air-speed indicator (ASI)

An instrument to measure the speed of relative airflow. Pitot pressure (i.e., dynamic and static pressure) is taken into a capsule kept in an airtight case. Static pressure is fed into the case. The capsule is thus affected by dynamic pressure only. This is designated as indicated air speed through a system of gears.

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References in periodicals archive

This process has included tracking down from specialist suppliers a genuine WWI air-speed indicator, altimeter, engine tachometer, spirit level, watch and floor-mounted compass to make up the control panel.

Making history: it's been a labour of love for family reasons, but a project to reproduce the WWI Bristol Scout aircraft also has great historical significance

* Standby instruments: air-speed indicator, altimeter, engine performance indicators, radio frequency indicator and rate-of-climbindicator are being jointly developed by Sextant and VDO.

The Tiger cockpit consortium: who makes what

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