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A rotary assembly comprising a disk having recesses at its periphery; a plurality of blades carried by the disk, each blade having a blade root engaged in a corresponding recess of the disk, and a plurality of fitted platforms each mounted on the disk between two adjacent blades, each platform being

A rotary assembly comprising a disk having recesses at its periphery; a plurality of blades carried by the disk, each blade having a blade root engaged in a corresponding recess of the disk, and a plurality of fitted platforms each mounted on the disk between two adjacent blades, each platform being a piece of sheet metal of substantially omega section having two flanks interconnected by a web and shaped so as to press against the side walls of the bottom portions of two adjacent blades, with the end portions of the flanks presenting respective setbacks which fit closely to the outlines of one side of a blade root and of the adjacent side of the wall of a recess in which the blade root is received.

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1. A rotary assembly comprising a disk having recesses at its periphery, a plurality of blades carried by the disk, each blade having a blade root engaged in a corresponding recess of the disk, and a plurality of fitted platforms each mounted on the disk between two adjacent blades, wherein each pla

1. A rotary assembly comprising a disk having recesses at its periphery, a plurality of blades carried by the disk, each blade having a blade root engaged in a corresponding recess of the disk, and a plurality of fitted platforms each mounted on the disk between two adjacent blades, wherein each platform is a piece of sheet metal of substantially omega section having two flanks interconnected by a web and shaped so as to press against the side walls of the bottom portions of two adjacent blades, with the end portions of the flanks presenting respective setbacks which fit closely to the outlines of one side of a blade root and of the adjacent side of the wall of a recess in which the blade root is received. 2. An assembly according to claim 1, wherein the web of each platform includes a stiffener. 3. An assembly according to claim 1, wherein the flanks of each platform are coated in an antiwear material. 4. An assembly according to claim 1, wherein each platform is made from a single piece of folded sheet metal. 5. An assembly according to claim 1, wherein each platform is made by folding two pieces of sheet metal and welding them together along a generator line extending along the middle of the web of the platform. 6. An assembly according to claim 1, wherein each platform is made by folding three pieces of sheet metal and welding them together along respective generator lines of each of the flanks of the platform. 7. A platform for mounting blades in recesses of a disk, the platform being constituted by a piece of sheet metal of substantially omega section having two flanks interconnected by a web and shaped so as to press against the side walls of the bottom portions of two adjacent blades, the end portions of the flanks presenting setbacks so that each of the setbacks engages between one side of a blade root and the adjacent side of the wall of a recess in which the blade root is received. 8. A platform according to claim 7, wherein its web includes a stiffener. 9. A platform according to claim 7, wherein the flanks are coated in an antiwear material. 10. A platform according to claim 7, the platform being made from folded sheet metal. 11. A platform according to claim 1, wherein, said setbacks are concave portions. 12. A platform according to claim 7, wherein said setbacks are concave portions. 13. A platform according to claim 1, wherein, for each platform, said end portions of said two flanks diverge inwardly from each other. 14. A platform according to claim 7, wherein said end portions of said two flanks diverge inwardly from each other. 15. A platform according to claim 1, wherein said two flanks have a length so that said web between said two flanks does not contact said disk. 16. A platform according to claim 7, wherein said two flanks have a length so that said web between said two flanks does not contact said disk. 17. A platform according to claim 1, wherein each of said end portions of said flanks covers a portion of a bottom surface of said blade root. 18. A platform according to claim 7, wherein each of said end portions of said flanks covers a portion of a bottom surface of said blade root. 19. A platform according to claim 1, wherein said two flanks provide a seal between the disk and the blades. 20. A platform according to claim 7, wherein said two flanks provide a seal between the disk and the blades.