Download or read book Model Parachutes Comparison Tests of Various Types written by United States. Air Force Materiel Command. Engineering Division and published by . This book was released on 1949 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 WADC Technical Report written by United States. Wright Air Development Division and published by . This book was released on 1953 with total page 1278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Tail and Wing tip Spin recovery Parachutes as Determined by Tests in the Langley 20 foot Free spinning Tunnel written by Robert William Kamm and published by . This book was released on 1946 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: Tests of spin-recovery parachutes on six models of typical fighter and trainer airplanes were conducted in the Langley 20-foot free-spinning tunnel to obtain data for correlating model and full-scale results. Parachutes attached to the tail of the models, to the out wing tip (left wing tip for a right spin), to the inner wing tip, and to both wing tips were tested. The results indicated that parachutes of the same size and type were more effective as spin-recovery devices when they were attached to the outer wing tip in the spin than when they were attached to the tail. The diameter of the outer wing-tip parachute required for a 2-turn recovery by parachute action alone varied from 4 to 7 feet. Parachutes attached to the inner wing tip would not effect recovery. When parachutes attached to both wing tips were used for recovery, the parachute diameters required were of the same order as for tail parachutes. The diameter of the tail parachute required for a 2-turn recovery by parachute action alone varied from 6.5 to 12.5 feet for the airplane designs used.
Download or read book U S Government Research Reports written by and published by . This book was released on 1961 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drop Tests of 16 000 square inch Model Parachutes written by Frederick J. Stimler and published by . This book was released on 1960 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the results of the parachute model drop-test program conducted in the Goodyear Aircraft Corporation airship dock at Akron, Ohio. Twenty-seven different models of the following types with 16,000 sq. in. total canopy area were tested: Soild Flat, Solid Extended Skirt, Solid Spherical, Solod Conical, Airfoil, Exeter Type 12, Guide Surface, Ring Slot, and FIST Ribbon. An "information" sheet is provided for each of the parachute models and includes a short statement describing general behavior of the parachute during descent and a basic reference list where more information may be found concerning similar parachutes.
Download or read book Drop Tests of 16 000 square inch Model Parachutes written by Frederick J. Stimler and published by . This book was released on 1960 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Performance in free fall of 27 model parachutes of various designs was determined by drop tests conducted in the Goodyear Aircraft Corporation airship dock at Akron, Ohio. Models of approximately 16,000 square inches of cloth surface area were tested to determine the influence of the shape of the canopy (type) and the rate of descent on the drag and stability of spacific types of parachutes. The influence of the shroud-line length on the aerodynamic characteristics and the stability of the solid-flat 10% extended-skirt parachute was also investigated. All models were tested at vertical terminal velocities of approximnately 10, 15, 25, and 40 feet per second for both vertical and horizontal types of release.
Download or read book Wind Tunnel Testing of Small Scale Parachute Models and Comparison with Theory written by Sonia Gulbankian and published by . This book was released on 1994 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A New Approach to the Determination of the Steady State Inflated Shape and Included Volume of Several Parachute Types in 24 Gore and 30 Gore Configurations written by William P. Ludtke and published by . This book was released on 1970 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: AD-702041 documented a new method of determining the steady-state inflated shape and included volume of several types of parachutes in 12-gore and 16-gore configurations. This report uses the methods and technique of AD-702 041 to extend the data to 24-gore and 30-gore configurations of the flat circular, 10 percent extended skirt, 16 percent porous ring slot and 24 percent porous ribbon parachutes. The inflated elliptical shapes of the various canopies were obtained from photographic records of the wind-tunnel tests at various velocities from 17 mph to 200 mph using parachute models of approximately 40-inch flat diameter. The steady-state canopy volume includes the volume of the billowed gore panel and an air volume ahead of the canopy skirt hem. The results of this investigation are particularly applicable to studies of canopy stress analysis and determination of the volume of air which must be collected during canopy inflation process for use in the calculation of opening-shock force. (Author).
Download or read book A New Approach to the Determination of the Steady state Inflated Shape and Included Volume of Several Parachute Types written by William P. Ludtke and published by . This book was released on 1969 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new approach is presented to obtain the steady-state inflated shape of the gore mainseam and the canopy volume of flat circular, 10 percent extended skirt, elliptical, hemispherical, 16 percent porous ring slot, 24 percent porous ribbon in 12- and 16-gore configurations and cross-type parachutes. The canopies are demonstrated to closely elliptical in cross section. The axis ratios of the ellipses are derived from photographic coverage of wind-tunnel tests of models of each type of parachute. Wind-tunnel tests were conducted at various velocities from 17 mph to 200 mph using flat parachute models of approximately 40-inch diameter and shaped gore models of approximately 26-inch inflated diameter. Axis ratios, scale factors, and methods of computing the coordinates of the inflated canopy shape are presented. A new approach to the steady-state volume of the parachute, which includes the volume of the billowed gore and an air volume ahead of the skirt hem of the canopy, is given. The results of this investigation are particularly applicable to studies of canopy stress analysis and determination of the volume of air, which must be collected during canopy inflation process for use in the calculation of opening-shock force. (Author).
Download or read book Drop Tests of 16 000 sq in Model Parachutes written by Frederick J. Stimler and published by . This book was released on 1954 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the results of the parachute model drop-test program conducted in the Goodyear Aircraft Corporation airship dock at Akron, Ohio. Twenty-seven different models of the following types with 16,000 sq. in. total canopy area were tested: Solid Flat, Solid Extended Skirt, Solid Spherical, Solid Conical, Airfoil, Exeter Type 12, Glide Surface, Ring Slot and FIST Ribbon. An "information" sheet is provided for each of the parachute models and includes a short statement describing general behavior of the parachute during descent and a basic reference list where more information may be found concerning similar parachutes.
Download or read book Parachute Recovery Systems written by Theo W. Knacke and published by . This book was released on 1992 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Low speed Free flight Stability and Drag Characteristics of Radially Vented Parachutes written by Sanger M. Burk and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A drop-test investigation has been conducted to determine the stability and drag characteristics of radially vented (duplex) parachutes. Parachutes of two different designs were tested: a large parachute with high geometric porosity and a small parachute with low geometric porosity designed for the same descent velocity with the same load. The results of the tests show that the large high-porosity duplex parachute was very stable in descent, oscillations averaging about [plus-or-minus]3.40; and the average drag coefficient based on the total canopy area and based on the fabric area alone were approximately 0.38 and 0.55, respectively. The small, low-porosity duplex parachute was also very stable in descent, oscillations averaging about [plus-or-minus]4.50; and the average drag coefficients based on the total canopy area and based on the fabric area alone were approximately 0.62 and 0.79, respectively. The oscillations for the cluster of three solid flat circular parachutes, tested for comparison purposes, were [plus-or-minus]7.10. The average drag coefficients based on the total canopy area and the fabric area alone were approximately 0.64 and 0.65, respectively.
Download or read book NASA Technical Note written by and published by . This book was released on 1968 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance of and Design Criteria for Deployable Aerodynamic Decelerators written by George Chernowitz and published by . This book was released on 1964 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present state-of-the-art, technology, and theory applicable to deployable aerodynamic decelerators, especially textile parachute canopies, are presented. Major types of decelerators are described, and their aerodynamic and operational characteristics, as well as applications, are discussed. Detailed coverage is given to decelerator materials, design and construction, hardware, test methods and vehicles, and test instrumentation. Decelerator design procedures and performance prediction techniques are demonstrated by sample calculations.
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 Collection of Technical Papers written by and published by . This book was released on 1975 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
