propellers螺旋辊propellern.螺旋桨；推进器=propellor.propeller dead stick螺旋桨停转propeller efficiency推进器效率propeller shaft tube传动轴轴套propeller load curve螺旋浆载荷曲线propeller propulsion[机] 螺旋推进propeller shaft yoke传动轴叉propeller blade angle[机] 螺桨叶角propeller blade width推动机刀宽propeller-disc area螺旋桨盘面积propeller pitch ratio推进器齿节比