Definition

Noun: A pitot-static tube is a measuring instrument that combines a Pitot tube and a static tube. It is used to determine fluid flow velocity, most commonly airspeed in aviation, by measuring the difference between total pressure (also called stagnation pressure) and static pressure.

Usage

The pitot-static tube is a critical sensor in aviation. * The aircraft's airspeed indicator receives its data from the pitot-static tube. * Before flight, the pilot must check that the pitot-static tube is not blocked by ice or insects. * Accurate airspeed measurement depends on a properly functioning pitot-static tube.

Advanced Usage

• Principle of Operation: The pitot-static tube works based on Bernoulli's principle. The Pitot tube opening faces the airflow to measure total pressure, while the static ports on the side measure the ambient static pressure. The difference between these two pressures is dynamically translated into indicated airspeed.
• System Integration: The pitot-static tube is a key part of the aircraft's pitot-static system, which also includes the altimeter and the vertical speed indicator.

Variants and Related Words

• Pitot tube: A tube with an open end pointed into a fluid flow, used to measure the total pressure. It is a component of the pitot-static tube.
• Static port: An opening on the aircraft's fuselage used to measure ambient static air pressure. On many aircraft, these are separate from the Pitot tube, but they are integrated into a single unit in a pitot-static tube.

Synonyms

• Pitot probe: A common synonym in aviation terminology.
• Airspeed probe: A descriptive synonym highlighting its primary function.

Related Phrases

• Pitot-static system: The complete system of instruments (airspeed indicator, altimeter, vertical speed indicator) that relies on pressure measurements from the pitot-static tube and static ports.
• Pitot heat: An electrical heating element for the pitot-static tube to prevent ice accumulation, which is crucial for flight safety.

Noun

1. measuring instrument consisting of a combined Pitot tube and static tube that measures total and static pressure; used in aircraft to measure airspeed