Download or read book Investigation of Steady State Performance of Personnel Parachutes Using Scale Model Wind Tunnel Testing written by Justin Barber and published by . This book was released on 2001 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Investigation of Personnel Parachute Designs Using Scale Model Wind Tunnel Testing written by Justin Barber and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wind tunnel Tests of Modified Cross Hemisflo and Disk gap band Parachutes with Emphasis in the Transonic Range written by James T. Foughner and published by . This book was released on 1974 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Effects of Flexibility on the Steady State Performance of Small Ribbon Parachutes written by Terry Weber and published by . This book was released on 1981 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small textile ribbon parachute models were shown to exhibit steady-state aerodynamic coefficients similar to those of rigid parachute models. Since no detalied study of the effects of model flexibility on the steady-state aerodynamic performance of a parachute model has been reported, several ribbon parachute models of varying flexibility and equal geometric porosity were constructed and tested in the wind tunnel. No correlation was found between model flexibility and measured aerodynamic performance.

Download or read book Wind tunnel Investigation of Drag and Stabili Ty of Parachutes at Supersonic Speeds written by Nickolai Charczenko and published by . This book was released on 1964 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Drag and Dynamics of Single and Clustered Parachutes in Freestream and with Wake and Ground Effects written by Helmut G. Heinrich and published by . This book was released on 1966 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of wind tunnel studies concerned with transient and steady state performance of single and clustered parachutes in cargo extraction systems are presented. In Part 1, circular flat and ringslot canopies singly suspended and in clusters of 2, 3, and 4, were deployed in freestream, in the wake of an aircraft, and near a simulated ground. As a further means of analysis, wake pressure surveys were performed on the DHC-4 Caribou and the C-130 Hercules aircraft and are presented in Part 2.

Download or read book Wind tunnel Investigation of Inflation of Disk gap band and Modified Ringsail Parachutes at Dynamic Pressures Between 0 24 and 7 07 Pounds Per Square Foot written by Charles H. Whitlock and published by . This book was released on 1969 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exploratory wind-tunnel tests of the disk-gap-band and modified ringsail parachute configurations have been conducted at dynamic pressures between 0.24 and 7.07 lb/ft2 (11 and 339 N/m2). Both parachutes exhibited positive inflation characteristics over the range of the tests within technique limitations. The disk-gap-band configuration required less time and distance to inflate than the modified ringsail configuration did.

Download or read book Aerodynamics of the Para sail written by Edwin D. Vickery and published by . This book was released on 1965 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is the objective of this report to review certain steady state aerodynamic characteristics of the Para-Sail parachute obtained from full scale drop tests (Ref 1), and from small scale wind tunnel studies (Ref 2 to 5). A correlation is made between the wind tunnel and drop test data, to determine what differences exist, if any, between these two modes of experimentation. Also, in conclusion, an evaluation is made of the performance characteristics of the Para-Sail.

Download or read book Transonic Wind tunnel Tests of a Lifting Parachute Model written by and published by . This book was released on 1976 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Flexibility on the Steady state Performance of Small Ribbon Parachute Models written by T. Weber and published by . This book was released on 1981 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small textile ribbon parachute models were shown to exhibit steady-state aerodynamic coefficients similar to those of rigid parachute models. Since no detailed study of the effects of model flexibility on the steady-state aerodynamic performance of a parachute model has been reported, several ribbon models of varying flexibility and equal geometric porosity were constructed and tested in the wind tunnel. No correlation was found between model flexibility and measured aerodynamic performance.

Download or read book WInd tunnel Investigation of the Opening Characteristics Drag and Stability of Several Hemispherical Parachutes written by Stanley H. Scher and published by . This book was released on 1949 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A New Approach to the Determination of the Steady state Inflated Shape and Included Volume of Several Parachute Types written by William P. Ludtke and published by . This book was released on 1969 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new approach is presented to obtain the steady-state inflated shape of the gore mainseam and the canopy volume of flat circular, 10 percent extended skirt, elliptical, hemispherical, 16 percent porous ring slot, 24 percent porous ribbon in 12- and 16-gore configurations and cross-type parachutes. The canopies are demonstrated to closely elliptical in cross section. The axis ratios of the ellipses are derived from photographic coverage of wind-tunnel tests of models of each type of parachute. Wind-tunnel tests were conducted at various velocities from 17 mph to 200 mph using flat parachute models of approximately 40-inch diameter and shaped gore models of approximately 26-inch inflated diameter. Axis ratios, scale factors, and methods of computing the coordinates of the inflated canopy shape are presented. A new approach to the steady-state volume of the parachute, which includes the volume of the billowed gore and an air volume ahead of the skirt hem of the canopy, is given. The results of this investigation are particularly applicable to studies of canopy stress analysis and determination of the volume of air, which must be collected during canopy inflation process for use in the calculation of opening-shock force. (Author).

Download or read book Calculated Values of Transient and Steady State Performance Characteristics of Man carrying Cargo and Extraction Parachutes written by Eugene L. Haak and published by . This book was released on 1966 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Opening shock, snatch forces, opening times, rates of descent, and down times of a number of man-carrying, cargo, and extraction parachutes are calculated on the basis of analytical equations and certain other assumptions. Comparisons of the calculated data with full scale experimental values are somewhat limited, but show reasonable agreement when available. This report represents a first step in an attempt to catalog full scale experimental values from which, eventually, more exact analytical methods can be derived.

Download or read book Wind tunnel Investigation of the Static Aerodynamic Characteristics of a Multilobe Gliding Parachute written by George M. Ware and published by . This book was released on 1968 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Speed Wind Tunnel Testing written by Jewel B. Barlow and published by John Wiley & Sons. This book was released on 1999-02-22 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brand-new edition of the classic guide on low-speed wind tunnel testing While great advances in theoretical and computational methods have been made in recent years, low-speed wind tunnel testing remains essential for obtaining the full range of data needed to guide detailed design decisions for many practical engineering problems. This long-awaited Third Edition of William H. Rae, Jr.'s landmark reference brings together essential information on all aspects of low-speed wind tunnel design, analysis, testing, and instrumentation in one easy-to-use resource. Written by authors who are among the most respected wind tunnel engineers in the world, this edition has been updated to address current topics and applications, and includes coverage of digital electronics, new instrumentation, video and photographic methods, pressure-sensitive paint, and liquid crystal-based measurement methods. The book is organized for quick access to topics of interest, and examines basic test techniques and objectives of modeling and testing aircraft designs in low-speed wind tunnels, as well as applications to fluid motion analysis, automobiles, marine vessels, buildings, bridges, and other structures subject to wind loading. Supplemented with real-world examples throughout, Low-Speed Wind Tunnel Testing, Third Edition is an indispensable resource for aerospace engineering students and professionals, engineers and researchers in the automotive industries, wind tunnel designers, architects, and others who need to get the most from low-speed wind tunnel technology and experiments in their work.

Download or read book STAR written by and published by . This book was released on 1973 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: