Abstract: A vertical axis and transversal flow nautical propulsor continuously self-orients the blades. The propulsor includes a plurality of blades rotatable about a vertical axis; a blade supporting plate for supporting the blades, wherein the blade supporting plate is rotatable about a vertical axis independent of rotation of the blades; a motor for rotating the blade supporting plate; a motor for each blade, for rotating the blade about its own vertical axis; and a rotatable shaft. The rotatable shaft is supported by a rotor body coupled with the blade supporting plate. A plurality of spindles are provided on the rotatable shaft, wherein the spindles are coaxial with one another and with the rotatable shaft. The number of spindles corresponds to the number of blades, and the spindles are rotatable independent of one another in such a way to allow independent rotation of the relevant blade. The rotatable shaft and the spindles each have an inner end within the rotor body and an outer end outside the rotor body.