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Helicopter
描述
A helicopter, or chopper, is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL (Vertical TakeOff and Landing) aircraft cannot perform.
https://engineers-channel.blogspot.com/p/how-machines-work.html
https://engineers-channel.blogspot.com/p/how-machines-work.html
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