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Compared to fixed-wing aircraft, helicopters are much more maneuverable. They can hover, take off and land vertically, and fly in reverse or to the side. Their range is subject only to availability of a refueling site and limitations of load and altitude. In principle, helicopters can fly anywhere and land any place with enough space (about twice the rotor disc area). Helicopters gain these advantages at the cost, in comparison to fixed-wing aircraft, of greater mechanical complexity, greater cost to buy and operate, and less speed, range, and payload capability. —The preceding unsigned comment was added by Ed Poor (talk)