Airplanes in horizontal curvilinear flight Page: 2 of 26
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECHNICAL NOTE NO' 174.
AIRPLANES IN HORIZOn'TaL CUfVILINEAR FLIGHTq*
By Heinrich Kain.
War airplanes require not only high speed and the ability
to climb rapidly, but also the ability to traverse sharp curves
quickly. An attempt is made, in the following note, to give a
simple method of calculating horizontal curvilinear flight. A
method for determining the area of the aileron and rudder sur-
faces will also be indicated. The following discussion applies-.-
primarily to single and two-seater airplanes, although it can
be extended to larger airplanes.
Horizontal Curvilinear Flight.- Two conditions must be dis-
tinguished in connection with flight on.a horizontal turn, viz.,
circular and spiral flight. While circular flight can be main-
tained continuously, spiral flight forms a transition between
two circular flights. Between rectilinear flight, which may be
considered as flight in a circle of infinite radius, and the
smallest circle in which the airplane can fly, circular flights
of any desired radius can be flown. The most important equilib-
rium condition to be observed, in connection with flight in a
circle, is that the air resistance must be overcome by the pro-
peller thrust.. p(
S-* From Technische Berichte, Volume III, No.7, pp. 260-267. (1918).
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Kann, Heinrich. Airplanes in horizontal curvilinear flight, report, January 1924; (https://digital.library.unt.edu/ark:/67531/metadc53837/m1/2/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.