UNLIKE a helicopter, aeroplanes are inclined to fly, Harry Reasoner, a veteran American newsman, wryly observed after watching choppers in action during the Vietnam war. He wrote:A helicopter does not want to fly. It is maintained in the air by a variety of forces and controls working in opposition to each other, and if there is any disturbance in the delicate balance, the helicopter stops flying, immediately and disastrously.
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