Measurements of the pressure distribution on the horizontal-tail surface of a typical propeller-driven pursuit airplane in flight I: effects of compressibility in steady straight and accelerated flight Page: 3 of 78
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, , NACA TN No. 1144
right tail moved inboard of the calculated value. The calculated asym-
metric loads and fuselage torsional moments were conservative as compared
with the experimental values. The specified chordwise distribution of
the balancing.tail loads: dcer the horizontal-tail surface was considera-
bly in error under certain conditions, because.the. actual section angle
of attack (contrary to what was assumed) was not constant across the
tail span, and because the elevator angle was not taken into account in
distributing the chordVWie load's.
Structural failures of the horizontal-tail surfaces of -high-speed
military aircraft have, occurred recdhtly; raising the question of
whether current design reguirementS ard adequate for predicting the max-
imum horizobntal-tail loads that are likely to be encountered in flight.
To provide data as a basis for possible revision of -exiting design
requirements, pressure-distribution measurements were made on the
horizontal-tail surface of. a representative pursuit-,type airplane during
various types of maneuvers in.which it tWas thought critical loading con-
ditions on the tail might be obtained..
This~report, the first of. several..reports on horizontal-tail loads
in steady straight and aboelerateo flight, sideslips, and .abrupt maneu-
vers, covers the tail loads in steady straight and.accelerated flight
over a range of speed~, including those whore compressibility effects
may become important. The .tail loading calculated accbrding to slightly
modified, current desigh requirements is compare. with the experimental
results, and an attempt is made to point out where and why the applica-
tion of these requirements results in failure of the designer to predict
the actual loads and their distribution over the horizontal-tail surface.
The Symbols used in this report are as follows:
bt horizontal-tail span,.feet
Mr root bending moment. (positive when clockwise as seen from the rear),
c local tail chord, feet "
b wing mean aerodynaic chord, feet
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Sadoff, Melvin; Turner, William N. & Clousing, Lawrence A. Measurements of the pressure distribution on the horizontal-tail surface of a typical propeller-driven pursuit airplane in flight I: effects of compressibility in steady straight and accelerated flight, report, July 1947; (digital.library.unt.edu/ark:/67531/metadc55030/m1/3/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.