Experiments with 3D Printed Propellers

Le Tue 09 April 2019

3D Printed Props


This is a small project to investigate 3D Printed Propellers for RC Aircraft. The propellers are generated by an OpenSCAD parametric model which gives control over the diameter, pitch, number of blades, blade airfoils, and a host of other features. The designs are for both fixed propellers and folding propellers.


Software tools required

To run the scripts described in these articles you will need OpenSCAD and Python3.

OpenSCAD

You can download the OpenSCAD software from www.openscad.org. The script uses structures that work on OpenSCAD versions from 2015 onwards.

Python 3

The python script for converting standard .dat airfoil profiles to OpenSCAD polygons does not require any extra libraries from those typically found in any Python Installation. The only one that may need to be installed is tkinter.



Parametric Propellers

Grab-bag of OpenSCAD props

This article describes the two OpenSCAD scripts used to generate fixed multi-bladed propellers or folding propellers. You will find instructions on which parameters to fiddle with and methods for changing the overall shape of the propeller. Download links are provides as are links to the Thingiverse webpages where you can find the same scripts available for use in their Customiser Application.

Parametric propellers Article



Airfoil .dat to OpenSCAD Converter

Airfoil 2 OpenSCAD converter interface

Here you will find an article describing how to use a Python 3 tool to convert Airfoil .dat files into OpenSCAD scripts which are directly compatible with the scripts introduced in the article above.

To find airfoils, look on the UIUC Airfoil Coordinates Database website. The .dat files you find there can be converted to OpenSCAD polygons using this script. I have not checked that it works on every .dat available but hopefully the python script will handle most of them.

Airfoil to OpenSCAD Converter Article



Propeller Testing Rig - Electronics

This article describes the control and measuring system for the propeller testing rig used to test the various 3D printed propellers.

Work in Progress Stamp



Propeller Testing Rig – Mechanical

The physical arrangement for testing the 3D printed propellers is quite simple. A large number of the components are 3D printed. This article describes the system and provides instructions on building the test rig and hooking in the electronics described above.

Work in Progress Stamp



Propeller Test Results

Test results will be linked here as they become available.

Work in Progress Stamp



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Note:

This series of articles and associated models and coding by Hamish Trolove are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Creative Commons License Image

Par Hamish Trolove, Catégorie : Tech Projects

Tags : Python / OpenSCAD / Models / 3D Printing / RC Aircraft /