| 摘要 |
The present method is characterized by providing the rotor blade with a tab 3 , which can advance and retreat with respect to rear of rotating direction of the rotor blade between a position where the tab protrudes from a trailing edge of the rotor blade and a position where the tab does not, and providing an actuator 4 , which advances and retreats the tab 3 , and operating the actuator 4 so that the tab advances and retreats in response to rotating timing of the rotor blade 2 , when reducing the BVI noise of the rotor blade of a helicopter. Thus, the BVI noise of a helicopter can be reduced effectively.
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