Research In Motion
In this paper, the authors create a retractable landing gear, because it is used mainly to reduce the drag in the aircrafts. Here, they have made a RC plane where they have kept their landing gears under the wings. They have followed the two axis system where the landing gear folds in sideways. The main concept is they have used here an automatic retraction of the landing gear using a micro-controller board and a sensor, where the sensor will detect the surface from a certain altitude and will open automatically and will again retract into the wing when it reaches a certain altitude from the ground.