| The phenomenon of abrupt and large change in normal force occuring at some high, critical incidence on low-aspect ratio plates have practical applications, e.g. as missile wings and control surfaces, shiprudders, heliostats, and antennas. This change in normal force at high incidence has its origin in a change of the flow field.;The flow visualization tests in the wind tunnel led to a conjectured, complex flow pattern on the suction side of the plate. The experiments using the electromagnetic analogy, and the results of theoretical modelling of the flow supported the conjectured flow pattern and gave additional information about the relative vortex strengths of the vortex configuration. On the pressure side of the plate, the surface flow visualization tests revealed a degenerate node.;A flat, square, sharp-edged plate was investigated in low-speed flow at subcritical incidence (i.e. |
