Massive 41-inch Blades Deliver Clear Efficiency Wins on This Custom-Built Quadcopter Drone

Daniel Riley built a custom quadcopter with 41-inch blades that spin at just 350-500 rpm instead of the thousands typical in commercial drones, paired with a variable pitch system that adjusts blade angles while maintaining constant motor speed. This design achieved remarkable efficiency, producing 18.1 grams of thrust per watt during hover tests—roughly half the power consumption of conventional quadcopters. The carbon fiber and 3D-printed drone demonstrates how larger rotors and pitch control can dramatically extend flight time without adding heavier batteries.