Correlation of predicted and experimental lateral oscillation characteristics for several airplanes Page: 2 of 34
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iT NACA RM A52J6
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
CORRELATION OF PREDICTED AND EXPERIMENTAL LATERAL
OSCILLATION CHARACTERISTICS FOR
By Donovan R. Heinle and Walter E. McNeill
An investigation of the accuracy of a presently used method for
predicting the dynamic lateral oscillatory characteristics of airplanes
has been made. This study involved the comparison of controls-fixed
flight-test data from several current fighter-type jet airplanes with
the calculated values of period and damping for these airplanes. These
calculations were made from geometric and mass characteristics and aero-
dynamic derivatives derived from geometric characteristics and wind-
For the airplanes included in this investigation, it was found that
the dynamic lateral oscillatory characteristics could be predicted with
reasonable accuracy by use of the geometric and mass characteristics and
static wind-tunnel data. Where discrepancies did exist between experi-
mental and calculated data, they were attributable to control motion or
to parameter inaccuracies in the calculations. It was found that, for
airplanes involving deviations from the conventional configurations,
special techniques for obtaining the dynamic derivatives such as dynamic
wind-tunnel tests are advisable.
With the increasing complexity and cost of the modern airplane, it
becomes desirable to predict as far as possible in advance of its com-
pletion approximately what the flight stability characteristics will be.
us any expec e sciences may be note aan e -poss ble correctio
may be applied early in the development and construction of the airplane
to minimize time loss and expense. The extension of flight to the higher \
altitudes and speeds experienced in recent years has made it an increas-
ingly greater problem to produce aircraft that perform within the limits
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Heinle, Donovan R. & McNeill, Walter E. Correlation of predicted and experimental lateral oscillation characteristics for several airplanes, report, December 15, 1952; (https://digital.library.unt.edu/ark:/67531/metadc59423/m1/2/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.