Author: William B. Walcott
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 56
Book Description
A study was conducted to determine the effects of changing scale upon drag coefficients, filling time, peak opening force, and stability for single, unreefed textile parachute canopies. The investigation was confined to Flat Circular, Extended Skirt, Ringslot, Ribless Guide Surface, Circular Flat Ribbon, and Conical Ribbon parachutes operating in the subsonic flow regime at altitudes below 20,000 feet. As an integral part of the study, a survey of the existing literature and test data, a compilation of all pertinent data, and recommendations for future experimental investigations were made. Scaling equations with associated 95-percent confidence intervals were developed for the drag coefficient of the Flat Circular and Extended Skirt parachutes through the use of multiple regression analysis which the indicates the significant variables and their functional forms. Because the available data was poorly distributed, the equations will have to be used circumspectly to avoid misleading conclusions.
Study of Parachute Scale Effects
Author: William B. Walcott
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 56
Book Description
A study was conducted to determine the effects of changing scale upon drag coefficients, filling time, peak opening force, and stability for single, unreefed textile parachute canopies. The investigation was confined to Flat Circular, Extended Skirt, Ringslot, Ribless Guide Surface, Circular Flat Ribbon, and Conical Ribbon parachutes operating in the subsonic flow regime at altitudes below 20,000 feet. As an integral part of the study, a survey of the existing literature and test data, a compilation of all pertinent data, and recommendations for future experimental investigations were made. Scaling equations with associated 95-percent confidence intervals were developed for the drag coefficient of the Flat Circular and Extended Skirt parachutes through the use of multiple regression analysis which the indicates the significant variables and their functional forms. Because the available data was poorly distributed, the equations will have to be used circumspectly to avoid misleading conclusions.
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 56
Book Description
A study was conducted to determine the effects of changing scale upon drag coefficients, filling time, peak opening force, and stability for single, unreefed textile parachute canopies. The investigation was confined to Flat Circular, Extended Skirt, Ringslot, Ribless Guide Surface, Circular Flat Ribbon, and Conical Ribbon parachutes operating in the subsonic flow regime at altitudes below 20,000 feet. As an integral part of the study, a survey of the existing literature and test data, a compilation of all pertinent data, and recommendations for future experimental investigations were made. Scaling equations with associated 95-percent confidence intervals were developed for the drag coefficient of the Flat Circular and Extended Skirt parachutes through the use of multiple regression analysis which the indicates the significant variables and their functional forms. Because the available data was poorly distributed, the equations will have to be used circumspectly to avoid misleading conclusions.
Experimental Investigation of Reynolds Number and Scale Effects on Parachute Inflation
Author: Kellie A. Popp
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 224
Book Description
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 224
Book Description
Study of Parachute Performance at Low Supersonic Deployment Speeds: Effects of Changing Scale and Clustering
Author: PAUL E. PEDERSEN
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
Prachute design and operational data were collected on a series of rocket powered sled tests conducted on the Air Force Flight Test Center Track at Edwards Air Force Base, California. Parachute deployment velocities range between Mach 0.76 and 1.57. The majority of the test parachutes were designed to have a drag area of approximately 15 square feet. Limited testing was accomplished with some configurations of reduced drag area to investigate effects of changing scale. Clustering of parachutes was also investigated with triple clusters of FIST Ribbon parachutes. The data obtained during the program included inflation characteristics, opening shock factors, drag forces, inflated area relationships, and stability of the parachutes through the velocity ranges investigated. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
Prachute design and operational data were collected on a series of rocket powered sled tests conducted on the Air Force Flight Test Center Track at Edwards Air Force Base, California. Parachute deployment velocities range between Mach 0.76 and 1.57. The majority of the test parachutes were designed to have a drag area of approximately 15 square feet. Limited testing was accomplished with some configurations of reduced drag area to investigate effects of changing scale. Clustering of parachutes was also investigated with triple clusters of FIST Ribbon parachutes. The data obtained during the program included inflation characteristics, opening shock factors, drag forces, inflated area relationships, and stability of the parachutes through the velocity ranges investigated. (Author).
Subsonic Parachute Design, Performance, and Similarity Laws (scale Effects)
Author: C. Saliaris
Publisher:
ISBN:
Category : Air drop
Languages : en
Pages : 52
Book Description
Under a Data Exchange Agreement with the US Air Force a research project (Subsonic Parachute Design, Performance, and Similarity Laws) has been conducted during the last ten years to investigate the aerodynamics and flight mechanics of parachute-payload systems with special consideration of scale effects. A brief summary of the theoretical and experimental investigations will be given. The results obtained from full tests with flat circular canopies will be reported in more detail.
Publisher:
ISBN:
Category : Air drop
Languages : en
Pages : 52
Book Description
Under a Data Exchange Agreement with the US Air Force a research project (Subsonic Parachute Design, Performance, and Similarity Laws) has been conducted during the last ten years to investigate the aerodynamics and flight mechanics of parachute-payload systems with special consideration of scale effects. A brief summary of the theoretical and experimental investigations will be given. The results obtained from full tests with flat circular canopies will be reported in more detail.
Recovery System Design Guide
Author: E. G. Ewing
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 502
Book Description
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.
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 502
Book Description
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.
U.S. Government Research Reports
Scientific and Technical Aerospace Reports
Symposium on Parachute Technology and Evaluation
Author: Earl C. Myers
Publisher:
ISBN:
Category : Low altitude aeronautics
Languages : en
Pages : 432
Book Description
Publisher:
ISBN:
Category : Low altitude aeronautics
Languages : en
Pages : 432
Book Description
Observations on Parachute Scale Factors for Modeling Parachute Deployment and Steady State Performance
Author: William P. Ludtke
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 65
Book Description
A New approach to the scaling of parachute performance is presented, based upon variables inherent in the inflation process such as weight, time, geometry, etc. Limitations of conventional scaling parameters such as Reynold's, Froude, and Mach numbers as applied to parachutes are discussed. Examples of parachute inflation and steady state performance are correlated with a scale factor designated as a Mass Ratio, which is the ratio of the system mass to a mass of atmosphere associated with the parachute size, inflation time, altitude and deployment velocity. For advanced opening shock analyses, the concept of variable mass ratio during canopy inflation is proposed, and the effects of partial canopy inflation at suspension line stretch are discussed. Although the solid cloth types of parachutes are primarily used as examples, the ideas of mass ratio, initial area, and analysis techniques are applicable to all types of parachutes. (Author).
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 65
Book Description
A New approach to the scaling of parachute performance is presented, based upon variables inherent in the inflation process such as weight, time, geometry, etc. Limitations of conventional scaling parameters such as Reynold's, Froude, and Mach numbers as applied to parachutes are discussed. Examples of parachute inflation and steady state performance are correlated with a scale factor designated as a Mass Ratio, which is the ratio of the system mass to a mass of atmosphere associated with the parachute size, inflation time, altitude and deployment velocity. For advanced opening shock analyses, the concept of variable mass ratio during canopy inflation is proposed, and the effects of partial canopy inflation at suspension line stretch are discussed. Although the solid cloth types of parachutes are primarily used as examples, the ideas of mass ratio, initial area, and analysis techniques are applicable to all types of parachutes. (Author).
Technical Abstract Bulletin
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1148
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1148
Book Description