NOVELTY - The turbine (1) has a blade body located wholly or partly in fluid and attached to a hub. The blade body, which is rotatable about the turbine rotation axis (3), includes rotor blades (10-H1,10-H2,10-H3,10-V1,10-V2,10-V3) and blade joints (13). The blade joints are attached to each other by intermediate components comprising the rotor blades.    USE - Turbine for producing useful energy from motion of streaming fluid, such as wind, steam, tidal streams, or water waves.    ADVANTAGE - The blade body is twist free when it is not spinning, as it does not have built-in twist-induced stresses that may cause undesirable blade body deformations. The high ratio for rotor blades makes the fluid feasible to flow in whole or in parts in a laminar stream over the wing profile, reducing blade resistance and increasing turbine efficiency. Pulsating cosine load is distributed more uniformly over the entire angle of rotation, reducing or eliminating risk of material fatigue, undesirable vibrations, and resonance of blade body, and also reducing noise associated usually with wind turbines. The blades are joined to each other on different radial distances to the turbine rotation axis, reducing risk of turbulent flow from one blade affecting following rotor blade. The blades on different distances may have different cross-sections for maximizing energy from blades having largest rotational speed. Unnecessary twist and skewing of the blade cross-section may be avoided if the lifting force vector over the wing profile attaches in one and same line normal to the rotation axis. Since annoying noise or turbulence is reduced, the turbine can be located in an urban environment.    DETAILED DESCRIPTION - The turbine (1) has a blade body located wholly or partly in fluid and attached to a hub. The blade body, which is rotatable about the turbine rotation axis (3), includes rotor blades (10-H1,10-H2,10-H3,10-V1,10-V2,10-V3) and blade joints (13). Each rotor blade extends in axial and radial directions of a helix exhibiting an axis coinciding with the rotation axis, and exhibits a handedness around the rotation axis and in a plane normal to the helix axis. The blade cross-section exhibits a centerline normal to the cross-section and a wing profile with two end sections. One end section is provided with a round nose coinciding with the direction of rotation of the blade body. The other end section is provided with a taper oriented opposite the rotation direction. A point of intersection is defined between the rotation axis and a line normal to the same axis. Each blade joint exhibits a point of intersection between the centerline of one rotor blade and the line normal to the axis of rotation, and another point of intersection between the centerline of another blade and the same line. The points of intersection are joined by a joint line normal to the axis of rotation and exhibits an end point in the point of intersection. The successive rotor blades exhibit different hands around the rotation axis and attached together by the blade joints. The blade body exhibits a diameter and a midpoint coinciding with the point of intersection between the axis of rotation and a mid-normal plane (M). The blade joints are attached to each other by intermediate components comprising the rotor blades.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of rotor blades.    Turbine (1)    Turbine rotation axis (3)    Rotor blades (10-H1,10-H2,10-H3,10-V1,10-V2,10-V3)    Blade joints (13)    Mid-normal plane (M)