The Breguet-Richet Gyroplane was an early French experimental quadcopter rotary-wing aircraft developed by Breguet Aviation. == Design and development == The Gyroplane No.I was one of the earliest attempts to create a practical rotary-wing aircraft.
The Breguet-Richet Gyroplane was an early French experimental quadcopter rotary-wing aircraft developed by Breguet Aviation. == Design and development == The Gyroplane No.I was one of the earliest attempts to create a practical rotary-wing aircraft.
Source: Wikipedia "Breguet-Richet Gyroplane" · CC BY-SA 4.0
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