Abstract: The present invention relates to a device for purging combustion residues from a thruster that comprises firstly a combustion chamber designed to receive a solid propellent and secondly a nozzle for evacuating propulsion gases and connected to the bottom of said chamber while leaving an annular space in which liquid residues of propellent combustion can accumulate. The device comprises at least one tube fixed on the converging part of the nozzle by fixing means, said tube including a first end dipped in the mass of liquid formed by said combustion residues and at a determined distance j from the bottom of the chamber, and a second end emerging level with the top end of the converging part and set back a little from the throat of the nozzle.

Abstract: The present invention relates to a mechanical and insulating connection between, on the one hand, a filament-wound casing, constituting a wall for the combustion chamber of a solid propellant rocket motor, and on the other hand, a hot nozzle made from a heat-conducting refractory material wherein said connection consists of a single connecting ring fixed to the nozzle and resiliently connected to the wound casing, which ring is made from a low density insulating material, resistant to mechanical forces, as well as to mechanical shocks and thermal stresses, preferably a composite material with multidirectional reinforcements and a ceramic matrix.

Abstract: An unfoldable divergent nozzle for a rocket engine comprises a set of elementary individual panels of a refractory material articulated together and with respect to a fixed upstream portion of the divergent nozzle in the vicinity of the neck of the nozzle. The articulations between two adjacent panels arranged to be folded on one another with their inner surfaces facing one another; each comprise at least one hinge with two axles inserted in the walls of the two panels articulated to one another, and held at a constant distance from one another by a link set back with respect to the thickness of the panel. Two adjacent panels have in the vicinity of a hinge two cylindrical surfaces respectively centered on each of the axles and rollable without sliding on one another.