Travel of the center of pressure of airfoils transversely to the air stream Page: 2 of 20
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NATIONAL ADVISORY C0IOITTEE FOR AERONAUTICS.
TECHNICAL MEMORANDUM NO. 530.
TRAVEL OF THE CENTER OF PRESSURE OF AIRFOILS
TRANSVERSELY TO THE AIR STREAM.*
By Richard Katzmayr.
Knowledge of the resultant direction of the air force to
the wing section is a prerequisite for airplane stability calcu-
lations. It is also indispensable for the distribution of the
load on the different members of the wing structure. Since air-
plane wings have a limited span, a knowledge of the distribution:
of the air forces along the span is a second prerequisite, in
addition to a knowledge of the pressure distribution along the
chord. For' the condition of minimum drag, the distribution.
along the span is-elliptical. Tests with models and with full-..
sized wings show, however, that the elliptical distribution is
rarely attained, the pressure distribution generally decreasing
more gradually.toward the wing tips, particularly at large an-
gles of attack.
The experiments here described were performed for the pur-
pose of obtaining the essential facts concerning the distribu-
tion of the air force along the span. We did not follow, how-
ever, the time-consuming method of point-to-point measurements
.*"Druckpunktswanderungen bei Flugeln quer zur. Stromrichtung."
From Berichte der Aeromechanischen Versuchsanstalt in Wien,
Vol. I, No. 1 (1928), pp. 47-57.
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Katzmayr, Richard. Travel of the center of pressure of airfoils transversely to the air stream, report, September 1, 1929; (digital.library.unt.edu/ark:/67531/metadc277471/m1/2/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.