Abstract: The invention relates to a device for checking a plurality of indicator lights, wherein the intensity passing through each indicator light is sequentially measured and the measurements are compared with nominal intensities. The invention is more particularly applicable to the checking of the indicator lights of devices monitoring functional members.

Abstract: An uninterruptible electric power source comprising a rotor and a stator with the stator having a magnetically suspended flywheel with magnet rings for radial centering, a double electromagnet in a servoloop for restoring equilibrium including a rate sensor and lift-off logic in the servoloop encased in an evacuated vacuum enclosure. Variation in the structure of elements including the enclosure are described.

Abstract: The subject of the invention is a suspension device for a helicopter, intended for reducing the vibrations caused by its rotor. The main transmission box of the rotor is supported at the top by a set of oblique articulated bars and is bolted at its bottom to a diaphragm made of thin sheet metal, which can be deformed by bending, but not by shearing in its plane. Flexible arms arranged radially and supported by fixed mountings are articulated to the foot of the oblique bars and to the bottom of the transmission box; they each carry, at the end of a lever, a swinging weight acting by the effect of inertia.

Abstract: The present invention relates to a system for braking an aircraft taxiing on the ground. According to the invention, if an abnormality such as hydroplaning or bursting of a non-braked wheel is detected, the speed most representative of the real speed of the aircraft with respect to the ground is memorized. This memorized speed is regularly reduced to allow braking for the whole duration of the disturbance, avoiding locking or elimination of braking of the wheels of the main landing gear. The invention is more particularly applicable to the braking of wide-body aircraft.

Abstract: Device for aligning the roll axis of a rotating artificial satellite having radial solar panels equipped with angularly movable control surfaces at their extremities. The device includes a motor associated with each control surface for controlling the angle of the control surface with respect to the solar panel, each motor being actuated by a current which is dependent on the displacement of the roll axis from a desired position and which varies cyclically during the rotation of the satellite. The motor also includes a detector for detecting the angular speed of movement of the control surface and introducing a damping effect.

Abstract: A mechanical release device for releasing a member with respect to another. The device comprises a bonding element disposed on each of the members to be released, a flexible junction element placed on the bonding elements and a device permitting under the action of a mechanism the progressive raising of said flexible element and then the release of the members secured to one another. The invention preferably relates to the displaying of solar panels for a satellite in a space environment.

Abstract: The invention concerns laminated stops of curved shapes, particularly for helicopter rotors. The stop has an inner fitting and an outer fitting connected by cupped elements of a resistant and rigid material alternating with layers of flexible material. The layers of flexible material increase in thickness from their centers outwardly, and the mean thickness of the flexible layers increase from the inner fitting to the outer fitting.

Abstract: The present invention relates to a blade section for rotating wings of an aircraft comprising, between the leading edge and the trailing edge, a convex lower surface and an upper surface which is convex over the greater part of its length, but concave near the trailing edge. According to the invention, the upper surface of the section comprises a region of small extent, close to the leading edge but not contiguous thereto, in which the curvature is substantially constant. The invention is applicable to the improvement of the performances in maneuvering flight, while hovering and in advance flight of the aircraft.

Abstract: The present invention relates to a process and device for obtaining the derivation of an analog electric signal P varying slowly as a function of a variable t. According to the invention, a combination of analog means, digital means, analog-to-digital conversion means and digital-to-analog conversion means is used to form the ration (.DELTA.P/.DELTA.t). The invention is applicable to a vertical speed indicator for aircraft.

Abstract: The invention relates to a multichannel connection and to a method for transmitting pyrotechnic orders.This connection is constituted by a detonating cuttng cord incorporated into a support provided with the same number of openings as there are transmission channels which, on the basis of a single pyrotechnic signal performs a plurality of terminal functions, the connection making it possible to eliminate a certain number of components for distributing and receiving pyrotechnic orders in a logic having a plurality of pyrotechnic chains.The invention is particularly applicable to the separation and removal of the cover or cone of a ballistic missile.

Abstract: The present invention relates to a process and device for braking an aircraft taxiing on the ground after landing and comprising a plurality of braked wheels, by seeking a maximum coefficient of adherence between said braked wheels and the ground on which they roll, wherein said braking is subdivided into a plurality of successive braking periods and each of these periods is itself divided into a first phase during which a reference sliding value is imposed on each braked wheel and the optimal sliding value of the period is determined, and into a second phase during which said optimal sliding value is imposed on all said braked wheels. The invention is applicable to the automatic braking of aircraft.

