From RC Helicopter Wiki
Retracts, or retractable landing gear is landing gear used on scale aircraft that can be withdrawn into the body of the aircraft when in flight, and lowered again for landing. On full size aircraft it significantly reduces the drag generated on the aircraft in fast forward flight.
Retracts are operated by a high torque retract servo or compressed gas, using a designated servo channel (traditionally channel 5) whose position is selected by a switch on the radio. It could also be linked to the flight mode so that the landing gear extends on approach to landing or during practice autorotations. Retract servos are designed to only work in two positions, which they lock into firmly, and often operate slowly to give the impression of full size operation.
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