Gyro-ruler

thingiverse

This teaching aid demonstrates the workings of an autogyro/gyrocopter using simple rotor heads made from plastic rulers as crude aerofoils. The creator is experimenting with auto-rotation and admits it's not intended to fly, serving as a low priority project. They're unsure about critical factors for auto-rotation and currently lack a good wind source for testing. Contradictory information online regarding blade pitch has them leaning towards slightly positive pitch for fixed rotors. A recent update showed weak auto-rotation with zero pitch rulers in front of an industrial fan, questioning the air flow's authenticity. STL files are available for different parts: a zero-pitch ruler mount, a 3-degree pitch ruler holder, a gyro head with teeter bolt holes, and various aerofoil options for printing stability and resembling real gyrocopters.