Abstract: The invention relates to a process and device for braking an aircraft taxiing on the ground. According to the invention, links are provided between the left-hand pedal and the right-hand brakes and, inversely, between the right-hand pedal and the left-hand brakes, so as to limit the yawing movements. The invention is particularly applicable to the braking of a wide-track aircraft.

Abstract: The invention relates to the manufacture of woven pieces made by multidirectional weaving. A woven piece comprises, along one of the directions of weaving, temporary vertical rods which must be replaced by yarns joined to form a strand. The apparatus comprises to this end an upper assembly for detecting the position of the rods of the piece, rotating step by step, and actuating a needle with opening eye which, on descending through the woven piece, chases the rods one by one and hooks, in a lower assembly, a loop of the lacing strand and returns it into the woven piece in place of the chase rod.

Abstract: The present invention relates to a high performance blade for helicopter rotor presenting an aerodynamic surface produced by profiles of which the aerodynamic twist increases from the end profile towards the root profile and is then reversed and becomes zero at the fastenings of the blade. According to the invention, the angle of twist formed by the zero lift chord C.sub.o of a profile of the aerodynamic surface and a reference plane P passing through the center of the fastenings of the blade to the hub of the rotor, is, for the end profile, at the most equal to a value .theta..sub.1 of 0.3 degrees. The invention is more particularly applied to the obtaining of rotary wings, for example for helicopters, capable of very high performances, particularly in rapid forward flight under high load.

Abstract: The invention relates to a thermal engine provided with inlet and exhaust valves and with a system for controlling said engine comprising a computer which regulates opening and closure of said valves and which imposes on said engine an operation close to the one corresponding to minimum specific fuel consumption. According to the invention, this assembly is characterized in that said engine is essentially of the four-stroke cycle type, in that said system comprises means adapted to detect overloads of the engine and means adapted to cause the engine to operate exceptionally in two-stroke mode, these latter means being actuated by said detection means when the detected overload exceeds a predetermined threshold so that in that case the engine passes to two-stroke operation, four-stroke operation being resumed as soon as the overload has disappeared. The invention leads to obtaining a low consumption of fuel for increased power.

Abstract: The invention relates to a support for at least one photovoltaic cell, comprising at least one block made of heat-conducting material with which said cell is in close thermal contact. According to the invention, this support comprises at least one tube the wall of which may be traversed by the heat, said tube being fastened to said block, in thermal contact therewith, and closed at its end to define a closed cavity inside which an evaporable and condensable fluid is enclosed. The invention is particularly applicable to a solar generator.

Abstract: A composite structure for absorbing sound energy, comprising an outer porous layer covering a cellular layer, wherein said porous layer is made by forming a supple loose fabric from slivers each constituted by a plurality of relatively free mineral or synthetic fibres, substantially parallel to one another and shaping said supple fabric to its final form and rendering it rigid by means of a hardenable resin, while being subjected to pressure so as to become a thin, rigid lattice, with wide crossed lines, virtually uniformly smooth on at least its face opposite said cellular layer.

Abstract: The invention relates to a process and system for obtaining the maximum power from an assembly of photovoltaic cells. According to the invention, the D.C. power furnished by said assembly is converted, with the aid of a converter controlled by a modulated signal, into an A.C. power, and the value of the rate of modulation corresponding constantly to the maximum power, is determined for example with the aid of a microprocessor. The invention is applicable to the generation of solar energy with coupling on the network of a converter.

Abstract: The present invention relates to the arrangement of an artificial satellite provided with foldable solar generators and antennas. According to the invention, extensions are provided on the articulated flaps and the proximal panels, in order to be able optimally to adjust the distance of the solar generators with respect to the satellite, so that the articulation between the proximal panel and the flap is located above the folded antennas of which the ends are housed between said extensions. The invention results in elimination of the shadow cast by a satellite on its solar generators and the thermal influence of said satellite on the cells of said generators.

Abstract: The present invention relates to a process and device for braking a wheel, particularly of an aircraft taxiing on the ground. According to the invention, the action on the braking pedal is converted into electrical pulses of constant frequency and of variable duration, then into hydraulic fluid pulses which are then integrated before being applied to the brake.