A confluence of technologies and manufacturing capabilities has led to an onslaught of remotely controlled quadcopters in the hands of hobbyists. Low-cost motors and mass-produced propellers provide the power to keep them in the air. Weight is kept down, but structural integrity is maintained by strong, engineered plastics and composites. And chip-based controllers, gyros, navigation, and cameras give them high-end capabilities and features while keeping costs down...
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