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Helicopter flight controls are used to achieve and maintain controlled aerodynamic helicopter flight. [1] Changes to the aircraft flight control system transmit mechanically to the rotor, producing aerodynamic effects on the rotor blades that make the helicopter move in a desired way.
Translational lift is improved rotor efficiency resulting from directional flight in a helicopter.Translation is the conversion from the hover to forward flight. [1]: 2–27 As undisturbed air enters the rotor system horizontally, turbulence and vortices created by hovering flight are left behind and the flow of air becomes more horizontal.
In 2013, a combination of stereophotogrammetry and rigid-body correction in post processing was shown to be a valid tool for performing these studies, and the dynamics of a Robinson R44 helicopter were measured during hovering flight, to determine blade dynamics (e.g. harmonics) and the deflection profile. [2]
For a stationary (hovering) helicopter, whose blades of length of r metres are rotating at ω radians per second, the blade tip is moving at a speed rω meters per second. As the blades rotate, the speed of the blade-tips relative to the air remains constant. Now imagine the helicopter in forward flight, at v meters per second.
For an overloaded helicopter that can only hover IGE it may be possible to climb away from the ground by translating to forward flight first while in ground effect. [11] The ground-effect benefit disappears rapidly with speed but the induced power decreases rapidly as well to allow a safe climb. [ 12 ]
Coning is a phenomenon which affects helicopter rotor discs. The tips of the helicopter rotor blades move faster through the air than the parts of the blades near the hub, so they generate more lift, which pushes the tips of the blades upwards, resulting in a slight cone shape to the rotor disc. This is balanced by centrifugal force.
The helicopter was flying a training mission to re-qualify the pilots for flight in the area — something they’d done several times before, according to deputy director of aviation for the Army ...
The tail rotor and the systems that provide power and control for it are considered critically important for safe flight. As with many parts on a helicopter, the tail rotor, its transmission, and many parts in the drive system are often life-limited, meaning they are arbitrarily replaced after a certain number of flight hours, regardless of ...
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