autorotationn.

Brit.

/ˌɔːtə(ʊ)rə(ʊ)ˈteɪʃn/, U.S.

/ˌɔdoʊˌroʊˈteɪʃ(ə)n/,

/ˌɑdoʊˌroʊˈteɪʃ(ə)n/

Origin: Formed within English, by compounding. Etymons: auto- comb. form¹, rotation n.

Etymology: < auto- comb. form¹ + rotation n.

Aeronautics.

Unpowered spontaneous rotation, esp. of a rotor or an aircraft; an instance of this.In the case of a helicopter or other rotary-wing aircraft: rotation of a rotor as a result of aerodynamic forces, independently of power from the engine. Cf. autogiro n.In the case of an aeroplane with fixed wings: a spontaneous tendency to roll that can occur at low speeds.

ΘΚΠ

society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > operation or condition of rotor

autorotation1908

coning1931

flapping1937

windmill brake state1948

feathering1970

1908 Aëronautical Jrnl. 12 46/2 (title) Notes on the autorotation of symmetrical plates in a current of air or water.

1918 Rep. & Mem. Advisory Comm. for Aeronaut. No. 549. 4 The speed of auto-rotation is very nearly proportional to the wind speed.

1930 A. Klemin Simplified Aerodynam. xiv. 197 A wing set in rolling motion will continue to roll, undamped. This phenomenon, known as ‘autorotation’ constitutes a serious danger as it leads to spin.

1935 Times 4 Mar. 11/3 Speed lift is obtained by autorotation and the whole of the engine power is available for speed.

1969 I. Kemp Brit. G.I. in Vietnam iii. 62 We were in what is called an ‘auto-rotation’—in other words, the engine had stopped but our momentum still kept the rotor blade spinning.

2007 R. Stowell Light Airplane Pilot's Guide to Stall/Spin Awareness xiv. 240 Applying right aileron in a left spin..tends to level the wings. Autorotation continues, however, but now with a different mixture of yaw and roll.

This is a new entry (OED Third Edition, June 2011; most recently modified version published online December 2021).

单词	autorotation
释义	autorotationn. Brit. /ˌɔːtə(ʊ)rə(ʊ)ˈteɪʃn/, U.S. /ˌɔdoʊˌroʊˈteɪʃ(ə)n/, /ˌɑdoʊˌroʊˈteɪʃ(ə)n/ Origin: Formed within English, by compounding. Etymons: auto- comb. form¹, rotation n. Etymology: < auto- comb. form¹ + rotation n. Aeronautics. Unpowered spontaneous rotation, esp. of a rotor or an aircraft; an instance of this.In the case of a helicopter or other rotary-wing aircraft: rotation of a rotor as a result of aerodynamic forces, independently of power from the engine. Cf. autogiro n.In the case of an aeroplane with fixed wings: a spontaneous tendency to roll that can occur at low speeds. ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > rotary wing aircraft > [noun] > parts of rotary wing aircraft > rotor > operation or condition of rotor autorotation1908 coning1931 flapping1937 windmill brake state1948 feathering1970 1908 Aëronautical Jrnl. 12 46/2 (title) Notes on the autorotation of symmetrical plates in a current of air or water. 1918 Rep. & Mem. Advisory Comm. for Aeronaut. No. 549. 4 The speed of auto-rotation is very nearly proportional to the wind speed. 1930 A. Klemin Simplified Aerodynam. xiv. 197 A wing set in rolling motion will continue to roll, undamped. This phenomenon, known as ‘autorotation’ constitutes a serious danger as it leads to spin. 1935 Times 4 Mar. 11/3 Speed lift is obtained by autorotation and the whole of the engine power is available for speed. 1969 I. Kemp Brit. G.I. in Vietnam iii. 62 We were in what is called an ‘auto-rotation’—in other words, the engine had stopped but our momentum still kept the rotor blade spinning. 2007 R. Stowell Light Airplane Pilot's Guide to Stall/Spin Awareness xiv. 240 Applying right aileron in a left spin..tends to level the wings. Autorotation continues, however, but now with a different mixture of yaw and roll. This is a new entry (OED Third Edition, June 2011; most recently modified version published online December 2021). < n.1908
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