Fibonacci Windmill

The fan blades of this windmill are based on the Fibonacci Curve and works with wind in any direction. An optical illusion sits on top.

3D Printer

PETG Filament

Optional Velcro Straps, 1-1/2" x 18", 2 ea.

STL files

Slicing software for your printer

As a number sequence expands by adding the previous two numbers, the ratio of the last two numbers approaches 1.618... . The above PowerPoint slide describes how the fan blade configuration was developed. Unlike some wind machines, this one operates effectively in all wind directions. When turning, the two rings on the top provide an interesting optical illusion. They seem to roll around each other. The pointed lower section provides a very low friction bearing that allows the system to turn at low wind speeds.

You can secure the base to a porch railing using two velcro straps.

The STL files describing the fan are provided, should you want to make one. Mine will go on the porch railing.

I tried using PLA, but it failed in the sum within a few hours. Use PETG or any filament designed for the weather and sun.