Question

The indicated airspeed S (in knots) of an airplane is given by an airspeed indicator that measures the difference p (in inches of mercury) between the static and dynamic pressures.

The relationship between S and p can be modeled by S=136.4p√+4.5.

Find the change in the differential pressure of an airplane that was traveling at 218 knots and slowed down to 195 knots.

Answer 1

The change in the differential pressure of the airplane as it slows down from 218 knots to 195 knots is approximately 0.499 inches of mercury.