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Magnetometer surveys can be useful for anomalies phenomena caused by deposits of ore. EM survey can be useful for locating underground pipes, monitoring leach heaps, locating groundwater contamination from brine or chemicals. The ares of inaccessible terrain, helicopter needed. Helicopter is too expensive for student research. For the reason, the UAV is solution. The ground effect, power wind pressure, and wind speed UAVs are weaker than helicopter. The good distance of the survey instrument position should be known. This study aims to determine the air speed distribution, with variation in rotation and distance of the measuring point from the UAV propeller. The best performance movement of UAVs is multirootor. Multirotor can move or stop at a certain height. The step of the research is measuring air speed under a quadcopter multirotor which has a maximum total thrust is not less than 10kg. The propeller which used in quadcopter is 3080 and 2255 with a 120kv-340kv brushless motor. point ao air speed from 20cm-200cm under quadcopter are measured. In this study found that the air speed is reached 21 mps.