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aircraft identification - What is the definining line between a helicopter and a drone a person can ride in? - Aviation Stack Exchange
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Understanding The RC Quadrocopter
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Quadcopter vs. Drones: What's the Difference? — Fortress UAV
Drone Vs. Helicopter - What Is The Difference? - YouTube
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RC Quadcopter vs Helicopter (And Why We Prefer Both) | RC Roundup
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aircraft design - Why haven't quadcopters been scaled up yet? - Aviation Stack Exchange
Quadcopter - Wikipedia
Fun Facts About Quadcopters and Helicopters - Drone Examiner