Alfred Gessow, a prominent researcher and educator in the field of helicopter aerodynamics, died May 2 at a Birmingham, Ala., hospital, while under treatment for a heart condition. He was 79. Gessow coauthored the classic textbook in the field, ``Aerodynamics of the Helicopter,'' which is still in print and widely used 50 years after it first appeared. Gessow joined NACA in 1944, conducting helicopter research, and remained with its successor NASA to manage programs and become director of ...

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