Abstract: A wind-powered turbine has vanes (2-5;36-39) that are pivoted (13;44) to radial arms (6;41) of its rotor (1;30,31) and are turned by rods (14;45) linking the vanes (2-5;36-39) individually to a common pivot (16;47) which is offset from the rotor-axis (8;42) on a crank-arm (17;48). The rods (14;45) constrain their pivots (15;46) with the vanes (2-5;36-39), to follow a circular path (B) centred on their common pivot (16;47) on the crank-arm (17;48) so that vane-pitch varies cyclically with rotor-rotation. Angular adjustment of the crank-arm (17;48) about the rotor-axis (8;42) varies the angular phasing of the pitch cycle within each revolution such that for constant wind speed and direction (W), rotor-speed changes.