| 释义 |
red-out|ˈrɛdaʊt|
[f. red a. and n.; cf. black-out.]
A reddening of the vision resulting from an accumulation of blood in the head when the body is accelerated downwards.
1942Richmond (Va.) Times-Dispatch 21 Dec. 13/1 The doctors learn airplane ambulance work... They learn about grayouts, blackouts and redouts. 1943Effects of Flight (U.S. Navy Training Div., Bur. Aeronaut.) iv. 70 High numbers of g's acting upward through the vertical axis of the body can be produced..and when these are excessive there may be the sensation of everything turning red, followed by unconsciousness. This has been called ‘red-out’. 1946R. A. McFarland Human Factors in Air Transport Design ix. 363 Values of - 2 or - 3g produce fullness and a throbbing pain in the head. The vessels of the eyes become congested, and reddening of vision, or ‘red-out’, may occasionally occur. 1962F. I. Ordway et al. Basic Astronautics xii. 463 If the acceleration is applied in the opposite direction, then a condition known as red-out occurs... The blood..increases in weight to the point where the heart can no longer pump it. 1970Daily Tel. (Colour Suppl.) 10 July 25/2 With a severe bout of negative G you get a red-out, when so many vessels burst that your vision becomes crimson and you see through a haze of blood. 1980Verbatim Winter 19/1 Too many positive G's may cause loss of consciousness—a red-out.
Hence red ˈout v. intr., to undergo or experience a red-out. See also redding vbl. n.1 2.
1955M. Relfer Dict. New Words 175 Red out, to experience a red field of vision, congestion of the face and, in particular, the eyes, pressure in the head, etc., as a result of blood rushing to the head in certain aerial maneuvers, such as a rapid climb, inverted spins, outside loops, etc. 1980Verbatim Winter 19/1 A pilot is in danger of redding out when an aerial maneuver puts a strong positive-G stress on his body. |