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A Parametric Wind Tunnel Study Of Ribbon Parachutes
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Book Synopsis A Parametric Wind Tunnel Study of Ribbon Parachutes by : D. F. McVey
Download or read book A Parametric Wind Tunnel Study of Ribbon Parachutes written by D. F. McVey and published by . This book was released on 1975 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of a series of wind tunnel tests conducted to define the effect of geometric porosity, reefing line length, and suspension line length on ribbon parachute drag. Twenty degree conical ribbon parachutes with nominal diameter of three feet, goemetric porosities from 15 to 30 percent and line lengths from 1.0 to 2.0 times the parachute nominal diameter were tested at dynamic pressures from 75 to 500 psf. Drag coefficients based on construction and average projected diameters are presented as a function of the independent variables. Data are also presented on parachute shape and inflated diameter. The wind tunnel drag coefficients are compared with data from free flight test of full scale parachutes and with othert wind tunnel data.
Book Synopsis Parametric Study of Parachute Pressure Distribution by Wind Tunnel Testing by : William B. Pepper
Download or read book Parametric Study of Parachute Pressure Distribution by Wind Tunnel Testing written by William B. Pepper and published by . This book was released on 1975 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pressure distribution data for solid and ribbon parachutes are presented. Three-foot diameter model parachutes of 0, 10, 15, 20, 25, 30, and 40 percent geometric porosity were tested. Suspension line lengths of 1.0, 1.5, and 2.0 constructed diameters were used. Reefing line lengths of 19, 38, and 57-in. were tested. Two 7 x 10-ft, wind tunnels were used to test over a range of dynamic pressure from 35 to 600 lb/ft2. Integration of the measured pressures over the inflated canopy profiles generally resulted in drag force values which agree within 10 percent of force balance drag data.
Book Synopsis Wind-tunnel Investigation of Drag and Stabili- Ty of Parachutes at Supersonic Speeds by : Nickolai Charczenko
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:
Book Synopsis Experiments on the Thermal Performance of Ribbon Parachutes by : C. J. Scott
Download or read book Experiments on the Thermal Performance of Ribbon Parachutes written by C. J. Scott and published by . This book was released on 1965 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental heat transfer studies were conducted on full scale ribbons of flat circular type parachutes having a geometric porosity of 20.5 percent. A pressurized subsonic wind tunnel served as the flow facility. The average approach flow velocity was 134 feet per second. The measurements were made in the Reynolds number range of one million to ten million, where the Reynolds number is based on the ribbon width of 2.1 inches and on the velocity and temperature of the flow in the slots between the ribbons. The pressure ratio applied to the ribbon was varied from 1.4 to 26.3. Using a transient energy balance, local and average heat transfer data were obtained and compared with available analyses.
Book Synopsis Evaluation of Wind Tunnel Data and Stress Analysis of Ribbon Parachutes by : Helmut G. Heinrich
Download or read book Evaluation of Wind Tunnel Data and Stress Analysis of Ribbon Parachutes written by Helmut G. Heinrich and published by . This book was released on 1975 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research group of the University of Minnesota concerned with aerodynamic deceleration directed by Prof. H.G. Heinrich is very interested in being engaged in investigations as specified in the work statement and outlined in the preceding technical description. Many years of experience with basic and applied research objectives as well as specialized equipment are available at the University. Parachute models will be fabricated in view of the most advanced status of model technique whenever such fabrication becomes necessary.
Book Synopsis Studies of Aerodynamics, Dynamics, and Stress Analysis of Ribbon Parachutes by : Sandia Corporation
Download or read book Studies of Aerodynamics, Dynamics, and Stress Analysis of Ribbon Parachutes written by Sandia Corporation and published by . This book was released on 1976 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The following report describes the continuation of wind tunnel data evaluation as shown in Progress Reports 3 through 14 under Sandia Coropration Contract 63-2241 amd 02-4022, Ref 1 to 13. The data presented in this report are related to disreefing tests of a conical ribbon parachute with 140° included angle, concentric rings, and 25% geometric porosity. The data concerning the canopy profile and pressure distributions will be presented in chronological order starting at the time of disreefing and proceeding through inflation at various time intervals until steady state conditions for the fully inflated parachute are reached. The recorded and derived data recorded and derived data are used to obtain-force time histories which can be compared with a measured force-time recording. Also, so called radial force coefficients are derived which are based on the established canopy profiles and the related pressure data.
Book Synopsis Recovery System Design Guide by : E. G. Ewing
Download or read book Recovery System Design Guide written by E. G. Ewing and published by . This book was released on 1979 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document serves as the third revision of the USAF Parachute Handbook which was first published in 1951. The data and information represent the current state of the art relative to recovery system design and development. The initial chapters describe representative recovery applications, components, subsystems, material, manufacture and testing. The final chapters provide empirical data and analytical methods useful for predicting performance and presenting a definitive design of selected components into a reliable recovery system.
Book Synopsis Full-scale Drop Tests and Scaled Model Wind Tunnel Tests of Ribbon Parachutes by : William B. Pepper
Download or read book Full-scale Drop Tests and Scaled Model Wind Tunnel Tests of Ribbon Parachutes written by William B. Pepper and published by . This book was released on 1961 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sandia Corporation has been working on parachute systems for vehicle recovery since 1954. Our general approach has been to treat the parachute as we would other aerodynamic problems such as vehicle stability. We have endeavored to conduct scaled parachute model tests in the wind tunnel to study forces, pressures, and dynamic stability of vehicle-parachute systems.
