Tag Archives: design

CAD design of a DIY Strain Wave (harmonic drive) Reduction in Fusion 360

Strain wave gearing is known for its near zero backlash, compact design and axial construction. However it is not known for being cheap. This is why Simon Merrett created waves (pun fully intended) with his DIY 3D printed strain wave gear reduction first … Continue reading

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The ideal shape for a multirotor ‘ducted-fan’ that can dramatically improve thrust and flight time.

2018 update: User Wob Barley has built a working model of this duct based on David’s model (see update below) and done some tests which suggest an impressive 40% efficiency/40% thrust increases over open propellers. Here is a video of the … Continue reading

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