空气缸体执行机构所采用的机械弹簧可以达到20,000磅的推力，及最大14英寸的冲程限制，主要取决于所需要的输出推力。

Mechanical springs used with air cylinders can be sized for up to 20,000 Ibs. of thrust and have a stroke limit of about 14 "max. depending on thrust output required."

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推力限制解释了为什么它总是适当使用最大直径可最大限度地输出扭矩。

The thrust limitation explains why it is always appropriate to use the maximum diameter available to maximize output torque.

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必定有人提出反对意见：显然，封闭系统不能输出对外的推力，但只会产生应变在波导内墙壁。

The inevitable objection raised, is that the apparently closed system produced by this arrangement cannot result in an output force, but will merely produce strain within the waveguide walls.

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