Patent ID: 7905709

Claim:
A turbine having multiple turbine stages, first and second turbine stages comprising: a wheel having sixty broach slots, each one of said broach slots having an interleaved system of fillets and tangs; and a plurality of buckets each having a corresponding interleaved system of fillets and tangs so that said plurality of buckets can be fitted, one to one, into said sixty broach slots on said wheel; wherein said interleaved system of fillets and tangs on said buckets and broach slots act to reduce stresses acting on said fitted buckets and broach slots, the fillets and tangs of said interleaved system of fillets and tangs each being formed by a combination of curved and straight surfaces; wherein for each one of said plurality of buckets the distance from the bottom of the bottom most tang to the upper most straight portion of the upper most fillet is 1.9836 inches; wherein for each one of said plurality of buckets the distance from the bottom of the bottom most tang to a first intersection point of tangent lines drawn along pressure faces of the tang adjacent to the bottom most tang is 0.8429 inches; wherein for each one of said plurality of buckets the distance from the bottom of the bottom most tang to a second intersection point of tangent lines drawn along pressure faces of the upper most tang is 1.2588 inches.