We have an adjustable pitch propeller.
螺旋桨是可变螺距。
Analysis about an Adjustable Propeller Used in a Pusher Boat
推船采用可调桨有关问题探讨
Renewal of oil leakage at blade pivot in adjustable blade propeller turbine
转桨式水轮机桨叶枢轴漏油改造
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