A helipad is a landing area or platform for helicopters and powered lift aircraft.
While helicopters and powered lift aircraft are able to operate on a variety of relatively flat surfaces, a fabricated helipad provides a clearly marked hard surface away from obstacles where such aircraft can land safely.
Larger helipads, intended for use by helicopters and other vertical take-off and landing aircraft, may be called vertiports.
How much area is needed to land a helicopter?
The ideal landing zone is a level, 100-by-100-foot or larger area of grass or hard surface. Most civilian medevac helicopters in use today have a main rotor diameter of 35-50 feet and a fuselage length with main rotor blades turning of 40-50 feet