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单词 ground cushion
释义

> as lemmas

ground cushion
ground cushion n. and adj.
ΚΠ
1949 Jrnl. Royal Aeronaut. Soc. 53 317/1 For take-off at altitude, a strong ‘ground cushion’ is an advantage.
1956 N.Y. Times 8 Jan. x. 41/5 The issue revolves about a phenomenon peculiar to helicopters known as ground cushion effect. What it means is this: Up to ten or twelve feet off the ground, or over water, a helicopter receives added buoyancy by the packed mass of air churned downward from the overhead rotors.
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