| 单词 | spiral divergence |
| 释义 | > as lemmasspiral divergence spiral divergence n. Aeronautics = spiral instability n. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > aeroplane > qualities and parameters of aircraft > [noun] > spiral stability or instability spiral instability1914 spiral stability1947 spiral divergence1949 1949 Jrnl. Royal Aeronaut. Soc. 53 541/1 There are two common kinds of aircraft instability which usually would be judged tolerable according to the above criterion. These are the phugoid oscillation (longitudinal-symmetric motion) and the spiral divergence (lateral-antisymmetric motion). 1970 T. Hacker Flight Stability & Control vii. 159 The possibility of eliminating spiral divergence by design can be made to stand out by means of stability diagrams. < as lemmas |
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