spiral effect of slipstream
... directed slipstream 转向滑流 spiral effect of slipstream 滑流螺旋效应 propeller race, slipstream 螺旋桨尾流 ...
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地面效应装置(如气垫船)，倾斜旋翼机或任何依靠螺旋桨所产生向下的滑流而悬浮的航空器，皆不属于直升机。
Ground effect machines (hovercraft), convertiplanes or aircraft that hover by means of propeller slipstream (s) deflected downward are not considered to be helicopters.
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