Abstract
Equations are presented for calculating the gust velocity along the landing flight path of an airplane due to the presence of wind shear. Based on this gust input data, airplane equations of motion are solved to determine the minimum airspeed developed during trimmed flight along the landing flight path. Using the developed gust equations, it is shown that the use of a tilted vortex pair provides an improved agreement with measured wind shear velocities. Here, a longitudinal velocity ratio is defined along with a selected vortex core radius. The nonlinear gust velocities are then approximated by a broken line linear ramp gust to use as input gust data for the airplane equations of motion. From this, the minimum airspeed is found along with the flight-path position.
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