Abstract: Rotor stage of an axial turbine comprising a shaft, adapted to rotate around an axis, and a plurality of blades, having at least one airfoil portion, which extends in a substantially radial direction normal to the axis, at a first radial distance from the axis, being arranged a number of airfoil portions lower than the number of airfoil portions arranged at a second radial distance from the axis, the first radial distance being smaller than the second radial distance, said rotor stage comprising a plurality of bearing blades, and a plurality of additional blade, said bearing blades comprising a first and a second rest element said additional blade being connected to said two subsequent bearing blades.

Abstract: Rotor stage of an axial turbine comprising a plurality of vanes and a plurality of attenuators interposed between each pair of subsequent vanes, said attenuator impeding the rotation of the vane profiles caused by the centrifugal force during the operation and achieving a stiffening of the rotor vane array.

Abstract: A system for absorbing energy to attenuate a force caused by an impact includes: an elongated tubular element; a fixed ring having a plurality of wedge-shaped flanges associated with the elongated tubular element; and a mobile element associated with the fixed ring. In response to movement toward the wedge-shaped flanges, the mobile element interacts with the wedge-shaped flanges, which in turn interact with the elongated tubular element so as to trigger collapse of the elongated tubular element.

Abstract: The present invention refers to an apparatus for absorbing energy attenuating a force caused by an impact. In particular it refers to a triggering system for the plastic collapse of a metal structural element, particularly suitable for attenuating forces generated by high-velocity impacts, such as in the case of aircraft accidents. In one embodiment the triggering system for the plastic collapse of a metal structural element comprises: an elongated tubular element; a fixed ring having a plurality of wedge-shaped flanges associated to said elongated tubular element; a mobile element sliding in the direction of said elongated tubular element and associated with said fixed ring; said mobile element, in response to its movement in the direction of said wedge-shaped flanges, interacts with said wedge-shaped flanges which in turn interact with said elongated tubular element so as to trigger a collapse of said elongated tubular element.