Measurement of the Moments of Inertia of Full Scale Airplanes Page: 2 of 18
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a NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TEO1BIIOAL IOTE N0. 265.
MEASURUM~ T OF THE MOMENTS OF INERTIA OF FULL SCALE AIRPLANES.
By M. W. Green.
This paper contains a descriptibn of the method of measuring
the moments of inertia of full scale airplanes as practiced by
the National Advisory Committee for Aeronautics at the Langley
Memorial Aeronautical Laboratory. The method, while not at all
new, is published for the information and guidance of others who
may desire to make similar measurements. The paper includes as
an appendix the computations for the moments of inertia of the
In the study of spinning flight, particularly uncontrollable
spins, it has become increasingly evident that a knowledge of the
precessional forces due to mass distribution of the airplane is
very necessary. At present there is a conspicuous lack of infor-
mation on the mass distribution of contemporary airplanes. With
a view to obtaining authoritative data on this the National
Advisory Committee for Aeronautics has established the practice
of measuring the moments of inertia of all airplanes that pass
through any flight tests at the laboratory. It is impossible
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Green, M. W. Measurement of the Moments of Inertia of Full Scale Airplanes, report, September 1927; (digital.library.unt.edu/ark:/67531/metadc59676/m1/2/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.