The invention particularly relates to a rotor blade assembly (2a, 2b) for an engine (T), comprising at least one blade carrier (23, 24) having at least one blade (20, 21) provided with a plurality of blades (20, 21) along a blade Circumference about a central axis (M) of the blade assembly (2a, 2b) is provided, wherein - the blade carrier (23, 24) with respect to the blade (20, 21) radially inwardly in the direction of the central axis (M) extending support portion (230 240, 240), the support section (230, 240) comprises a connection region (231, 241) on which a stiffening structure (5a, 5b) with at least two, first and second stiffening elements (50, 51) is fixed, and first stiffening element (50) is arranged on a first end face of the blade carrier (23, 24) and the second stiffening element (51) is arranged on a second end face facing away from the first end side. According to a first aspect of the invention, the blade carrier (23, 24) has an annular segment or disk segment shape and the first and second stiffening elements (50, 51) are connected to the connecting region (231, 241) of the blade carrier (23, 24) and in addition to each other.
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