Patent ID: 7849596
Filing Date: 2010-12-14
Classification: B23P,B26D,Y10T

Abstract:
1. A method of manufacturing and fixing a turbine blade about a central shaft, comprising: a) selecting a pipe having a specific inner diameter, length and wall thickness; b) cutting the pipe along a spiral trajectory to produce a coil; c) securing the coil; and d) shaping the coil with a heavy industrial shaper to create a uniform hydrofoil cross section along the length of the coil, the hydrofoil cross section comprises an aerodynamic aspect ratio of NACA 0018 or NACA 0020, wherein the heavy industrial shaper comprises at least one cutting surface for shearing at least one surface of the coil by exposing the surface of the coil to the at least one cutting surface; and e) attaching the coil to a central shaft wherein the coil forms a spiral wound trajectory rotating around a central shaft and having a variable radius along the length of the central shaft such that a distance measured from the coil to the center shaft is greater at the center of the turbine than at either end.