slime deposition and pitch control
variable pitch contant speed wind power genetation
2-d pitch-only thrust vectoring
accumulated pitch error
accumulative pitch error
adaptive variable-pitch
adjustable pitch propell
adjustable pitch propeller
可调螺距螺旋桨
变距螺桨
调距螺旋桨
可掂螺旋桨
可变螺距螺旋桨
变距推进器
可调距螺桨
可调整螺距螺旋桨
调距推进器
adjustable radius and pitch