Abstract: A fluid-driven turbine includes a main driving shaft defining a shaft axis and a plurality of blade sets symmetrically disposed about the main driving shaft. Each of the plurality of blade sets includes a rod extending radially from the main driving shaft in a direction transverse to the shaft axis. The rod defines a rod axis. Each blade set also includes a fluid-tiltable blade connected to the rod and extending along the direction of the rod axis. It has an airfoil shape in cross-section with a leading edge, a trailing edge, and a maximum thickness. The blade is divided into first and second moment-inducing sections located on opposite sides of the rod with the first moment-inducing section being greater in area than the second moment-inducing section. Also, it is rotatable about the rod axis between an optimum pressure-receiving position and a least fluid-resistance position for receiving fluid energy from variable directions.