vertical speed indicator

An instrument which displays rate of climb or descent. a. Barometric--An instrument which displays the apparent vertical speed of the aircraft as derived from the rate of change of static pressure. b. Instantaneous--An instrument which displays the vertical speed of the aircraft as derived from a combination of accelerometric and barometric sources.

vertical speed indicator

[′vərd·ə·kəl ¦spēd ‚in·də‚kād·ər] (aerospace engineering) rate-of-climb indicator

vertical speed indicator (VSI)

A flight instrument that indicates the rate of climb or descent or the zero, or level, position at 9 o'clock. The VSI is a sensitive pressure gauge that senses the rate of change of static pressure. Atmospheric pressure is led directly into an aneroid capsule or a diaphragm contained within the case of the instrument. Air is permitted to leak at a relatively slow rate through a capillary tube into the casing. The difference between the quick change in pressure within the aneroid capsule and the relatively slow rate at which this pressure is equalized within the case causes the capsule to expand or contract. This movement is magnified and indicated on the dial through a system of gearing. See also instant rate of climb indicator.

单词	vertical speed indicator
释义	vertical speed indicator vertical speed indicator An instrument which displays rate of climb or descent. a. Barometric--An instrument which displays the apparent vertical speed of the aircraft as derived from the rate of change of static pressure. b. Instantaneous--An instrument which displays the vertical speed of the aircraft as derived from a combination of accelerometric and barometric sources. vertical speed indicator vertical speed indicator [′vərd·ə·kəl ¦spēd ‚in·də‚kād·ər] (aerospace engineering) rate-of-climb indicator vertical speed indicator (VSI) A flight instrument that indicates the rate of climb or descent or the zero, or level, position at 9 o'clock. The VSI is a sensitive pressure gauge that senses the rate of change of static pressure. Atmospheric pressure is led directly into an aneroid capsule or a diaphragm contained within the case of the instrument. Air is permitted to leak at a relatively slow rate through a capillary tube into the casing. The difference between the quick change in pressure within the aneroid capsule and the relatively slow rate at which this pressure is equalized within the case causes the capsule to expand or contract. This movement is magnified and indicated on the dial through a system of gearing. See also instant rate of climb indicator. AcronymsSeevery seriously illThesaurusSeevariometer
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