14, 24) of the two half-profiles (11, 21).