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Vibration characteristics of a steadily rotating slender ring

Lallman, Frederick J., author.
[Washington, D.C.] : National Aeronautics and Space Administration, Scientific and Technical Information Branch, December 1980. 1980-

Weight and balance for the Airmass Incorporated Sunburst Model C ultralight

Roskam, Jan, 1930- author.
Lawrence, Kansas : Flight Research Laboratory, University of Kansas Center for Research, Inc. ; [Hampton, Va.] : National Aeronautics and Space Administration, Langley Research Center, November 1983. 1983-