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  1. Etymology

    The English word helicopter is adapted from the French word hélicoptère, coined by Gustave Ponton d'Amécourt in 1861, which originates from the Greek helix (ἕλιξ), genitive helikos (ἕλῐκος), "helix, spiral, whirl, convolution… See more

    Design

    A helicopter is a type of rotorcraft in which lift and thrust are supplied by one or more horizontally-spinning rotors. By contrast the autogyro (or gyroplane) and gyrodyne have a free-spinning rotor for all or part of the flight envelope, r… See more

    Flight

    There are three basic flight conditions for a helicopter: hover, forward flight and the transition between the two.
    Hovering is the most challenging part of flying a helicopter. Required are constant control inpu… See more

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