The operating principle of the vertical speed indicator is based on the measurement of the rate of change of…
The VSI consists of a static pressure line feeding static pressure to an aneroid capsule (vacuum) and a metering unit. The metering unit is a small tube with a narrow opening restricting the flow of static pressure to the instrument case. As the aircraft initiates a climb, the pressure inside the aneroid capsule will immediately change its form, whereas the static pressure in the instrument case will change with a slight delay as the metering unit restricts the flow. This lag results in a differential pressure, which will be displayed on the dial of the VSI as a rate of climb/descent.
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