However, the solid model of the runner blade is formed from the airfoils in cylindrical surface. The equations can be used for sketching in 2D plane. This airfoil has 4 different lines with their own equation. 460, it is explained that NACA 4 Digit Series is created by combining mean line with the thickness variation curve of Gottingen 398 and Clark Y. 460 and modelling methodology proposed by Milos in his paper. To create the codes, two sources have been used: NACA report no. The Equation Curve tool requires the codes for creating the spline lines. Currently, Autodesk Inventor has introduced the new tool that help sketching the spline lines either in 2D plane or 3D space simplifying the task of 3D modelling of propeller turbine blade, called Equation Curve. However, the road taken is quite complicated and should be repeated from the beginning whenever new geometrical characteristics of a new axial propeller turbine will be modelled. One of them is titled CAD Modelling of Axial Turbine Blade using Autodesk Inventor. Published paper on modelling of propeller turbine blade and runner is not commonly found, especially those using Autodesk Inventor.
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