1 # AN AIRFOIL AND PLATFORM ASSEMBLY FOR SUPERSONIC FLOW The invention relates to an assembly comprising an airfoil for a turbine engine bladed wheel together with a platform on which the airfoil is to be mounted, the 5 assembly as formed in this way being arranged in such a | manner that a plurality of airfoils fastened on the platform or on a plurality of assembled-together platforms can form a bladed wheel. The term "platform" is used herein to designate a part that defines the 10 radially inner side of an interblade passage formed between two adjacent airfoils of a bladed wheel. The term "platform surface" is used to designate the platform surface that faces the interblade passage. The platform surface may also designate the assembly of the platform 15 surfaces of a bladed wheel considered collectively. In known manner, the airfoils of a bladed wheel may be made integrally with the rotor disk in order to constitute a bladed wheel. The part made in this way that combines both airfoils and their platforms is 20 referred to as a one-piece bladed wheel. In another embodiment, the airfoils are made independently from the rotor disk (i.e. they constitute distinct parts). Under such circumstances, the airfoils are formed with respective roots enabling them to be fastened to the 25 rotor disk, thereby constituting blades. The assembly comprising blades on the rotor disk thus constitutes a bladed wheel. The invention seeks an advantageous arrangement of an airfoil relative to the platform surface; such an : 30 arrangement may be provided in the various constructions described above, independently of whether the platform and the airfoil do or do not constitute distinct parts. The invention seeks more particularly t