Rotor Downwash 1
Rotor Downwash 1 : Movement of air caused by the rotation of the principal rotor of a helicopter during landing or take-off. When there is loose material on the ground (such as ash or sand), the rotor downwash creates an opaque cloud which surrounds the helicopter and which totally or partially reduces the visibility for the pilot. This situation also makes individuals on the ground vulnerable to the risk of flying fragments of various sizes
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