Book Synopsis WInd-tunnel Investigation of the Opening Characteristics, Drag, and Stability of Several Hemispherical Parachutes by : Stanley H. Scher
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.
Book Synopsis Ribbon and Gliding Type Parachutes Evaluated in the 7 by 10 Foot Transonic Wind Tunnel by : Jonah Ottensoser
Download or read book Ribbon and Gliding Type Parachutes Evaluated in the 7 by 10 Foot Transonic Wind Tunnel written by Jonah Ottensoser and published by . This book was released on 1975 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment has been conducted in the NSRDC 7- x10-foot transonic tunnel for the Sandia Corporation to evaluate various parachute parameters. The experiment consisted of three main parts: the first phase evaluated the disreefing characteristics of the various parachutes as well as the drag forces before, during and after disreefing; the second phase measured the pressure distribution around the chute as well as the grag forces; and the fingal phase evaluated the disreefing and drag characteristics of gliding type parachutes. The free stream dynamic pressure varied from 65 to 500 psf.
Book Synopsis WIND TUNNEL STUDY OF PARACHUTE CLUSTERING. by :
Download or read book WIND TUNNEL STUDY OF PARACHUTE CLUSTERING. written by and published by . This book was released on 1963 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four types of parachute canopies were tested in a 12-foot vertical wind tunnel at a velocity of approximately 100 fps to determine the static stability and drag characteristics of multiple canopies in various clustered arrangements under captive and equilibrium test conditions. Solid Flat Circular, Extended Skirt, Ringslot, and Circular Flat Ribbon were the types of canopy tested. Canopies of each type were tested individually and in clusters ranging from two to seven canopies per cluster. A special two-component balance was fabricated to measure the pitching moment and tangential force over an angle-of attack range of =25 degrees. The effects of riser length, angle-of-attack, reefing ratio, and the number of canopies in a cluster on the tan gential force and static stability are discussed. Also, the characteristics peculiar solid type of canopies (Solid Flat Circular and Ex tended Skirt) and to the ribbon type of canopies (Ringslot and Circular Flat Ribbon) are noted.
Book Synopsis Ribbon and Gliding Type Parachutes Evaluated in the 7 by 10 Foot Transonic Wind Tunnel by : Jonah Ottensoser
Download or read book Ribbon and Gliding Type Parachutes Evaluated in the 7 by 10 Foot Transonic Wind Tunnel written by Jonah Ottensoser and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment has been conducted in the NSRDC 7- x10-foot transonic tunnel for the Sandia Corporation to evaluate various parachute parameters. The experiment consisted of three main parts: the first phase evaluated the disreefing characteristics of the various parachutes as well as the drag forces before, during and after disreefing; the second phase measured the pressure distribution around the chute as well as the grag forces; and the fingal phase evaluated the disreefing and drag characteristics of gliding type parachutes. The free stream dynamic pressure varied from 65 to 500 psf.
Book Synopsis 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 by : Charles H. Whitlock
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.
Book Synopsis Pressure and Profile Data of 20° Conical Ribbon Parachutes by : Helumt G. Heinrich
Download or read book Pressure and Profile Data of 20° Conical Ribbon Parachutes written by Helumt G. Heinrich and published by . This book was released on 1977 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sandia Laboratories, Albuquerque, N.M., established wind tunnel data of 3 ft ribbon parachute models concerning canopy profiles, drag forces and pressure distribution. The data were analyzed at the University of Minnesota and resulted in presentations of drag coefficients, projected diameters and drag areas of reefed and unreefed and parachutes versus geometric porosity and suspension line length as well as in tables and graphs of canopy coordinates and related pressure distributions. Presssure integration about the canopy surfaces as given by the established coordinates provided drag forces which agreed satisfactorily with measured forces. Also, radial force coefficients of the various configurations were established. The results of this study are intended to serve as background information for related investigations such as studies concerning parachute dynamics, stress analysis, etc.
Book Synopsis Wind-tunnel Tests of Modified Cross, Hemisflo, and Disk-gap-band Parachutes with Emphasis in the Transonic Range by : James T. Foughner
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.
Book Synopsis The Effects of Flexibility on the Steady State Performance of Small Ribbon Parachutes by : Terry Weber
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.
Author :Ernst Heinrich Hirschel Publisher :Springer Science & Business Media ISBN 13 :3642184847 Total Pages :728 pages Book Rating :4.6/5 (421 download)
Book Synopsis Aeronautical Research in Germany by : Ernst Heinrich Hirschel
Download or read book Aeronautical Research in Germany written by Ernst Heinrich Hirschel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the pioneering glider flights of Otto Lilienthal (1891) to the advanced avionics of today’s Airbus passenger jets, aeronautical research in Germany has been at the forefront of the birth and advancement of aeronautics. On the occasion of the centennial commemoration of the Wright Brother’s first powered flight (December 1903), this English-language edition of Aeronautical Research in Germany recounts and celebrates the considerable contributions made in Germany to the invention and ongoing development of aircraft. Featuring hundreds of historic photos and non-technical language, this comprehensive and scholarly account will interest historians, engineers, and, also, all serious airplane devotees. Through individual contributions by 35 aeronautical experts, it covers in fascinating detail the milestones of the first 100 years of aeronautical research in Germany, within the broader context of the scientific, political, and industrial milieus. This richly illustrated and authoritative volume constitutes a most timely and substantial overview of the crucial contributions to the foundation and advancement of aeronautics made by German scientists and engineers.
