An analysis of airspeed, altitude, and acceleration data obtained from a twin-engine transport airplane operated over a feeder-line route in the Rocky Mountains Page: 2 of 24
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TECH LIBRARY KAFB, NU
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NATIONAL ADVISORY COITTEE FOR AERONAUTICS 0 0 6 6 2 7 5
TECHNICAL NOTE 3750
AN ANALYSIS OF AIRSPEED, ALTITUDE, AND ACCELERATION DATA
OBTAINED FROM A TWIN-ENGINE TRANSPORT AIRPLANE
OPERATED OVER A FEEDER-LINE ROUTE IN TE ROCKY MOUNTAINS
By Martin R. Copp and Mary W. Fetner
Time-history data of airspeed, altitude, and acceleration obtained
with the NACA VGH recorder from a twin-engine airplane operated by a
regional feeder airline in the Rocky Mountains are evaluated to determine
the magnitude and frequency of occurrence of gusts and gust accelerations
and the operating airspeeds and altitudes. The results obtained are
compared with the results previously obtained from a representative short-
haul and long-haul operation.
The larger amount of turbulence at the low operating altitudes over
the mountainous terrain resulted in a higher frequency of occurrence of
gusts of small intensity for the feeder-line operation than for the other
operations. The gusts of larger intensity were more frequent for the
short-haul and long-haul operations. The differences in the gust-load
factors for the operations appeared to be a direct reflection of the gust
intensities in that the small load factors were more frequent for the
feeder-line operation, whereas the larger values were less frequent than
those for the short-haul and long-haul operations.
Data have been collected for a number of years by the National
Advisory Committee for Aeronautics with the NACA V-G and VG2 recorders
in a continuing study of the gusts and gust accelerations experienced by
commercial transport airplanes. This information has proven useful in
the formulation of design requirements, in the study of fatigue problems,
and in the prediction of gust and gust load histories for new types of
operations. Most of these data have been obtained from the long-haul
types of operations on domestic and transoceanic routes. No informa-
tion has been obtained to date from the so-called regional or feeder-
line types of operation. In order to sample these types of opera-
tions, VGH data have been obtained from feeder-line operations in the
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Copp, Martin R. & Fetner, Mary W. An analysis of airspeed, altitude, and acceleration data obtained from a twin-engine transport airplane operated over a feeder-line route in the Rocky Mountains, report, October 1956; (https://digital.library.unt.edu/ark:/67531/metadc56182/m1/2/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.