Airspeedmesser

The Airspeedmesser, often referred to as an airspeed indicator, is a crucial instrument in aviation that measures and displays the speed of an aircraft relative to the surrounding air. It operates by sensing the difference between two pressures: the total pressure (also known as stagnation pressure) and the static pressure. The total pressure is measured by a pitot tube, which faces directly into the oncoming airflow, while the static pressure is measured by static ports, which are typically flush with the aircraft's fuselage.

The difference between these two pressures, known as dynamic pressure, is directly proportional to the square of the aircraft's airspeed. This dynamic pressure is then fed into a mechanism within the airspeedmesser, usually a diaphragm or a bellows, which expands or contracts based on the pressure difference. This movement is mechanically linked to a pointer that indicates the airspeed on a calibrated dial. Modern aircraft often employ electronic airspeed indicators that use pressure transducers to convert the pressure difference into an electrical signal, which is then processed and displayed digitally.

Accurate airspeed measurement is fundamental for safe flight. It is used by pilots to determine takeoff and landing speeds, to maintain proper performance during various flight phases, and to avoid exceeding the aircraft's structural limitations. The airspeed indicator is a primary flight instrument, typically located in the pilot's main instrument panel.