Abstract: The invention relates to a rotational device that is to be used in a fluid in order to generate power from the moving stream of a fluid or to convert energy into a motion of a fluid. Said rotational device comprises main rotating means which is fixedly connected to a central rotary shaft of the rotational device, one or several rotational surfaces which are mounted on the main rotating means so as to be rotatable about rotational surface rotary shafts spaced away from the rotary shaft such that the main rotating means are able to perform a rotational motion about the central rotary shaft by means of at least one rotational surface, the rotational surface rotary shafts extending parallel to the rotary shaft of the main body. A device is provided which adjusts an angle of the rotational surface relative to the direction of flow of the fluid in such way that the buoyancy principle is maintained on the rotational surface.

Abstract: The invention relates to a rotational device to be used in a fluid to extract energy from a moving fluid stream or to convert energy into a motion of a fluid comprising main rotating means which is fixedly connected to a central rotary shaft of the rotational device, one or more rotational surfaces coupled rotatable about their rotational surface shafts, spaced away from the rotary shaft, and mounted on the main rotating means such that the main rotating means can execute by at least one rotational surface a rotational motion about the central rotary shaft, the rotational surface shafts extending parallel to the shaft of the main body, pivoting means or controlling means being provided to control or adjust the position of the rotational surface(s) relative to a direction of the moving fluid stream and comprising a respective adjusting sleeve (51, 52, 53) and/or an adjusting frame for each rotational surface, the adjusting sleeve and/or adjusting frame is arranged freely rotatable around the central rotary sha

Abstract: The invention relates to a rotational device that is to be used in a fluid in order to generate power from the moving stream of a fluid or to convert energy into a motion of a fluid. Said rotational device comprises main rotating means which is fixedly connected to a central rotary shaft of the rotational device, one or several rotational surfaces which are mounted on the main rotating means so as to be rotatable about rotational surface rotary shafts spaced away from the rotary shaft such that the main rotating means are able to perform a rotational motion about the central rotary shaft by means of at least one rotational surface, the rotational surface rotary shafts extending parallel to the rotary shaft of the main body. A device is provided which adjusts an angle of the rotational surface relative to the direction of flow of the fluid in such way that the buoyancy principle is maintained on the rotational surface.