Supplementary Investigation in the Langley 20-Foot Free-Spinning Tunnel of the Spin and Recovery Characteristics of a 0.057-Scale Model of the Chance Vought XFU-1 Airplane, Ted No. NACA DE 311 Page: 3 of 23
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. INTRODUCTION
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OS
S
S.
A letter from the contractor reported that in the course of flight
* testing the Chance Vought XFU-1 airplane, it was found that the varia-
0: tion of yaw angle with rudder angle was greater than desirable.
Several remedies were proposed for this condition, including a reduo-
tion in the maximum rudder deflection from 250 to 150, reducing the
rudder span by fixing the portion of the rudder below the wing at
neutral, or linking the original rudders to move differentially. In
addition, horn balances have been incorporated on the rudders. The
Bureau of Aeronautics, Department of the Navy, requested that the NACA
determine the effect of these proposed changes on the spin and recovery
characteristics of the XF7U-1 airplane. The spin and recovery charac-
teristics of the XFTU-1 in the original configuration were reported in
reference I.
Tests were made with the original rudders with deflections of 250
and 150, with the reduced-span rudders with deflections of 250
and 150, and with the original rudders differentially linked with
maximum deflections of 250 and 15. The model was reballasted to
correspond with the latest information concerning weight, center-of-
gravity location, and moments of inertia, the new loading being quite
similar to that of the original tests.
SYMBOLS
b wing span, feet
S wing area, square feet
c wing or elevator chord at any station along the span
' mean aerodynamic chord, feet
x* ratio of distance of center of gravity rearward of leading
edge of mean aerodynamic chord to mean aerodynamic chord
z/fW ratio of distance between center of gravity and root chord
line to mean aerodynamic chord (positive when center of
gravity is below root chord line)
m mass of airplane, slugs
Ix, ly, Iz moments of inertia about I, Y, and Z body axes, respec-
tively, slug-feet22
NACA RM SLH30a
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Berman, Theodore. Supplementary Investigation in the Langley 20-Foot Free-Spinning Tunnel of the Spin and Recovery Characteristics of a 0.057-Scale Model of the Chance Vought XFU-1 Airplane, Ted No. NACA DE 311, report, 1948; (https://digital.library.unt.edu/ark:/67531/metadc64760/m1/3/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.