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: 3 of 24
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Rocky Mountain area. These operations generally consisted of flights
of short duration at relatively low altitudes above extremely rough
The VGH data for the feeder-line operations are analyzed in this
paper to determine the magnitude and frequency of occurrence of gusts,
gust and maneuver accelerations, and the operating airspeeds and alti-
tudes. The gust and load histories are then compared with those obtained
from representative short-haul and long-haul operations previously reported
(ref. 1 and operation A of ref. 2). V-G data previously obtained from the
feeder-line operation (ref. 3) are also used to supplement the VGH data
in order to obtain an estimate of the overall gust and acceleration history
for the operation.
INSTRUMENTATION AND SCOPE OF DATA
The data were collected with an NACA VGH recorder which is described
in detail in reference 4; The recorder obtains a time-history record of
the indicated airspeed, pressure altitude, and normal acceleration for
each flight of the airplane.
The routes over which the present data were obtained are shown in
figure 1. The relatively short flights and the rough terrain character-
istics for these operations are evident from the figure. The VGH data
represent a total of 1,291 flight hours which include 12.8 hours spent
in check flights. In all, 2,029 flights were made between the individual
stops in figure 1 during the record-collection period (February 1953 to
August 1954) with an average flight duration of 38 minutes.
An examination of the VGH records indicated that the operations were
generally conducted at pressure altitudes ranging from 5,000 to 15,000 feet.
A consideration of the topography covered by the routes, however, indicates
that most of the flights were at altitudes of less than 5,000 feet above
The characteristics of the airplane which are pertinent to the eval-
uation and analysis of the VGH data are described in the following table:
Design gross weight, W, ib .............. .... 25,200
Wing area, S, sq ft ...................... 987
Span, b, ft .... ................. .... . 95
Aspect ratio, A .............. .......... 9.1
Mean geometric chord, c, ft .* * *. . ..... . . 10.4
Slope of lift Lurve, a, per radian (computed from
A+ 2' ' . . . ".. . . " 4.92
NAA TN 3750
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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/m1/3/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.