An aerofoil has a main portion of aerofoil cross section, an inner spanwise root end where the aerofoil is in use secured to a supporting structure, and at an outermost spanwise end outboard of the main portion, beyond a tip station, a tip region, and the tip region including a tip edge, the planform configuration o...

A helicopter tail rotor gearbox including a housing an output shaft for connection to a tail rotor rotatably supported in the housing and having an open end therein an input member rotatably supported in the housing gearing providing a power transmitting connection between the input member and output shaft a pitch c...