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We have seen that the VSI capsule will respond to altitude rate changes by expanding and contracting. This movement is transmitted to the VSI pointer via levers and gears, the ratios of which are carefully matched to the deflection characteristics of the capsule to ensure the accuracy of the instrument.
A much simplified animation below should help you to understand this process.
You should now understand the basic principles of a simple VSI. The following pages will examine an actual VSI in a more detail.
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| VSI Principles 2 | The Vertical Speed Indicator | A Typical VSI | |||