[固]定[螺]距螺桨
fixed pitch propeller {= FPP
变螺距螺杆
Varying pitch screw
variabe pitch screw
pitch-varying spiral rod
change thread pitch screw
variable pitch screw
变螺距螺旋扫描
variable pitch helical scan
卡米瓦型可调螺距螺旋桨
KaMeWa type controllable pitch propeller
可变螺距螺桨
reversible pitch propeller