Download or read book Elementary Estimates of Parachute Opening Forces written by M. H. L. Waters (B.Sc.(Eng)) and published by . This book was released on 1957 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simple assumptions of the rate of parachute inflation are used to construct data sheets for parachute maximum loads and other quantities. The aim is to present an elementary analysis in detail as a basis for future comparison with experiment. Appendices treat non-horizontal motion of the parachute and store, and estimate the effect on the opening load, of the virtual air mass associated with the canopy. The 'shock factor' as measured in wind tunnel tests is also discussed, and the last Appendix extends the method of calculation to reefed parachutes.

Download or read book Investigation of Opening Characteristics of an All flexible Parawing written by Thomas G. Gainer and published by . This book was released on 1968 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Technical Note written by and published by . This book was released on 1970 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Parachute Filling Time and Opening Force Estimates written by R.G. Hume and published by . This book was released on 1973 with total page 14 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 Research Abstracts and Reclassification Notice written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1956 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Parachute Technology written by Defense Documentation Center (U.S.) and published by . This book was released on 1964 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This bibliography was prepared by the Defense Documentation Center (DDC) for use at a symposium on Parachute Technology. Citations included for documents cataloged by DDC from 1953 through 1963 are restricted to unclassified unlimited references. Entries are arranged in alphabetical sequence by subject areas pertaining to aerial delivery, canopies, materials, parachutes (types), recovery systems, physical effects, and testing. These subject areas are subdivided further into more specific topics.

Download or read book An Analysis of Parachute Opening Forces written by Harry Erwin Ruhsam and published by . This book was released on 1961 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: An outgrowth of Study of the Parachute Opening, Phase I was the realization that more information was neeeded about the actual mouth area as compared to the model mouth area used in that study. The experimental determination of this in terms of a k-factor, the correlation of this with the opening shock forces, and the processing of this data was the purpose of this study. For various reasons the study was incomplete. This report indicates what was to be done, what was done, the difficulties that arose, and make some suggestions about overcoming these difficulties. The point of view taken is that a successful conclusion of the study would have been of some importance and the record of this incomplete study might help to eliminate difficulties in a future study of this type.

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 Aerodynamic Studies written by Zbigniew Krzywoblocki and published by . This book was released on 1960 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculation of Parachute Opening Shock Forces written by Thornton Blanchard and published by . This book was released on 1958 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Military Construction Appropriations for 1994 Justification of the budget estimates Air Force written by United States. Congress. House. Committee on Appropriations. Subcommittee on Military Construction Appropriations and published by . This book was released on 1993 with total page 1374 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerodynamic Studies written by Zbiginew Krzywoblocki and published by . This book was released on 1960 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Notes on a Parachute Opening Force Analysis Applied to a Vertical Toward the Earth Trajectory written by William P. Ludtke and published by . This book was released on 1987 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recovery of payloads from high altitude often requires the deployment of parachutes on trajectories that are essentially vertical and toward the earth. The parachute opening shock force developed by a parachute deployed in this manner exceeds the opening shock force of the same parachute system deployed horizontally at the same altitude and velocity. As the deployment trajectory angle varies from horizontal to vertical, the opening shock force increased to a maximum. Hence, the vertical trajectory has special significance. This report develops an analysis to permit the calculation of opening shock forces in vertical deployment. The validity of the rule of thumb that 'the vertical deployment opening shock force exceeds the horizontal shock force by one 'g' is tested, and criteria are developed. Examples are used to demonstrate applications of the approach, and a method of calculating the inflation time of Solid Cloth parachutes in vertical fall developed. Keywords: Vertical inflation time; Limiting ballistic mass ratio.

Download or read book Notes on a Theoretical Parachute Opening Force Analysis Applied to a General Trajectory written by William P. Ludtke and published by . This book was released on 1988 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents a method for calculating the inflation reference time and opening shock forces of the solid-cloth family of parachutes when deployed at an arbitrary trajectory angle to the horizontal. The method is extended to other types of parachutes, but it is limited in that the inflation reference times are not calculated as part of the deployment process. Particular inflation times must be provided as input data to the furnished computer program. The variation of opening shock force versus inflation reference time may be surveyed by providing several values or using actual field test data. Examples are used to demonstrate the effects of canopy cloth rate of airflow, altitude, and trajectory deployment angle for constant velocity and constant dynamic pressure altitude profiles. Keywords: Variable deployment angle, Inflation time, Parachute technology, Opening shock, Calculation methods, Altitude effects.

Download or read book Notes on a Generic Parachute Opening Force Analysis written by William P. Ludtke and published by . This book was released on 1986 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The determination of parachute opening shock forces is one of the most vital elements in decelerator system design. This report develops a generic opening shock analysis that permits calculation of velocity profiles, shock factors, maximum shock forces and their time of occurrence during deployment for many types of parachutes. Criteria are presented and methods of calculation developed. Application of the analysis to an apparent anomaly in solid cloth parachute finite mass deployment, verifies the parachute diameter effect shown in the test performance. This is illustrated by an example. (Author).