Free-Spinning-Tunnel Investigation to Determine the Effect of Two Nose Designs on Spin and Recovery Characteristics of a 1/20-Scale Model of the McDonnel XF3H-1 Airplane: TED No. NACA DE 343 Page: 3 of 15
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.* S
o , of the McDonnell XF3H-1 airplane. Tests performed previously on the
'" model with the original long sharp-pointed nose, installed as reported
* in reference 1, had indicated that use of ailerons might be necessary
in conjunction with rudder reversal to insure recovery. Reference 1
* also indicated a favorable effect on the model when the sharp nose of
* "the fuselage was cut off. Inasmuch as a shorter blunter nose was under
consideration for the production airplane, it was desired to determine
if such a nose installation would give satisfactory recovery by normal
use of controls (full rudder reversal followed by movement of elevator
down).
SYMBOLS
b wing span, feet
S wing area, square feet
* c wing or elevator chord at any station along span
mean aerodynamic chord, feet
x/E" ratio of distance of center of gravity rearward of
leading edge of mean aerodynamic chord to mean
aerodynamic chord
z/E ratio of distance between center of gravity and fuselage
reference line to mean aerodynamic chord (positive
when center of gravity is below fuselage reference line)
m mass of airplane, slugs
Ix, Iy, IZ moments of inertia about X, Y, and Z body axes, respec-
tively, slug-feet2
Ix - inertia yawing-moment parameter
mb
Y - Z I inertia rolling-moment parameter
mb2
Iz - IX inertia pitching-moment parameter
mb211 s ax
NACA RM SL51H21
2
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Wilson, Jack H. Free-Spinning-Tunnel Investigation to Determine the Effect of Two Nose Designs on Spin and Recovery Characteristics of a 1/20-Scale Model of the McDonnel XF3H-1 Airplane: TED No. NACA DE 343, report, August 17, 1951; (https://digital.library.unt.edu/ark:/67531/metadc59026/m1/3/: accessed March 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.