Low-speed Free-flight Stability and Drag Characteristics of Radially Vented Parachutes
A 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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17.0 Parachute type Aeronauics and Smce approwmately 002 approximately 0.38 area and based available on request average drag coefficients avereging abou 70..4 Burk camera CHARACTERISTICS OF RADIALLY chute cluster of three clustered parachutes descent velocity determine the stability DRAG CHARACTERISTICS drag tests dreg coefficients bared Dropline DUPLEX AND CLUSTERED duplex parachute showing ea0h fabric porosity feet filling Film supplement L-817 flat circular parachutes geometric porosity gore constructed gores of fabric gores of parachute high-porosity duplex parachutes high-porosity parachutes Langley Research Center large high-porosity low-porosity duplex parachutes LOW-SPEED FREE-FLIGHT STABILITY Ob0rver opening shock loads oscillations arereging abou oscillations averaging parachute based parachute design PARACHUTES By Sanger RADIALLY VENTED PARACHUTES rate of descent resmct0.el rotated shown in figure Smce Admincttration solid flat circular stability and drag stability characteristics stable in descent supplement L-817 available tested f commriwn tests the payload three solid flat total canopy area type of parachute types of duplex