DARPA recently conducted an experimental demonstration of Robotic Landing Gear. Replacing standard landing gear, the adaptive system consists of four articulated, jointed automated legs that are able to bend and fold up next to the helicopter's fuselage while in flight.
Each leg has an integrated force-sensitive contact sensor in its foot. During landing, each leg extends and uses the sensor to determine in real time the appropriate angle to assume to ensure that the helicopter stays level without risking the rotor touching the landing area.
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