Elliptical-blade NACA airfoil propeller library
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This is an OpenSCAD module library for propellers and spinners.
This design models elliptical propeller blades that transition smoothly through three different NACA airfoils, starting with (by default) NACA 8430 at the hub radius, transitioning to NACA 6412 at 33% of the blade length, ending with NACA 3412 at the blade tip.
The propeller design considerations are described in my blog article "[Elliptical blade NACA airfoil propeller](https://www.nablu.com/2022/03/elliptical-blade-naca-airfoil-propeller.html)". Please refer to that if you need to understand NACA airfoil 4-digit codes.
By default, this OpenSCAD script shows a collection of propellers. There are other demos available by ucommenting lines, including one that generates five random propellers and fans every time you reload the preview.
## Usage
To use this library in your script, put this near the top:
use <elliptical_propblade.scad>
There are four modules to be concerned with, but only the propeller() module is likely to be needed for most purposes:
* `propeller()` - this is the main module is the `propeller()` module, which calls the `propblade()` module using mostly the same parameters. By default, propeller() generates a 2-bladed, 100mm diameter elliptical aircraft propeller with a pitch of 50 mm. This module generates just the blades, not the hub. You can add that in as needed.
* `propblade()` - generates a single vertical propeller blade. The parameters deserve some explanation to understand, and…
