Wind-Tunnel Investigation of the Opening Characteristics, Drag, and Stability of Several Hemispherical Parachutes Page: 3 of 25
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2 CONFIDENTIAL NACA RM No, LJO7a
The present tests were made with six additional types of Baseball
parachutes, furnished the NACA by General Textile Mills, Inc., to supply
more information regarding the principal design variables that influence
their opening characteristics. Some of these parachutes were constructed
with low-porqsity material in the canopy area just above the hem line,
a feature which, it had been indicated in reference i, would affect
opening characteristics favorably. Each of the hemispherical parachutes
differed somewhat in design and an attempt was made to evaluate generally
the effects of shroud-line length, fabric porosity and weight, and hem-
line construction upon opening characteristics. Tests were also made to
determine the effects of some of these design variables on the drag and
stability characteristics of the hemispherical parachutes.
Motion pictures of the opening characteristics of the parachutes
were obtained during the tests and are available for loan upon request
from NACA Headquarters, Washington, D. C.
L length of parachute shroud lines, feet
D projected hemispherical diameter of parachute, feet
q dynamic pressure, pounds per square foot pv2)
V airspeed,. feet per second
p density of air, slugs per cubic foot
S projected area of parachute, square feet
CD drag coefficient of parachute ( SDrag
Tests to determine the opening characteristics of the various
hemispherical parachutes were made in the Langley 300 MPH 7- by 10-foot
tunnel, which is an atmospheric horizontal wind tunnel. Tests to
determine the drag and stability characteristics of the parachutes were
made both in the Langley 300 MPH 7- by 10-foot tunnel and in the
Langley 20-foot free-spinning tunnel. The Langley 20-foot free-spinning
tunnel is a vertical atmospheric wind tunnel with a vertically rising
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Scher, Stanley E. & Gale, Lawrence J. Wind-Tunnel Investigation of the Opening Characteristics, Drag, and Stability of Several Hemispherical Parachutes, report, October 7, 1948; (https://digital.library.unt.edu/ark:/67531/metadc65438/m1/3/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.