Patent ID: 7300253

Claim:
A gas turbine blade or vane, comprising: a blade or vane root which is profiled in cross section, extending in a longitudinal direction from a first end surface to a second end surface, and is successively adjoined by a platform; and a blade profile that is curved in the longitudinal direction and is formed by a suction-side convex profile wall and a pressure-side concave profile wall and the blade or vane root extending in the longitudinal direction of the blade profile and the platform having a suction-side, convexly bent platform longitudinal edge and a pressure-side concavely bent platform longitudinal edge, both platform longitudinal edges extending in the longitudinal direction, wherein the blade or vane root is shaped in such a manner that the blade or vane root surface along the suction-side profile wall and the blade or vane root surface along the pressure-side profile wall are respectively convexly and concavely curved in accordance with the associated platform longitudinal edge wherein a line of curvature extending along one of the blade or vane root surfaces in the longitudinal direction, from the first end surface to the second end surface along the blade or root shape, is on an arc of a circle parallel to the platform longitudinal edges.