Abstract: In a gas turbine engine, the booster compressor is driven by both the low pressure or fan shaft and high pressure shaft through a differential gear arrangement. The rotational speed of the booster compressor is intermediate between the speed of the fan and the speed of the high pressure compressor.

Abstract: In a gas turbine engine, the booster compressor is driven by both the low pressure or fan shaft and high pressure shaft through a differential gear arrangement. The rotational speed of the booster compressor is intermediate between the speed of the fan and the speed of the high pressure compressor.

Abstract: In a mounting for a gas turbine engine, the engine is pivotally mounted about its center of gravity to an aircraft support structure by means of a pair of radially outwardly extending trunnions. Each trunnion is connected to a central conical section of engine casing by means of an axially extending intermediate support member. The support member is secured to the downstream end of the conical casing section at an axial location offset from the trunnion. During operation distortion of the less stiff conical section is reduced by virtue of the resultant shear force distribution across the casing.

Abstract: This invention provides a means for reacting the axial loads F.sub.A experienced by for example, the combustion chamber inner and outer casings 24, 30 and the inlet guide vanes of 26 of the turbine of a gas turbine engine, through the outlet guide vanes 22 of the compressor and to the supportive engine outer casing 28 without imparting a torsional load on the outlet guide vanes 22. The means comprises a plurality of loading bars 32 formed in the combustion chamber outer casing 30 which are angled relative to the applied axial load F.sub.A at the same angle as the chord line C of the outlet guide vanes 22 is angled relative to the engines center line C.sub.L. A significant proportion of the axial load F.sub.A is reacted along the load bars 32 and through the vanes 22 without importing twist into said vanes. The comparatively small torsional reaction load required is reacted through the inlet guide vanes 26 of the turbine 16.

Abstract: A stator assembly for a turbomachine having a sealing plate which co-operates with sealing members on an adjacent rotor assembly to form air seals. The sealing plate is provided with a thermal slugging mass, the thermal response of which controls the rate of expansion and contraction of the sealing plate to match that of the rotor. In this way tip clearances between the stationary and rotating parts of the air seals are maintained substantially uniform throughout all operating conditions of the turbomachine.

Abstract: A nozzle guide vane assembly for a turbomachine comprises a plurality of segments mounted in an outer casing by means of pins which locate in slots. The slots are angled relative to radial planes so that the reaction force exerted by the pin normal to the length of the slot produces a tangential and radial force. The radial force opposes the couples produced on each segment by gas loads and the tangential reaction force.