Abstract: The invention relates to a structure of open porosity in the form of a flat or curved panel made up of superposed layers of fibres with the orientation of the fibres varying from one layer to the next. The fibres are boron filaments held parallel in each layer by criss-crossing of filaments with another type. The boron filaments are bonded together at their crossing points to join superposed layers.The invention also provides a method of making such porous structure.

Abstract: This invention relates to an improvement in an engine suspension for aircraft having at least one bearing with a vertical thrust bolt which introduces into the aircraft cell shearing or tangential forces acting transversely to the longitudinal axis thereof, and a hoisting device for the engine assembly, the improvement comprising bearing means between the engine and the aircraft cell which bearing means permits vertical movement, anchoring means adapted to be attached to the engine, and detachable coupling means adapted to be connected between said anchoring means and said hoisting device, whereby a rigid connection for supporting said engine is produced.

Abstract: A fabric comprising warp and woof (weft) has dense and strong boron fibers and boron-compound fibers constituting the weft and utilizes an open warp having a supportive function for the boron weft thereby obtaining high strength in the weft direction.

Abstract: A device for wing droops assembled on the leading edge of an aircraft wing and capable of occupying either a retracted position for flight in the clean configuration or an extended position, projecting before and below the wing, for producing extra lift, comprising a hydraulic valve controlling the supply of hydraulic fluid to jacks which operate the droops, the valve being fitted with a pilot-operated manual control and an automatic control adapted to be actuated by an angle of attack detector of the aircraft.