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A dial reading feet per minute up or down from a centre zero.
Also known as: VSI, Rate of climb indicator, Dial with up and down scales, Climb and descent rate dial
The vertical speed indicator reads rate of climb or descent, and it lags — it works from a calibrated leak in a sealed case, so it takes several seconds to settle after a change. A pilot who chases it will oscillate, which is why it is a trend instrument rather than a control one.
Denotes the instrument indicating rate of climb or descent, reading in feet or metres per minute from a centre zero.
Contexts: Vehicle dashboard
Lags behind actual vertical movement by several seconds because it measures pressure change through a calibrated leak, so it is used as a trend rather than a control instrument.
Contexts: Vehicle dashboard
Reads zero in level flight regardless of altitude, since it responds to change rather than to absolute pressure.
Contexts: Vehicle dashboard
A circular dial with a single needle at a centre-left zero, graduated upward for climb and downward for descent in thousands of feet per minute.