Pitot System
Bernoulli's principle states that total pressure (or stagnation pressure) is constant along a streamline. There is no variation in stagnation pressure, regardless of the position on the streamline where it is measured. There is no position error associated with stagnation pressure.
The Pitot tube supplies pressure to the airspeed indicator. Pitot pressure is equal to stagnation pressure providing the Pitot tube is aligned with the local airflow, it is located outside the boundary layer, and outside the wash from the propeller. Pitot pressure can suffer alignment error but it is not vulnerable to position error.
Read more about this topic: Position Error
Famous quotes containing the word system:
“... the yearly expenses of the existing religious system ... exceed in these United States twenty millions of dollars. Twenty millions! For teaching what? Things unseen and causes unknown!... Twenty millions would more than suffice to make us wise; and alas! do they not more than suffice to make us foolish?”
—Frances Wright (1795–1852)