Abstract: A wind turbine duct arrangement having a plurality of frusto-conical ducts each having an open apex and an open base defining an air intake, the ducts radially joined at their apexes to define a convergence zone wherein operatively rotating blades of a turbine may be installed transverse to the plurality of ducts. In use, the turbine duct arrangement provides a combination catchment and channelling area through the open bases of the plurality of ducts for channelling wind intake through the arrangement onto blades of a wind turbine transversely installed in the convergence zone defined by the radially joined apexes of the plurality of ducts.

Abstract: A pipe fitting according to the invention comprises a body (1.1) and a nut (2), the body (1.1) having at least one sleeve adapted to snugly receive a pipe end (7) and provided with external threading (14) and a spigot (11), the spigot (11) having at its leading end an external partly tapered forward section (12), and the nut (2) having internal threading which matches the external threading (14) on the sleeve and an internal taper (10) at the far end of the threading, the arrangement of the forward section, tapers and threading being such that when the sleeve and the nut are screwed together the forward section of the spigot (11) comes into contact with the internal taper (10) of the nut and is deflected inwardly to grip a pipe end (7) which is in the sleeve.