Abstract: A protective leading edge strip component for an aerofoil is formed from a sheet of PEEK fabric woven in two-dimensions by draping the sheet over a male moulding tool (12) the shape of which represents the shape of a leading edge of the aerofoil, and applying a female moulding tool (14) so as to trap a portion of the PEEK fabric between the two moulding tools and applying heat and pressure.

Abstract: A resin transfer molding process for an article incorporating a protective insert of polymer material such as polyether ether ketone (PEEK). A piece of PEEK material is cut and thermoformed to the required shape and then placed in position in a mold. A bead of elastomer material is formed around the edge of the insert to seal it against an internal wall of the mold in order to prevent resin tracking between the mold and insert faces during subsequent injection into the mold.

Abstract: A laminate structure comprising at least a first layer joined to a second layer by an intermediate layer. The material of the first layer is different to the material of the second layer, and the intermediate layer is composed of fibers of interwoven different first and second materials. An adhesive is provided between the intermediate layer and at least one of the first layer and second layer.

Abstract: A protective leading edge strip component for an aerofoil is formed from a sheet of PEEK fabric woven in two-dimensions by draping the sheet over a male moulding tool (12) the shape of which represents the shape of a leading edge of the aerofoil, and applying a female moulding tool (14) so as to trap a portion of the PEEK fabric between the two moulding tools and applying heat and pressure.

Abstract: A compressor or fan casing is provided with a casing treatment to improve the surge margin of an unshrouded rotor stage. The casing treatment takes the form of an insert (20) let into the casing wall (10) to provide a plurality of re-circulation grooves (22) in the wall circumscribing the path of the rotor blade tips. The insert consists of a plurality of arcuate insert segments (20) made of a carbon fiber reinforced resin. In the preferred construction each arcuate segment (20) is formed with axially extending tangs (28,29) on either side that are received into the correspondingly shaped sides (38,40) of a receiving channel (16) in the casing wall (10). The casing (10) may be split on a diametric plane, thus exposing groove ends (38,40), into which the tangs (28,29) carried by the inserts (20) can be slid before the casing (10) is finally assembled.

Abstract: A resin transfer moulding process for an article incorporating a protective insert of polymer material such as polyether ether ketone (PEEK). A piece of PEEK material is cut and thermoformed to the required shape and then placed in position in a mould. A bead of elastomer material is formed around the edge of the insert to seal it against an internal wall of the mould in order to prevent resin tracking between the mould and insert faces during subsequent injection into the mould.

Abstract: A laminate structure (2) comprising at least a first layer (10) joined to a second layer (12) by an intermediate layer (14). The material of the first layer (10) is different to the material of the second layer (12), and the intermediate layer (14) is composed of fibres of interwoven different first (16) and second (18) materials. An adhesive (20,22) is provided between the intermediate layer (14) and at least one of the first layer (10) and second layer (12).

Abstract: This invention provides a seal assembly for sealing a gap between first and second relatively movable members. The first member is provided with a sealing surface, and the second member is provided with a sacrificial abradable layer that is positioned opposite the sealing surface of the first member. When the seal assembly is in operation the sealing surface of the first member moves relative to, and abrades, the abradable layer of the second member thereby maintaining a seal between the members. The present invention is characterised in that, the second member and the abradable layer comprise the same composite material. The second member and the abradable layer may be co-cured together during manufacture.

Abstract: A compressor or fan casing is provided with a casing treatment to improve the surge margin of an unshrouded rotor stage. The casing treatment takes the form of an insert (20) let into the casing wall (10) to provide a plurality of re-circulation grooves (22) in the wall circumscribing the path of the rotor blade tips. The insert consists of a plurality of arcuate insert segments (20) made of a carbon fibre reinforced resin. In the preferred construction each arcuate segment (20) is formed with axially extending tangs (28,29) on either side that are received into the correspondingly shaped sides (38,40) of a receiving channel (16) in the casing wall (10). The casing (10) may be split on a diametric plane, thus exposing groove ends (38,40), into which the tangs (28,29) carried by the inserts (20) can be slid before the casing (10) is finally assembled.