Download or read book Analysis of the Opening Dynamics of Solid Flat and Ringslot Parachutes with Suppporting Wind Tunnel Experiments written by Helmut G. Heinrich and published by . This book was released on 1972 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The equation of motion for parachutes inflating under finite mass conditions in a horizontal flow wind tunnel is established and organized in view of the nonsteady terms of canopy size, velocity, included and apparent masses, and the time derivatives of these terms. Wind-tunnel experiments with solid flat and ringslot parachutes are described, the results of which yield graphical and numerical time functions for the terms of the equation of motion. In the test range under investigation, these functions appear to be unique. The wind-tunnel results are compared with fill-size test information and certain identities are shown. The numerical functions are substituted in the equation of motion and force-time histories are calculated. Calculated and measured forces agree fairly well, and the calculations show the contributions of the various terms to the total farachute force.
Download or read book Analysis of the Opening Dynamics of Solid Flat and Ringslot Parachutes with Supporting Wind Tunnel Experiments written by Helmut G. Heinrich and published by . This book was released on 1972 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The equations of motion for parachutes inflating under finite mass conditions in a horizontal flow wind tunnel are established and organized in view of the nonsteady terms of canopy size, velocity, included and apparent masses, and the time derivatives of these terms. Wind-tunnel experiments with solid flat and ringslot parachutes are described, the results of which yield graphical and numerical time functions for the terms of the derived equation of motion. The wind-tunnel results are compared with full-size test information and certain identities are shown. The numerical functions are substituted in the equation of motion and force-time histories are calculated.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1974 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Parachute Opening Dynamics with Supporting Wind Tunnel Experiements written by Helmut G. Heinrich and published by . This book was released on 1968* with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study is concerned with identification of significant terms in the process of parachute inflation. For finite mass cases, the equations of motion for parachutes inflating in free air and in wind tunnel experiments are established and organized in view of the nonsteady terms of canopy size, systems velocity, included and apparent masses, and the time derivatives of these terms. Wind tunnel experiments are described, the results of which yield graphical and numerical time functions for the significant terms of the equation of motion and the force-time histories. The wind tunnel results are compared with full size test information and certain identities are shown. The significant terms are combined to functions unique for the test conditions and substituted in the equation of motion. Force-time functions so derived compare satisfactorily with measured force histories and the contributions of the individual terms to the instantaneous parachute force can be seen.
Download or read book 29th International Symposium on Shock Waves 2 written by Riccardo Bonazza and published by Springer. This book was released on 2015-07-10 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings present the results of the 29th International Symposium on Shock Waves (ISSW29) which was held in Madison, Wisconsin, U.S.A., from July 14 to July 19, 2013. It was organized by the Wisconsin Shock Tube Laboratory, which is part of the College of Engineering of the University of Wisconsin-Madison. The ISSW29 focused on the following areas: Blast Waves, Chemically Reactive Flows, Detonation and Combustion, Facilities, Flow Visualization, Hypersonic Flow, Ignition, Impact and Compaction, Industrial Applications, Magnetohydrodynamics, Medical and Biological Applications, Nozzle Flow, Numerical Methods, Plasmas, Propulsion, Richtmyer-Meshkov Instability, Shock-Boundary Layer Interaction, Shock Propagation and Reflection, Shock Vortex Interaction, Shock Waves in Condensed Matter, Shock Waves in Multiphase Flow, as well as Shock Waves in Rarefield Flow. The two Volumes contain the papers presented at the symposium and serve as a reference for the participants of the ISSW 29 and individuals interested in these fields.
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.
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 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 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 Middle and Upper Atmosphere Results written by COSPAR. Plenary Meeting and published by Elsevier Science & Technology. This book was released on 1992 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers presented in this volume have been divided into three main chapters. Firstly Atmospheric Trace Species which is primarily concerned with the construction of a COSPAR International Reference Atmosphere (CIRA -Volume 3) for trace constituents of the middle atmosphere and lower thermosphere. Possible reference models and data were presented on a number of trace species including background stratospheric aerosols, polar stratospheric clouds, methane, nitrous oxide, ozone, water vapor, thermospheric nitric oxide, molecular oxygen airglow emissions, atomic oxygen and atomic hydrogen. Chapter 2 entitled Equatorial Thermosphere and Aeronomy: Models and San Marco Satellite/Ground Based observations reflects the advances made recently in equatorial aeronomy and demonstrate the promise of coordinated measurements using satellite measurements in conjunction with sounding rockets and ground-based experiments. The final chapter, Coupling of Dynamical, Radiative and Chemical Processes in the Middle Atmosphere examines the ozone hole and related atmospheric chemistry and modelling.
