Control-Motion Studies of the PBM-3 Flying Boat in Abrupt Pull-Ups Page: 2 of 69
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MFJMORANDM REPORT
for
Army Air Forces, Materiel Command
and
Bureau of Aeronautics, Navy Department
CONTROL-MOTION STUDIES OF THE PBM-3 FLYING BOAT
TIN ABRUPT PULL-UPS
By Henry A. Pearson and Leland K. Smull
INTRODUCT ION
For some time it has been felt that the strength
requirements of control surfaces should be placed on a more
rational basis and that they should in some manner be related
to the acceleration, rolling, and yawing performance required
of the airplane on which they are installed. Due to the
fact that existing requirements were easily applied and few
failures of control surfaces had occurred until recently.
the rational methods, although they were available, were not
used. This was in part due to the fact that they were, in
general, too long and, in addition, that the critical types
of control motion were not known.
Recent failures in which both the horizontal and vertical
tail surfaces were apparently involved have resulted in a
desire ,to use the more rational methods in spite of the extra
work that will be necessary. A first step, that of simpli-
fying the theoretical methods as much as possible, has
already been undertaken (reference i). So far the resultshave been confined to horizontal tail, and they show, as
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Pearson, Henry A. & Smull, Leland K. Control-Motion Studies of the PBM-3 Flying Boat in Abrupt Pull-Ups, report, November 1942; (https://digital.library.unt.edu/ark:/67531/metadc60908/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.