桨叶表面展开图
blade surface development
连续表面展开天线
continuous surface deployable antenna
表面桨
surface piercing propeller
表面桨推进
surface piercing propeller
桨叶展弦比
propeller blade aspect ratio
螺旋桨桨叶安装角
angle of propeller blade setting
平直叶桨叶
vertical-blade turbine impeller