According to the present invention, a movable house and a surrounded house are utilized. When a drone is mounted on a floor of the movable house, in case of training, combat, or rain, in accordance with a situation, the movable house is used to protect the drone. A technical field of the present invention is Archimedes′ law of the lever, wherein rolling frictional force vertical drag physical quantity force = distance law. A problem to be solved refers to an international application number: PCT/KR2016/000441. A means for solving the problem refers to an international application number: PCT/KR2016/000441.;COPYRIGHT KIPO 2018
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