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A fluid-flow machine includes a rotor which extends along a rotation axis. The rotor has a rotor-shaft slot having a slot root surface and a moving blade having a blade root. The blade root is inserted into the rotor-shaft slot, and a gap is formed between the blade root and the slot root surface. A

A fluid-flow machine includes a rotor which extends along a rotation axis. The rotor has a rotor-shaft slot having a slot root surface and a moving blade having a blade root. The blade root is inserted into the rotor-shaft slot, and a gap is formed between the blade root and the slot root surface. A sealing element is provided for sealing the gap, which sealing element is at least partly accommodated by the blade root and is movable relative to the blade root. In addition, a sealing element, in particular for a rotor of a fluid-flow machine, preferably includes a first sealing element section and a second sealing element section. The sealing element develops its sealing effect under the effect of an external force, in particular of the centrifugal force.

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A fluid-flow machine includes a rotor which extends along a rotation axis. The rotor has a rotor-shaft slot having a slot root surface and a moving blade having a blade root. The blade root is inserted into the rotor-shaft slot, and a gap is formed between the blade root and the slot root surface. A

A fluid-flow machine includes a rotor which extends along a rotation axis. The rotor has a rotor-shaft slot having a slot root surface and a moving blade having a blade root. The blade root is inserted into the rotor-shaft slot, and a gap is formed between the blade root and the slot root surface. A sealing element is provided for sealing the gap, which sealing element is at least partly accommodated by the blade root and is movable relative to the blade root. In addition, a sealing element, in particular for a rotor of a fluid-flow machine, preferably includes a first sealing element section and a second sealing element section. The sealing element develops its sealing effect under the effect of an external force, in particular of the centrifugal force. ted on said plate shaft extension, cooling air holes disposed through and extending axially through said plate web, and a circumferential row of radially extending circumferentially spaced apart tabs. 2. An annular disk side plate as claimed in claim 1, further comprising: radially inner most inner cylindrical surface of said plate shaft extension, an outer cylindrical surface of said plate shaft extension that is spaced radially outwardly of said inner cylindrical surface, and said plate shaft extension having an axial attenuation length L that is at least equal to 1.25 times the square root of a product of an attenuation radius R measured from a midline about half way through a shaft wall thickness T of said plate shaft extension to said centerline and said shaft wall thickness T. 3. An annular disk side plate as claimed in claim 2 further comprising a recess extending axially aftwardly into said plate hub and having a radially outer rabbet joint corner. 4. An annular disk side plate as claimed in claim 3 further comprising a radially outwardly extending annular ridge located directly between said plate shaft extension and said recess. 5. An annular disk side plate as claimed in claim 4 further comprising two axially aftwardly extending annular sealing ridges. 6. An annular disk side plate as claimed in claim 1, wherein said plate rim is canted aftwardly from said plate web. 7. A rotor assembly comprising: an annular disk comprising a disk hub, an annular disk shaft extension extending axially forward from said disk hub, a disk web extending radially outwardly from said disk hub, a disk rim extending radially outwardly from said disk web, a plurality of rotor blades mounted in and extending radially outwardly from said disk rim, a forward facing seal face on said disk rim; an annular disk side plate mounted on an annular forward facing side of said disk, said side plate comprising an annular plate hub, an annular plate shaft extension extending axially forward from said plate hub, a plate web extending radially outwardly from said plate hub, a plate rim extending radially outwardly from said plate web, at least one annular sealing ridge extending aftwardly from said plate rim, an anti-rotation means for preventing rotation of said side plate, and cooling air holes disposed through said side plate; said plate shaft extension mounted on said disk shaft extension, and a pre-loading means for pre-loading said side plate in compression against disk and sealing said annular sealing ridge against said seal face by axially securing said plate shaft extension to said disk shaft extension. 8. A rotor assembly as claimed in claim 7 wherein said pre-loading means includes an annular groove in a radially outer surface of said disk shaft extension, a ring disposed in said groove, said ring axially engaging said groove and said plate shaft extension. 9. A rotor assembly as claimed in claim 8 wherein said anti-rotation means is disposed on said plate and disk shaft extensions. 10. A rotor assembly as claimed in claim 9 wherein said anti-rotation means includes: a plurality of first tabs depending radially inwardly from and circumferentially disposed around said plate shaft extension, a plurality of second tabs depending radially outwardly from and circumferentially disposed around said disk shaft extension, first tab spaces between said first tabs, and second tab spaces between said second tabs wherein said first and second tabs are circumferentially interdigitated wherein said first tabs are disposed in said second tab spaces and said second tabs are disposed in said first tab spaces. 11. A rotor assembly as claimed in claim 10 wherein said ring axially engages an aftwardly facing surface of said groove and axially engages a forwardly facing surface of said plate shaft extension. 12. A rotor assembly as claimed in claim 8 further comprising an annular collar member circumferentially disposed around said plate sha