From the view of fluid mechanics, the shear-free air water interface corresponds to a slip boundary condition in fluid and relatives to the concept of effective slip length.
从流体力学的角度来看，这个无剪切界面对应着流体中的滑移边界条件，而与此相关的概念是有效滑移长度。
There must be one or more universal joints to permit variations in the Angle of drive. there must also be a slip joint that permits the effective length of the propeller shaft to change.
一个或几个万向节来适应传动角度的变化；一套伸缩花键，能够改变传动轴的现有长度。
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