Stator aerofoil for a gas turbine engine, comprising: a body portion (412); at least one panel (424) which forms at least part of one of either the pressure or suction surface of the aerofoil; at least one internal chamber (434) which is bounded by the bod...

A turbocharger has a shaft (2) formed of a strong material such as steel and an impeller (1) formed of a relatively weaker material such as aluminium alloy. The impeller is mounted on the shaft by means of an internally-threaded insert (3), for example als...