Patent ID: 6923623

Claim:
A turbine bucket including a bucket airfoil having an airfoil shape and a plurality of cooling holes extending between root and tip portions thereof, said airfoil having a nominal profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table II wherein the Z values are non-dimensional values from 0.05 span to 0.95 span convertible to Z distances in inches by multiplying the Z values by a height of the airfoil in inches, and wherein X and Y are distances in inches which, when connected by smooth continuing arcs, define airfoil profile sections at each distance Z, the profile sections at the Z distances being joined smoothly with one another to form a complete airfoil shape, said holes including at least a first hole adjacent a leading edge, at least a second hole adjacent a trailing edge and a plurality of holes intermediate said leading and trailing edge holes, said plurality of intermediate holes including holes spaced from one another on opposite sides of a mean camber line between said leading and trailing edges wherein certain of said intermediate cooling holes form a generally airfoil-shaped envelope within and along the airfoil between said root and tip portions, said first, second and intermediate holes identified as holes numbered, H 1 , H 16 and H 2 -H 14 , respectively, in Table I, holes being located in accordance with X and Y coordinate values set forth in Table I in a plane passing through the root of the airfoil section at 5% span.