Patent ID: 8235669

Claim:
An axial flow hydraulic turbine with fixed blade mounting comprising: a plurality of runner blades, each of the runner blades includes a blade portion and a mounting flange, wherein a base of the blade portion joins or abuts the mounting flange, the base forms an oblique angle with an axis of the turbine, and the mounting flange includes a planar hub abutting surface portion; a hub for supporting the runner blades, the hub comprising a non-planar, annular outer surface having a plurality of recesses, each of the recesses corresponds to one of the plurality of runner blades, each of the recesses having a planar flange seating surface portion for seating the planar hub abutting surface portion of the mounting flange of the runner blade corresponding to the recess, wherein the outer surface of the hub at the plurality of recesses is tapered with respect to the axis of the turbine to converge radially inwardly in a direction of water flow through the hydraulic turbine; and a fastener attaching in a fixed position each of the runner blades to the hub where each hub mounting flange meets the hub.