| 单词 | quarter-chord |
| 释义 | > as lemmasquarter-chord quarter-chord n. Aeronautics a quarter of the length of a chord of an aerofoil, as measured backwards from the leading edge; the point on a chord this distance from the leading edge; (also, attributive) designating a line joining such points along the span of a wing. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > [noun] > plane or aerofoil > chord or part of chord chord1918 quarter-chord1946 1946 Jrnl. Royal Aeronaut. Soc. 50 436/2 The centre of pressure is at the half-chord instead of approximately at the quarter-chord point. 1947 C. F. Toms Introd. Aeronautics i. 26 The quarter-point of the mean chords lies very nearly on the quarter-chord line of the wing. 1957 L. L. Beckford A.B.C. of Aeronaut. 98/2 This angle, known as Sweep Back, is measured between the lateral axis and a line drawn a quarter-chord back from the leading edges. 2000 Philos. Trans. (Royal Soc.) A. 358 3281 The aerofoil is subjected to a harmonic oscillation about its quarter-chord axis. < as lemmas |
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