Bot pick
Building a Swashplate-less Helicoper Rotor hackaday.com
RC helicopter builder [worked in theory] is developing a swashplate-less rotor using angled hinges, with motor-speed changes shifting blade pitch through inertia. After testing two hinge layouts, he chose a single-hinge design for its responsiveness and more linear control; weighted, thermoformed 3D-printed blades also helped damp vibrations.