ABSTRACT OF THE DISCLOSUREThe invention provides a device for imparting a movementof rotation to a craft with nozzle propulsion system duringlaunching thereof by means of a launching member, said devicecomprising, a wheel with vanes or fins formed by a section of tubelocated in the rear extension of the nozzle, the tube sectionhaving an outer surface at least partly in permanent contactwith the launching member during its path inside said latter,and bearing, on the inside, vanes or fins constituting surfacesdeflecting the jet produced by the nozzle, the wheel being dividedinto distinct annular sectors juxtaposed to form said tube section,each sector extending over an angle at the most equal to 180°,and bearing at least one vane or fin, and connecting means com-prising at least one locking element associated with each annularsector to render this latter fast with the nozzle in the directionof rotation about the axis of the nozzle and parallel to thisaxis, said connection means cooperating with the launching memberto maintain, upon launching, the wheel in fixed position withrespect to the nozzle, and to allow the separation of said deviceand the craft, on leaving the launching member.
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