Screw propeller for a pod drive of an ice-going vessel, for fitting on a propeller shaft, comprising - a propeller hub, made so that it can be rigidly attached to the conical tailpiece of the propeller shaft, and - screw propeller blades, each of which comprises a blade foil and a blade flange, made in one piece, mounted on the propeller hub, the blade foil passing into the blade flange via a fillet (64, 65), wherein the weakest portion for the possible destruction of the blade in the cross section of its foil is located immediately adjacent to the transition between the fillet (64, 65) and a profile of the blade foil, characterized in that the generatrix connecting the extreme outer radii (R1, R2) of the outer surface of the blade flange in the meridional cross section of the screw propeller is curved inside towards the axis of the propeller, so that, when a blade failure load BFL acts on the screw propeller at a radius of application (R_BFL), the distance between the cross section of the transition of the blade foil into the flange at the intersection between said curved generatrix and a relatively axial line of the blade foil and the propeller axis is less than a distance (R_53) of the intersection of a cross section of a transition of the blade foil into the flange at an intersection between the relatively axial line of the blade foil with the generatrix being a straight line, so that the distance in said meridional section between the weakest cross section of the blade foil when said BFL acts on the screw propeller at said radius of application (R_BFL) and the propeller axis is smaller than the distance between the weakest cross section of the blade foil of a screw propeller where the outer surface of the blade flange is defined by a generatrix being a straight line. - a propeller hub, made so that it can be rigidly attached to the conical tailpiece of the propeller shaft, and - screw propeller blades, each of which comprises a blade foil and a blade flange, made in one piece, mounted on the propeller hub, the blade foil passing into the blade flange via a fillet (64, 65), wherein the weakest portion for the possible destruction of the blade in the cross section of its foil is located immediately adjacent to the transition between the fillet (64, 65) and a profile of the blade foil, characterized in that the generatrix connecting the extreme outer radii (R1, R2) of the outer surface of the blade flange in the meridional cross section of the screw propeller is curved inside towards the axis of the propeller, so that, when a blade failure load BFL acts on the screw propeller at a radius of application (R_BFL), the distance between the cross section of the transition of the blade foil into the flange at the intersection between said curved generatrix and a relatively axial line of the blade foil and the propeller axis is less than a distance (R_53) of the intersection of a cross section of a transition of the blade foil into the flange at an intersection between the relatively axial line of the blade foil with the generatrix being a straight line, so that the distance in said meridional section between the weakest cross section of the blade foil when said BFL acts on the screw propeller at said radius of application (R_BFL) and the propeller axis is smaller than the distance between the weakest cross section of the blade foil of a screw propeller where the outer surface of the blade flange is defined by a generatrix being a straight line.