MD Helicopters MD 520N NOTAR (no tail rotor) helicopter.
More on the NOTAR system:
https://www.mdhelicopters.com/notar.html
Previously:
Sikorsky S-72 compound helicopter - photos
Sikorsky-Boeing SB-1 Defiant helicopter - GIF
Piasecki X-49 SpeedHawk compound helicopter - GIF
Fogle V333 Skycat tiltrotor aircraft - photos
Volocopter 2X multirotor electric helicopter - GIF
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