From RC Helicopter Wiki
The components attached to the underside of a helicopter's fuselage which enable the helicopter to safely land on the earth (or a ship, or a building, etc.). The most basic form of landing gear for a helicopter is a set of skids, because they are simple and inexpensive. A more complex form of helicopter landing gear are wheels, which can be fixed in place, or be retractable into the fuselage. Unlike skids, wheels also allow heavily loaded helicopters to make rolling takeoffs, somewhat like a conventional aircraft which requires less fuel than lifting off vertically.
Most RC helicopters have skids, but other types of landing gear are indeed seen on scale models.
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