(US5451137-A)      A reaction turbine capable of unidirectional rotation under reversible fluid flow comprising:    a fluid flow path defined by an inflow fluid channel and an outflow fluid channel, and a turbine chamber disposed between said inflow and outflow channels;    a rotatable shaft transversely mounted in said turbine chamber;    at least one turbine blade support member fixedly mounted to said rotatable shaft for rotation therewith in a plane perpendicular to said shaft;    a plurality of turbine blades disposed transversely in said turbine chamber in a helical configuration about said rotatable shaft, each blade having an airfoil shape having a leading edge and a trailing edge and an airfoil profile lying in a plane parallel to said flow path, each of said blades fixedly mounted to said blade support member to be radially spaced from said rotatable shaft for rotation in a plane parallel to said flow path in the direction of said leading edge.    (US5451138-A)      We claim:    1. A unidirectional reaction turbine capable of rotation under reversible fluid flow comprising:    a fluid flow path defined by an inflow fluid channel and an outflow fluid channel, and a turbine chamber disposed between said inflow and outflow channels;    a rotatable shaft transversely mounted in said turbine chamber;    at least one turbine blade support member fixedly mounted to said rotatable shaft for rotation therewith in a plane perpendicular to said shaft;    a plurality of turbine blades disposed in said turbine chamber, each blade having a delta configuration and an airfoil shape having a leading edge and a trailing edge and a chord therebetween, said airfoil shape oriented transversely to said flow path with said chord lying generally along a circular rotation path, each of said blades fixedly mounted to said blade support member to be parallel to and radially spaced from said rotatable shaft and oriented for rotation along said rotation path in a plane parallel to said flow path in the direction of said leading edge; and    said turbine chamber having a curved configuration having opposite elevations in the plane parallel to said flow path, said elevations being offset in a direction of rotation of said leading edge to rotatably channel fluid in said flow path and to direct fluid flow to said plurality of blades with a radial component of flow relative to said blades.