Abstract: A method of needling a fiber layer, includes first needling the fiber layer by a needling head, during which the fiber layer is caused to move in translation relative to the needling head, wherein needles of the needling head are distributed uniformly over a surface of the needling head; after the first needling, shifting the fiber layer relative to the needling head along a shift direction through a distance d equal to N·x·p, where N is an integer not less than 1, x is a coefficient greater than 0, and less than 1, and p designates the pitch of two consecutive needles of the needling head along the shift direction; and second needling the fiber layer, after the shifting, and during which the fiber layer is moved in translation relative to the needling head, the needles not penetrating, during the second needling, into the holes formed during the first needling.

Abstract: A casing (20) of a propellant feed turbopump (10) for a rocket engine (50), the casing including a cooling circuit (30), wherein the cooling circuit is formed at least in part in a wall of said casing (20).

Abstract: A solid propellant auxiliary booster intended to be attached to the main body of a launcher comprises a cylindrical body extending in a longitudinal direction between a rear face in communication with a nozzle and a front face formed by a conical structure connected to the cylindrical body of the booster. The cylindrical body delimits a first internal volume and the conical structure of the front face delimits a second internal volume. The auxiliary booster contains a solid propellant charge. The first internal volume of the cylindrical body communicates with the second internal volume of the conical structure. The solid propellant charge is present both in the first and second internal volumes.

Abstract: A pyrotechnic switching device comprising a first and a second pyrotechnic initiators, and a body in which are present: an electrically conductive portion, and a mobile switching element having an insulating relief facing the conductive portion. The device also comprises a fuse element connected in series with the conductive portion, the first initiator being connected to the terminals of the fuse element so that tripping the fuse element actuates the first initiator, each initiator being configured to cause the device to switch from a current conducting configuration to a current interrupting configuration, the mobile switching element being set in motion toward the conductive portion in order to break it by the impact of the relief during switching from the first to the second configuration.

Abstract: A fire extinguisher including a body extending along a longitudinal axis and defining a storage chamber wherein a load of an extinguishing agent is present, and also a pressurizing chamber including a pyrotechnic gas generator, the pressurizing chamber being separated from the storage chamber by a perforated wall configured to put an outlet of the pyrotechnic gas generator into communication with the storage chamber, the perforated wall defining an end of the storage chamber, the extinguisher having a discharge channel configured to deliver the extinguishing agent to the outside of the extinguisher during actuation of the pyrotechnic gas generator, the discharge channel opening out into the storage chamber through an opening positioned at a distance from the perforated wall, as measured along the longitudinal axis of the body, that is less than or equal to half the length of the storage chamber.

Abstract: A method of evaluating the corrosion resistance of a coated metal substrate, the method including putting a liquid composition into contact with a corrosion protection coating present on the surface of a metal substrate, the liquid composition including water, a gelling agent, corrosion-catalyst ions, and a color pH indicator; gelling the liquid composition in order to form a corrosion-accelerator gel in contact with the coating; performing a corrosion test during which the gel that has formed is left in contact with the corrosion protection coating; and evaluating the corrosion resistance of the substrate coated by the corrosion protection coating by observing the color of the color pH indicator present in the gel after performing the corrosion test.

Abstract: A device to stabilize and deorbit a satellite includes a pair of coplanar masts, each one carrying at least one membrane forming an aerobraking web. The masts are fixed to the satellite along non-parallel axes. Each mast is provided on the opposite end of the satellite with a mass to generate a gravity gradient. The end of each mast is fixed to the satellite. The masts form, with the bisectrix between the masts, a fixed angle to align the bisectrix with the satellite speed vector at any altitude.

Abstract: The invention relates to the field of feeding devices, in particular for feeding rockets on the ground. A feeding device (4) of the invention comprises at least two mutually complementary feeding connectors (5, 6), a breakable connection member (15) connecting these two feeding connectors (5, 6) together and presenting a breakable section (15c) between these two feeding connectors (5, 6), and a force transmission member (16) connected to said breakable section (15c) in such a manner as to transmit a breaking load thereto in order to unlock the connection between the two feeding connectors (5, 6). During unlocking, a breaking load transmitted by the force transmission member (16) thus serves to break the breakable section (15c).

Abstract: A method of fabricating a needled fiber structure using a needling machine having a needling head with a plurality of needles, the method including placing a first fiber layer on a support; needling the first fiber layer, with the needling head being in a first position relative to the support, at least at the end of needling the first layer; after needling the first layer, implementing relative movement between the support and the needling head so as to cause the needling head to go from the first position relative to the support to a second position that is different from the first; placing a second fiber layer on the needled first fiber layer; and needling the second fiber layer placed on the first fiber layer, the needling head being in the second position relative to the support at least at the beginning of needling the second fiber layer.

Abstract: A modulation device for modulating a gas ejection section, the device being for placing in a nozzle upstream from the throat of the nozzle, the modulation device including a plug having a downstream end forming a member for partially obstructing the nozzle throat; and a plug guide having an internal housing in which the upstream end of the plug is present. The upstream end of the plug is suitable for sliding in the internal housing of the plug guide between a first position in which the upstream end of the plug is present in an upstream portion of the internal housing, and a second position in which the upstream end is present in a downstream portion of the internal housing. The upstream end of the plug is held in the first position by at least one retaining element for breaking under the effect of heat.

