Definition of Calibrated Orifice
A calibrated orifice is a small aperture with a precise diameter that is used to slow down the change in pressure in a vertical speed indicator. The purpose of the orifice is to introduce a delay in the pressure change, allowing for more accurate measurement of vertical speed as opposed to sudden and drastic fluctuations in pressure.
The calibrated orifice is typically located within the pitot-static system, which measures air pressure to determine an aircraft’s altitude and airspeed. Vertical speed indicators rely on precise pressure measurements to calculate changes in altitude, and sudden changes in pressure can result in inaccurate readings.
The use of a calibrated orifice helps to minimize the impact of sudden pressure changes, allowing for a more reliable and accurate measurement of vertical speed. This is particularly important for pilots during takeoff and landing when precise navigation is crucial.
Overall, the calibrated orifice plays a critical role in the functioning of a vertical speed indicator and the safe operation of an aircraft. Its precise sizing and location ensure that pressure changes are delayed in a controlled and measured way, ultimately providing pilots with reliable and accurate readings of vertical speed.
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