In this paper, the background of whirl tower establishment in KARI was introduced and the operational test result of this KARI whirl tower was explained. The blade dynamic balancing test for Korean Utility Helicopter (KUH) on the whirl tower was presented. The whirl tower was built for rotor whirl test and dynamic balancing test for KUH which has been developed in 2012. In this operational test, the sensor measuring system of whirl tower was verified and was investigated using some trial test. The rotation signal channels were tested by using strain gauge on the rotor blade and load cell on the pitch link. The potentiometer of main rotor damper was checked. Finally, 3-axis load cell was calibrated and checked by rotational test with main rotor blade. Through this dynamic balancing test, the blade tracking information and pitch link pitching moment are need to be measured. For blade track information measurement, the optical tracker was installed to get blade tip track. For pitch link pitching moment measurement, the load cell was installed at the pitch link. To satisfy the requirement of dynamic balancing, there are three methods which are pitch link adjustment, blade tab bending and dynamic weight moment. For low pitch region, pitch link and trim tab were used to satisfy low pitch requirement. For high pitch region, dynamic weight of blade tip and trim tab were used to satisfy high pitch requirement. Through this study, it was found that it can be finished so faster to satisfy this dynamic balancing requirement. The dynamic balancing for KUH main rotor blade was conducted by using this sensitive test result. For future production phase, it can be used continuously and effectively to speed up this dynamic balancing test.
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