螺旋桨的叶片在靠近水面上方横向效应不强，足以抵消低刀片相反的效果。
The transverse effect of the propeller blades at the top near the surface of the water is not strong enough to counteract the opposite effect of the lower blades.
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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