Computation of Hinge-Moment Characteristics of Horizontal Tails from Section Data Page: 2 of 34
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NACA 0B No. 5B05
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
COMPUTATION OF HINGE-MCMENT CHARACTERISTICS
OF HORIZONTAL TAILS FROM SECTION DATA
By Robert M, Crane
A study of data from various wind-tunnel tests of hori-
zontal tail surfaces was made to determine the accuracy with
which section data can be used to estimate the hinge-moment
characteristics of control surfaces of finite span. The study
consisted of a comparison between the variation of elevator
hinge moments with elevator deflection and with airplane pitch-
ing moment, as estimated from data obtained in two-dimensional
flow, and that variation measured experimentally on 16 differ-
ent horizontal tails mounted on wind-tunnel models of complete
airplanes. The method used in applying section data to the
evaluation of three-dimensional characteristics is outlined,
and summary curves showing the variation of the major param-
eters with control-surface chord, balance chord, and trailing-
edge angle are presented. It is demonstrated that the three-
dimonsional hinge-moment characteristics of tail surfaces can
be derived from existing section data with an accuracy which
is within the tolerance required in preliminary design.
Considerable data on the characteristics of large-chord
flaps have been obtained (references 1 to 11), which establish
the effect of the major variables (flap chord, balance chord,
nose shape, nose gap, etc.) on the section aerodynamic charac-
teristics of airfoils. The question has arisen on occasion,
as to the degree of accuracy with which these data can be
applied to the estimation of the characteristics of control
surfaces in three-dimensional flow. This question is partic-
ularly pertinent as applied to the horizontal or vertical
tail surfaces of complete airplanes, since these surfaces
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Crane, Robert M. Computation of Hinge-Moment Characteristics of Horizontal Tails from Section Data, report, April 1, 1945; (digital.library.unt.edu/ark:/67531/metadc62480/m1/2/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.