Download or read book Experimental Determination of Parameters for the Calculation of Parachute Filling Times written by Rudi J. Berndt and published by . This book was released on 1964 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The filling or inflation process of a flat circular, solid cloth type parachute canopy operating under finite mass conditions is analyzed in detail. Experimental test results acquired during model tests in wind tunnels and during full scale tests on personnel and air drop type parachute canopies at altitudes between sea level and 21,000 feet form the basis for the analysis. Parameters and relationships acquired as a result of the experimental test programs or derived analytically are expressed in mathematical terms so that they may be used directly for the solution of the mass balance and instantaneous velocity equations upon which the calculations of parachute filling time is based. The parameters and relationships concern the shape of the inflating canopy, the growth of the drag area of the canopy, the canopy flow velocities and growth of the air volume enclosed by the drag producing surface, and the instantaneous velocity of the load-parachute configuration.
Download or read book NASA Technical Note written by and published by . This book was released on 1971 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drag Coefficients for Partially Inflated Flat Circular Parachutes written by Stanley H. Scher and published by . This book was released on 1971 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Free-body tests were made in the Langley spin tunnel to determine drag coefficients for 1.07-meter-diameter (3.5-foot) flat circular parachutes when restrained by wire frames in a series of shapes representing those that parachutes assume during the inflation process. Both high-porosity (stable) and low-porosity (unstable) parachutes were investigated. The results obtained should be applicable to inflation analyses for flat circular parachutes.
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 Symposium on Parachute Technology and Evaluation written by Earl C. Myers and published by . This book was released on 1964 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Volume of Technical Papers written by and published by . This book was released on 1966 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1966 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings Fifth AFCRL Scientific Balloon Symposium written by Lewis A. Grass and published by . This book was released on 1968 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: The document covers a series of papers given at the fifth AFCRL scientific balloon symposium. The subjects were selected to cover the most recent developments in balloon technology and examples of the use of balloons for research purposes. The symposium is intended to provide an exchange of information for the developers of balloon systems and provides an excellent opportunity for scientists to discuss potential balloon capabilities and applications for the accomplishment of scientific programs. Balloon technology presentations included recent material investigations, tandem balloon stress analysis, balloon instrumentation, tethered balloons, cryoinflation feasibility studies and proposed launching techniques for large balloon systems.
Download or read book The Aeronautical Journal written by and published by . This book was released on 1997 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Collection of Technical Papers written by and published by . This book was released on 1973 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Method for the Calculation of Parachute Opening Forces for High Altitude Balloon Payloads written by Peter L. Miller and published by . This book was released on 1975 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the questions most frequently asked by scientists/experimenters who design balloon payloads concerns the magnitude of the opening forces of the parachute recovery system. Existing theory and an analytical method recently developed for horizontal deployment are adapted to balloon systems requirements. Engineering methods are used to develop expressions which allow the assessment of the parachute opening forces.
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 Theory and Experiment on Parachute Opening Shock and Filling Time written by Helmut G. Heinrich and published by . This book was released on 1971 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method of parachute opening force and filling time calculation is presented which is based on the time functions of aerodynamic drag, included air mass, apparent mass, and effective porosity. Using the momentum and continuity equations, an idealized canopy shape development and a linear drag area-time relationship, expressions are obtained for the canopy volume and velocity. The calculated peak forces agree well with at least mean square averages of field test results of 28-ft solid flat parachutes deployed at speeds from 175 to 450 fps at altitudes of 6,000, 13,000, and 21,000 ft and with suspended weights between 200 and 820 lb.
Download or read book Study of Parachute Opening written by J. R. Foote and published by . This book was released on 1958 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model of the opening parachute is considered which permits extensive mathematical analysis. Included are the effects of nine physical parameters, governing drag, initial speed and diameter, parachute dimensions and load, altitude, cloth permeability, and a choking factor representing a difference between the model geometry and observed parachute geometry. The governing equations are developed to a point permitting calculations of system speed, opening rate, and shock force as functions of time. Numerous calculations were made in which the choking factor was varied to yield experimentally-known forces, the variation of this factor having been guided by means of analysis of motion pictures of parachute openings. Other theory was developed for calculation of the individual effects of all the parameters upon the shock force. The nature of current measured data and an insufficient number of calculations have not permitted a verification of this theory for calculation of the individual effects of all the parameters.
Download or read book The Calculation of Filling Time and Transient Loads for a Parachute Canopy During Deployment and Opening written by Bruce Wilcox and published by . This book was released on 1958 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical relations are developed for use in predicting the filling time and transient shock forces during the deployment and opening of a parachute canopy. These relations are used to calculate filling times and loads which are compared with measured values obtained from fullscale parachute research flight tests. The comparison is shown to be good.
Download or read book Experimental Determination of the Apparent Moment of Inertia of Parachutes written by Shukry K. Ibrahim and published by . This book was released on 1965 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental arrangement for determining the apparent moment of inertia of parachute canopy models is described. The rigid canopy models are attached to a simple torsion pendulum and the periods of oscillation of the models and suspension system in air and in water are measured and used to calculate the apparent moment of inertia of the model canopies. The validity of the experimental arrangement was verified by measuring the apparent mass of some simple geometric bodies such as spheres and cubes and comparing the results with known theoretical values. Models of the circular flat, ribbon and ribless guide surface canopy shapes were tested for angular motion about two different axes and the results are presented in nondimensional coefficient form. Additional results showing the effect of geometric porosity on the apparent moment of inertia of a ribbon type parachute canopy model are presented in the appendix. (Author).
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.
