Transverse axis fluid turbine for use in a working fluid flow

A transverse axis fluid turbine for use in a working fluid flow comprising:

• a rotor having four blades and an axis defining a turbine axis about which the rotor rotates, each blade having a pressure surface and being spaced from the axis of the rotor such that there is a gap between the axis and an inner edge of each blade through which fluid can flow, and the inner edge and an outer edge of each blade lying in and defining a blade plane and wherein the blade plane passes through the blade between the inner and outer edges of each blade, and each blade being offset from the axis of the rotor such that the axis does not lie in the blade plane, wherein the blade planes of adjacent blades are substantially perpendicular to each other and wherein the blade plane of a first one of the blades is substantially perpendicular to the pressure surface of a second, adjacent one of the blades, and the blade plane of a first one of the blades is positioned between an end of the second adjacent one of the blades and a midway point of the second, adjacent one of the blades;
• an inlet section comprising a casing partially surrounding the rotor, the casing having an inlet to permit a portion of the working fluid flow to enter the casing to drive the rotor;
• and
• an exhaust region at an axial end of the inlet section, such that fluid flow through the inlet section is from the inlet to the exhaust region, the exhaust region being axially offset from the inlet;
• wherein angles between the blades are such that part of the fluid flow within the inlet section is deflected by the pressure surface of the first one of the blades through said gap between the axis and the blade inner edge and onto the pressure surface of the second, adjacent one of the blades.