Download or read book Behavior of Extraction Parachutes in the Wake of a Powered Airplane Model written by H. G. Heinrich and published by . This book was released on 1968 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The drag and stability characteristics of single and clustered solid flat and ringslot parachutes as cargo extraction systems in the wake of a model of the Caribou airplane with windmilling and powered propellers are reported. The investigation also includes the effect of actuated wing trailing flaps, and the variation of the parachute performance parameters in midair and near the ground. It was found that in all cases the drag coefficient of the cluster decreases with the increased number of canopies in the cluster, and a single ringslot parachute is more stable than the most stable cluster of solid flat canopies. The effects of the powered propeller slipstream and flap actuation are noticeable but not dominating. Also, wake surveys of the airplane showed characteristic dynamic pressure defects or increases for power off or on flight conditions. The location of these pressure fields was noticeably influenced by flap actuation and ground effects.
Download or read book Analysis of Wind Tunnel Tests Concerning Disengagement Impulses of Parachute Suspension Lines and Risers written by Helmut G. Heinrich and published by . This book was released on 1972 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 28-ft solid flat parachute, United States Air Force Standard C-9 canopy was deployed from its deployment bag in a wind tunnel running at speeds of 115, 150, and 200 fps. By means of electronic instrumentation the impulses were recorded that developed when the risers and suspension lines are disengaged from their ties and stow loops. The disengagement impulses were repeatable, and their numerical value was established and confirmed. The influence of the impulses upon the velocity of the moving mass is significant.
Download or read book Pressure Distribution During Parachute Opening written by H. D. Melzig and published by . This book was released on 1966 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation and correlative analysis were conducted to determine the pressure distribution over the surface of parachute canopies during the period of inflation for the infinite mass case and to correlate pressure coefficients with inflating canopy shapes. Parachute canopy models of Circular Flat, 10% Extended Skirt, Ringslot, and Ribbon designs were tested under infinite mass conditions in a 9 x 12 ft low speed wind tunnel. External and internal pressure values were measured at various locations over the surface of the model canopies throughout the period of inflation, and generalized canopy profile shapes were obtined by means of photographic analysis.
Download or read book Investigation of Cross Wind Effects on Stable Parachute Point mass Systems written by Helmut G. Heinrich and published by . This book was released on 1966 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of horizontal wind shear layers upon descending, statically stable parachutes has been studied analytically and experimentally. The investigation was concerned with horizontal displacements, response velocity, response time, and angle of attack. Experiments were conducted with two circular flat ribbon, two ringslot, and one ribless guide surface parachute model. The results show that the analytical predictions are a satisfactory first approximation of the observed performance characteristics.
Download or read book Model Parachutes Comparison Tests of Various Types written by T. W. Knacke and published by . This book was released on 1949 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind tunnel and drop tests were made on model parachutes of various types, to study the influence o[n] performance of such factors as design, shape, size, load, porosity, and line length. All the unstable parachutes which were tested, such as solid flat, solid conical, and solid spherical types, have a pronounced increase in the drag coefficient C[subscript]D with decreasing rate of descent in the range of 35 to 8[0 fps]. The stable prarachutes, including the high porosity, pseudo-ribbon, guided surface, and ribbon, have a practically constant C[subscript]D. Square and triangular parachutes have higher drag than round parachutes o[f the] same area. Thirty-degree-conical and quarter-spherical parachutes have higher drag than flat and hemispherical parachutes. The Airfoil parachute has higher drag than the standard flat parachute an[d] is fairly stable. The length of the suspension lines influences the drag.
Download or read book U S Government Research Reports written by and published by . This book was released on 1963 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
