Author: Eugene L. Haak
Publisher:
ISBN:
Category : Airdrop
Languages : en
Pages : 80
Book Description
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.
Calculated Values of Transient and Steady State Performance Characteristics of Man-carrying, Cargo, and Extraction Parachutes
Author: Eugene L. Haak
Publisher:
ISBN:
Category : Airdrop
Languages : en
Pages : 80
Book Description
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.
Publisher:
ISBN:
Category : Airdrop
Languages : en
Pages : 80
Book Description
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.
Technical Abstract Bulletin
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 784
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 784
Book Description
Drag and Dynamics of Single and Clustered Parachutes in Freestream, and with Wake and Ground Effects
Author: Helmut G. Heinrich
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 100
Book Description
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.
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 100
Book Description
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.
Behavior of Extraction Parachutes in the Wake of a Powered Airplane Model
Author: H. G. Heinrich
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 108
Book Description
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.
Publisher:
ISBN:
Category : Parachutes
Languages : en
Pages : 108
Book Description
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.
A Method of Investigating the Deployment Characteristics of Man-carrying Parachutes
Author: A. G. Jolly
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Test releases of man-carrying parachutes from balloons, or aircraft, do not permit of any detailed examination of the processes of withdrawing the rigging lines and canopy from the pack (i.e. deployment). Irregularities during this phase may cause malfunctions to develop during opening. The method of test described permits examination of the deployment from the parachute pack and reveals information lacking in flight tests. It is proposed that this test method may be used to investigate the behaviour of new, or modified parachute systems. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Test releases of man-carrying parachutes from balloons, or aircraft, do not permit of any detailed examination of the processes of withdrawing the rigging lines and canopy from the pack (i.e. deployment). Irregularities during this phase may cause malfunctions to develop during opening. The method of test described permits examination of the deployment from the parachute pack and reveals information lacking in flight tests. It is proposed that this test method may be used to investigate the behaviour of new, or modified parachute systems. (Author).
Parachute Recovery Systems
Author: Theo W. Knacke
Publisher:
ISBN:
Category : Sports & Recreation
Languages : en
Pages : 524
Book Description
The purpose of this manual is to provide recovery system engineers in government and industry with tools to evaluate, analyze, select, and design parachute recovery systems. These systems range from simple, one-parachute assemblies to multiple-parachute systems, and may include equipment for impact attenuation, flotation, location, retrieval, and disposition. All system aspects are discussed, including the need for parachute recovery, the selection of the most suitable recovery system concept, concept analysis, parachute performance, force and stress analysis, material selection, parachute assembly and component design, and manufacturing. Experienced recovery system engineers will find this publication useful as a technical reference book; recent college graduates will find it useful as a textbook for learning about parachutes and parachute recovery systems; and technicians with extensive practical experience will find it useful as an engineering textbook that includes a chapter on parachute- related aerodynamics. In this manual, emphasis is placed on aiding government employees in evaluating and supervising the design and application of parachute systems. The parachute recovery system uses aerodynamic drag to decelerate people and equipment moving in air from a higher velocity to a lower velocity and to a safe landing. This lower velocity is known as rate of descent, landing velocity, or impact velocity, and is determined by the following requirements: (1) landing personnel uninjured and ready for action, (2) landing equipment and air vehicles undamaged and ready for use or refurbishment, and (3) impacting ordnance at a preselected angle and velocity.
Publisher:
ISBN:
Category : Sports & Recreation
Languages : en
Pages : 524
Book Description
The purpose of this manual is to provide recovery system engineers in government and industry with tools to evaluate, analyze, select, and design parachute recovery systems. These systems range from simple, one-parachute assemblies to multiple-parachute systems, and may include equipment for impact attenuation, flotation, location, retrieval, and disposition. All system aspects are discussed, including the need for parachute recovery, the selection of the most suitable recovery system concept, concept analysis, parachute performance, force and stress analysis, material selection, parachute assembly and component design, and manufacturing. Experienced recovery system engineers will find this publication useful as a technical reference book; recent college graduates will find it useful as a textbook for learning about parachutes and parachute recovery systems; and technicians with extensive practical experience will find it useful as an engineering textbook that includes a chapter on parachute- related aerodynamics. In this manual, emphasis is placed on aiding government employees in evaluating and supervising the design and application of parachute systems. The parachute recovery system uses aerodynamic drag to decelerate people and equipment moving in air from a higher velocity to a lower velocity and to a safe landing. This lower velocity is known as rate of descent, landing velocity, or impact velocity, and is determined by the following requirements: (1) landing personnel uninjured and ready for action, (2) landing equipment and air vehicles undamaged and ready for use or refurbishment, and (3) impacting ordnance at a preselected angle and velocity.
Scientific and Technical Aerospace Reports
International Aerospace Abstracts
The Naval Aviation Maintenance Program (NAMP).: Maintenance data systems
Author: United States. Office of the Chief of Naval Operations
Publisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 828
Book Description
Publisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 828
Book Description
Bulletin of the Atomic Scientists
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
Book Description
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
Book Description
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.