From the plaque:
This plaque at Shafter Airport
commemorates the world's first man-powered flight to complete
the Kremer Circuit, August 23, 1977. The circuit, a figure
eight around two pylons one-half mile apart, was completed
in six minutes, twenty-two seconds. The plane was designed
by Dr. Paul MacCready, Jr. and flown by Bryan Allen. A
cash prize of 50,000 pounds was awarded by the Royal Aeronautical
Society, London, England.
Plaque placed by the State Department of Parks and Recreation in cooperation with the Kern County Museum, Kern County Department of Airports, and Kern County Historical Society, February 24, 1979.