The XY-plane projection of the spiral must be logarithmic spiral. If A=0,5 the spiral radius grows 0,5 mm for every millimeter rise along the Z axis. We can write for example R = AZ where A is a constant. It means that the radius of the spiral (=R) changes linearly along the Z-axis. The pitch changes non-uniformly so that a short piece of curve whips air by being positioned to a certain predefined angle against the airflow when the spiral is rotated around its axis:Īssuming that guess is OK and using the Z-axis of the ordinary XYZ coordinate system as the spiral axis we can write a few facts The guess is: You want a distorted tapered helix which is still on a cone, but it's not linear. I am not an exception so you get only a guess. Some of us may well know something of it, but most of us in GDSE draw and mangle 2D images and make layouts, so do not expect a flood of answers. You used term angle of attack which sounds like it's taken from turbine or airplane propeller engineering.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |