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WALLACE D. HAYES

1918–2001

Elected in 1975

“For contributions to the basic understanding of transonic and supersonic flow, and the Hayes equivalence principle for hypersonic similitude.”

BY RONALD F. PROBSTEIN

WALLACE DEAN HAYES, an emeritus professor at Princeton University and one of the world’s leading theoretical aerodynamicists, whose numerous and fundamental contributions to the theories of supersonic and hypersonic flow and wave motion strongly influenced the design of aircraft at supersonic speeds and missiles at hypersonic speeds, died on March 2, 2001, at the age of 82.

Wally was born on September 4, 1918, in Beijing, China, where his father worked as a civil engineer. He came to the United States at the age of 10, settling in California. He received all of his higher education at the California Institute of Technology, from which he was awarded a B.S. in physics, with honor, in 1941, the professional degree Ae.E. in 1943, and a Ph.D. in aeronautics, magna cum laude, in 1947.

His early professional career began as a stress analyst in 1939 with Consolidated Aircraft and continued during World War II as an aerodynamicist with North American Aviation. He joined the Division of Applied Mathematics at Brown University in 1948, which he left in 1952 to become science liaison officer at the U.S. Office of Naval Research in London. Returning to the states in 1954, he became a professor at Princeton University in the Department of Aeronautical



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