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instant rate of climb indicator

instant rate of climb indicator (IVSI)

instant rate of climb indicator (IVSI)click for a larger image
A form of vertical speed indicator that uses internal accelerometer-type air pumps to overcome the inherent lag of a conventional VSI (vertical speed indicator). This instrument thus indicates a more instantaneous indication of vertical speed.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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