Cloyce E. Matheny
naca-tn-2103
May 1950
Existing flight-test data on pitching angular accelerations have been compiled. The sources from which the data were taken were manufacturer's reports, NACA papers, and unpublished tests which were conducted at the Langley Aeronautical Laboratory.
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http://naca.central.cranfield.ac.uk/reports/1950/naca-tn-2103.pdf