WInd-tunnel Investigation of the Opening Characteristics, Drag, and Stability of Several Hemispherical Parachutes PDF Download
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Author: Stanley H. Scher Publisher: ISBN: Category : Drag (Aerodynamics) Languages : en Pages : 34
Book Description
An investigation has been conducted to determine the opening characteristics of several hemispherical parachutes and to study the influence of the parachute design variables on these opening characteristics. The effects of design variables on the drag and stability characteristics of the parachutes were also evaluated.
Author: Stanley H. Scher Publisher: ISBN: Category : Drag (Aerodynamics) Languages : en Pages : 34
Book Description
An investigation has been conducted to determine the opening characteristics of several hemispherical parachutes and to study the influence of the parachute design variables on these opening characteristics. The effects of design variables on the drag and stability characteristics of the parachutes were also evaluated.
Author: Sanger M. Burk Publisher: ISBN: Category : Aerodynamics, aircraft Languages : en Pages : 24
Book Description
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.
Author: Paul J. Carpenter Publisher: ISBN: Category : Helicopters Languages : en Pages : 642
Book Description
The rotor system investigated is a servocontrol type with blades fastened rigidly at the hub and twisted outboard by auxiliary airfoils called flaps to obtain pitch control.
Author: James T. Foughner Publisher: ISBN: Category : Aerodynamics, Transonic Languages : en Pages : 44
Book Description
Transonic wind-tunnel studies were conducted with modified cross, hemisflo, and disk-gap-band parachute models in the wake of a cone-cylinder shape forebody. The basic cross design was modified with the addition of a circumferential constraining band at the lower edge of the canopy panels. The tests covered a Mach number range of 0.3 to 1.2 and a dynamic pressure range from 479 Newtons per square meter to 5746 Newtons per square meter. The parachute models were flexible textile-type structures and were tethered to a rigid forebody with a single flexible riser. Different size models of the modified cross and disk-gap-band canopies were tested to evaluate scale effects. Model reference diameters were 0.30, 0.61, and 1.07 meters (1.0, 2.0, and 3.5 ft) for the modified cross; and nominal diameters of 0.25 and 0.52 meter (0.83 and 1.7 ft) for the disk-gap-band; and 0.55 meter (1.8 ft) for the hemisflo. Reefing information is presented for the 0.61-meter-diameter cross and the 0.52-meter-diameter disk-gap-band. Results are presented in the form of the variation of steady-state average drag coefficient with Mach number. General stability characteristics of each parachute are discussed. Included are comments on canopy coning, spinning, and fluttering motions.
Author: Stanley H. Scher
Author: Stanley H. Scher
Author: Stanley H. Scher
Author: George M. Ware
Author: James Matthew Cunnington
Author: Nickolai Charczenko
Author: Sanger M. Burk
Author: United States. National Advisory Committee for Aeronautics
Author: 
Author: Paul J. Carpenter
Author: James T. Foughner