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2. Radio-controlled helicopter - Wikipedia

   en.wikipedia.org/wiki/Radio-controlled_helicopter

   Electric Trex 250 micro heli flying inverted Electric-powered Venom Air Corps Ocean Rescue Electric-powered Align T-rex 450SE Electric-powered E-flite Blade 400 3D Electric-powered Syma S107 This Heli-Max Axe Micro CX model helicopter is an example of a micro-sized coaxial model. Note the size comparison with the cellular telephone at right.

3. Radio-controlled aircraft - Wikipedia

   en.wikipedia.org/wiki/Radio-controlled_aircraft

   A radio-controlled aircraft (often called RC aircraft or RC plane) is a small flying machine that is radio controlled by an operator on the ground using a hand-held radio transmitter. The transmitter continuously communicates with a receiver within the craft that sends signals to servomechanisms (servos) which move the control surfaces based on ...

4. Sikorsky Firefly - Wikipedia

   en.wikipedia.org/wiki/Sikorsky_Firefly

   The Firefly was created by replacing the engine of the S-300C light helicopter, which began production in 1964 as the Hughes 300. [3] The S-300C's Lycoming 190 hp (140 kW), 5.9-liter, 4-cylinder gasoline engine was replaced with an electric motor, a new motor mount, and two battery packs located on each side of the pilot.

5. Hirobo - Wikipedia

   en.wikipedia.org/wiki/Hirobo

   Hirobo Electric Corporation (ヒロボー株式会社, Hirobō kabushiki-gaisha) is a Japanese RC model company best known for their line of high-quality radio controlled helicopter models, both glow fuel powered (also referred to as nitro powered) and more recently, electric powered.

6. Solution F/Chretien Helicopter - Wikipedia

   en.wikipedia.org/wiki/Solution_F/Chretien_Helicopter

   The Solution F/Chretien Helicopter is a coaxial electric helicopter prototype designed and built by Pascal Chretien for the Solution F company in France. The aircraft is intended to be a demonstration and exploration of several key electrical power technologies for use in future hybrid helicopters. [ 1 ]

7. Multirotor - Wikipedia

   en.wikipedia.org/wiki/Multirotor

   Cierva Air Horse - a British three-rotor "heavy lift" helicopter first flying in 1948. Three rotors were used to give a large lift without compromising rotor strength. [16] Volocopter designs - a series of German prototype electric multicopters with 18 rotors, the first electric multicopter in the world to achieve crewed flight.