Abstract: Propeller for an aircraft engine comprising: a blade mounting associated with each blade, mounted so as to pivot on the hub according to an incident pitch axis; a pivoting link between each blade mounting and the root, allowing the blade to pivot relative to the blade mounting thereof according to a blade collapsing axis; associated with at least one of the blades, a member for controlling the collapsing/extension of the blade configured to pivot the root relative to the blade mounting according to the collapsing axis; and a passive device for synchronising the collapsing/extension of the blades, including a central synchronisation element mounted so as to rotate relative to the hub according to the propeller rotation axis, as well as a coupling element associated with each blade, including a first end mounted on the blade root and a second end mounted on the central synchronisation element.

Abstract: A needling installation includes a rotary support on which a fiber texture is wound to form a fiber preform, the rotary support being mounted on a frame that is movable along a second axis Y perpendicular to the first axis X; a stripper including one plate including perforations; a needling module having a needle board carrying needles; a contact force application system connected to the stripper; a contact force sensor for providing information representative of the contact force with which the outside face of the plate of the stripper makes contact against the fiber preform, and a controller to control the contact force application system to apply a force to the plate of the stripper that is predetermined as a function of information provided by each contact force sensor and as a function of a target value for a predetermined contact force.

Abstract: A method of fabricating an opto-pyrotechnic initiator, includes a) forming a body having a cavity in which a pyrotechnic charge is to be received, the body also having an internal passage extending between the cavity containing the pyrotechnic charge and an inlet opening out in an outside face of the body; b) placing a first portion of an optical fiber in the internal passage of the body, with a second portion of the optical fiber extending beyond the inlet of the body, and a glass preform being interposed between the optical fiber and the inlet of the body; and c) applying heat treatment to the glass preform to raise the glass preform to a temperature higher than the melting point of the glass preform so as to form a hermetic sealing element made of glass between the optical fiber and the inlet of the body.

Abstract: An injector of a propellant combustion member, the injector including a first feed and a second feed; the first feed being connected to a plurality of feed chimneys arranged around a longitudinal axis; the second feed being configured so as to feed an injection chamber; and the injection chamber being connected to a plurality of feed sheaths with injection orifices, each feed chimney being surrounded by a coaxial feed sheath; the injector including a takeoff chamber connected to a takeoff duct for taking off the second propellant, the takeoff chamber being arranged in such a manner as to take off the second liquid propellant from the injection chamber; and it is configured to achieve uniform injection of the second propellant via the injection orifices.

Abstract: An emission/reception device is configured for communication between a ground station and a mobile craft which is provided with a retro-reflector configured to modulate a laser beam received along a direction and to return it along the direction, the mobile craft being situated above a backscattering zone, the emission/reception device generating at least two temporally offset emission/reception sequences, each being associated with a laser beam and comprising successive pairs of associated emission and reception phases, the emission phase including emitting a laser beam from the ground station towards the mobile craft, and the reception phase including receiving a laser beam returned by the retro-reflector, each reception phase being deactivated during the transit through the backscattering zone of the laser beam emitted during the associated emission phase.

Abstract: A breaker device for connecting in an electrical circuit, the device includes a pyrotechnic initiator and a body having present therein: a pressurizing chamber in communication with an outlet from the pyrotechnic initiator; at least one electrically conductive portion for connection to the electrical circuit; at least one fusible element connected in series with the conductive portion, the initiator being connected to the terminals of the fusible element and the fusible element being configured to trip when the current passing through it exceeds a predetermined value, thereby actuating the initiator; and a movable breaker element; the pyrotechnic initiator being configured to cause the breaker device to pass from a current-passing first configuration to a circuit-breaking second configuration, the movable breaker element being moved on passing from the first configuration to the second in order to disconnect the conductive portion.

Abstract: The invention relates to a method for controlling a lightning protection system comprising a descent path. The method is characterized in that it comprises steps for: sending (E1) a radiofrequency signal to one end of the descent path, measuring (E2) a reflection coefficient, predetermining (E2) resonance frequencies of the descent path; and, comparing (E3) the predetermined resonance frequencies with preset resonance frequencies.

Abstract: A system allowing for the tilting of the rocket motor such that, in the tilted position, the centre of the nozzle is located at least approximately on the neutral orientation axis of said rocket motor.

Abstract: A device for generating gaseous dihydrogen, includes a body defining an inside volume having present therein a storage first compartment defined by a first wall and for receiving a hydrogen storage material; a conveyor second compartment, the first compartment surrounding the second compartment and being separated therefrom by a second wall, a conveyor system being present in the second compartment and configured to transport the hydrogen storage material from an inlet of the second compartment communicating with the first compartment to an outlet of the second compartment; and a recovery support in communication with the outlet of the second compartment and connected to the first and second walls, the support being movable in the first compartment. The device also includes a drive system for actuating the conveyor system and the movement of the recovery support in the first compartment; and a heater system configured to heat the second compartment.

Abstract: A cardan joint spider comprising a body having four right-angled brackets, each bracket presenting two mutually perpendicular arms, the arm of one bracket being assembled to the arm of an adjacent bracket so as to form a cross-shaped spider having four branches.