Horizontal-Tail Parameters as Determined From Flight-Test Tail Loads on a Flexible Swept-Wing Jet Bomber Page: 2 of 44
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NACA RM L56J02
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
RESEARCH MEMORANDUM
HORIZONTAL-TAIL PARAMETERS AS DETERMINED FROM FLIGHT-TEST
TAIL LOADS ON A FLEXIBLE SWEPT-WING JET BOMBER
By William S. Aiken, Jr., and Raymond A. Fisher
SUMMARY
An analysis is made of horizontal-tail loads on a flexible multi-
engined jet-propelled swept-wing medium bomber to determine the fol-
lowing horizontal-tail parameters: tail lift-curve slope due to tail
angle of attack CZat, tail lift-curve slope due to elevator deflection
C1g, tail pitching-moment coefficient due to elevator deflection Cmt,
downwash factor d, and the elevator effectiveness factor ; and
ab ae
to determine the centers of pressure of loads due to angles of attack
and elevator deflection. Comparison of the flight-determined parame-
ters with available low-speed wind-tunnel data indicated excellent
agreement, and the locations of the centers of pressure of the loads
were in reasonable agreement with predictions. Least-squares curve-
fitting procedures are used throughout the analysis, and a method is
developed for determining zero shifts for the strain-gage-measured
horizontal-tail loads.
INTRODUCTION
The calculation of aircraft longitudinal stability characteristics
requires reliable estimates for such horizontal-tail parameters as tail
lift-curve slope, elevator effectiveness, downwash factor, and tail
pitching-moment coefficient due to elevator deflection. Recent tests
made by the National Advisory Committee for Aeronautics which included
measurements of horizontal-tail loads and fuselage deflections of a
large flexible airplane permitted the analysis of data from which com-
parisons could be made between low-speed wind-tunnel parameters used in
design and actual values as measured in flight._------J F
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Aiken, William S., Jr. & Fisher, Raymond A. Horizontal-Tail Parameters as Determined From Flight-Test Tail Loads on a Flexible Swept-Wing Jet Bomber, report, January 17, 1957; (https://digital.library.unt.edu/ark:/67531/metadc62879/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.