Low-speed Free-flight Stability and Drag Characteristics of Radially Vented ParachutesA drop-test investigation has been conducted to determine the stability and drag characteristics of radially vented (duplex) parachutes. Parachutes of two different designs were tested: a large parachute with high geometric porosity and a small parachute with low geometric porosity designed for the same descent velocity with the same load. The results of the tests show that the large high-porosity duplex parachute was very stable in descent, oscillations averaging about [plus-or-minus]3.40; and the average drag coefficient based on the total canopy area and based on the fabric area alone were approximately 0.38 and 0.55, respectively. The small, low-porosity duplex parachute was also very stable in descent, oscillations averaging about [plus-or-minus]4.50; and the average drag coefficients based on the total canopy area and based on the fabric area alone were approximately 0.62 and 0.79, respectively. The oscillations for the cluster of three solid flat circular parachutes, tested for comparison purposes, were [plus-or-minus]7.10. The average drag coefficients based on the total canopy area and the fabric area alone were approximately 0.64 and 0.65, respectively. |
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... CHARACTERISTICS OF RADIALLY VENTED PARACHUTES by Sanger M. Burk , Jr. Langley Research Center Langley Station , Hampton , Va . AND U.S.A. SPACE ADMINISTRATION 83 NASA TN D - 2271 UNIVERSITY OF ILLINOIS - URBANA THE 3 0112 106684043 APK ...
... CHARACTERISTICS OF RADIALLY VENTED PARACHUTES by Sanger M. Burk , Jr. Langley Research Center Langley Station , Hampton , Va . AND U.S.A. SPACE ADMINISTRATION 83 NASA TN D - 2271 UNIVERSITY OF ILLINOIS - URBANA THE 3 0112 106684043 APK ...
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Sanger M. Burk. LOW - SPEED FREE - FLIGHT STABILITY AND DRAG CHARACTERISTICS OF RADIALLY VENTED PARACHUTES By Sanger M. Burk , Jr. Langley Research Center Langley Station , Hampton , Va . Technical Film Supplement L - 817 available on ...
Sanger M. Burk. LOW - SPEED FREE - FLIGHT STABILITY AND DRAG CHARACTERISTICS OF RADIALLY VENTED PARACHUTES By Sanger M. Burk , Jr. Langley Research Center Langley Station , Hampton , Va . Technical Film Supplement L - 817 available on ...
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... CHARACTERISTICS OF RADIALLY VENTED PARACHUTES By Sanger M. Burk , Jr. Langley Research Center SUMMARY A drop - test investigation has been conducted to determine the stability and drag characteristics of radially vented ( duplex ) ...
... CHARACTERISTICS OF RADIALLY VENTED PARACHUTES By Sanger M. Burk , Jr. Langley Research Center SUMMARY A drop - test investigation has been conducted to determine the stability and drag characteristics of radially vented ( duplex ) ...
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... radially placed vents , and included pocket bands . The latter are small fabric strips attached to the canopy skirt between adjacent skirt sections across the suspension lines ( see ref . 1 for details ) and , in general , improve the ...
... radially placed vents , and included pocket bands . The latter are small fabric strips attached to the canopy skirt between adjacent skirt sections across the suspension lines ( see ref . 1 for details ) and , in general , improve the ...
Common terms and phrases
37.8-foot-diameter duplex parachute Aeronautics and Space approximately 0.38 approximately 0.64 area and based average drag coefficients averaging about 3.40 Burk camera CD,t Center of vent CHARACTERISTICS OF RADIALLY chute cluster of three comparison purposes descent velocity determine the stability Diameter of vent Direction of warp drag coefficients based drag tests Dropline DUPLEX AND CLUSTERED fabric porosity feet filling Film supplement L-817 flat circular parachutes ft sec geometric porosity gore constructed gores of fabric gores of parachute ground stations high-porosity duplex parachutes high-porosity parachutes Langley Research Center large high-porosity duplex low-porosity duplex parachute LOW-SPEED FREE-FLIGHT STABILITY NASA TN oscillations averaging parachute based parachute design parachutes in free RADIALLY VENTED PARACHUTES rate of descent respectively rotated shown in figure solid flat circular Space Administration stability and drag stability characteristics stability tests stable in descent supplement L-817 available tested for comparison three solid flat total canopy area type of parachute types of duplex