In the idling mode, there is an upper limit to a pitch angle of the blades 8 and under the control of the control unit 40, {HEAD ~ the pitch drive mechanism} controls {TAIL ~ the pitch angle} of the blades 8 in the range that does not exceed the upper limit 
controls
In the idling mode , there is an upper limit to a pitch angle of the blades 8 and under the control of the control unit 40 , { HEAD ~ the pitch drive mechanism } controls { TAIL ~ the pitch angle } of the blades 8 in the range that does not exceed the upper limit
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