Patent ID: 7934906

Claim:
A turbine blade, comprising: a generally elongated blade having a leading edge, a trailing edge, a tip wall at a first end, a root coupled to the blade at an end generally opposite the first end for supporting the blade and for coupling the blade to a disc, and at least one cavity forming a cooling system in the blade; at least one elongated tip cooling chamber forming a portion of the cooling system and at least partially defined by the tip wall proximate to the first end, wherein an inner surface of the tip wall includes a plurality of curved bumper protrusions extending from the inner surface radially inward toward the root; and wherein a throat section extending between a first forwardmost curved bumper protrusion and a second immediately adjacent downstream curved bumper protrusion is offset radially outward from an inner tip surface, thereby creating a first recessed tip slot having a reduced tip wall thickness.