The speed of an aircraft through the air determines its performance in many ways. Source: cometaviationsupplies.co.za How does the indicator work? A basic airspeed indicator is a mechanical device that compares pressure from the pitot tube to pressure from the static port. The static port is… Read more: https://schaeferflight.com/index.php/2018/03/20/flight-instruments-airspeed-indicator/