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Aerodynamics Of The Para Sail
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Book Synopsis Aerodynamics of the Para-sail by : Edwin D. Vickery
Download or read book Aerodynamics of the Para-sail written by Edwin D. Vickery and published by . This book was released on 1965 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is the objective of this report to review certain steady state aerodynamic characteristics of the Para-Sail parachute obtained from full scale drop tests (Ref 1), and from small scale wind tunnel studies (Ref 2 to 5). A correlation is made between the wind tunnel and drop test data, to determine what differences exist, if any, between these two modes of experimentation. Also, in conclusion, an evaluation is made of the performance characteristics of the Para-Sail.
Book Synopsis Sailing Aerodynamics by : John Morwood
Download or read book Sailing Aerodynamics written by John Morwood and published by . This book was released on 1962 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Yacht Racing - The Aerodynamics of Sails and Racing Tactics by : Manfred Curry
Download or read book Yacht Racing - The Aerodynamics of Sails and Racing Tactics written by Manfred Curry and published by Read Books Ltd. This book was released on 2012-12-21 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide for racing yachtsman that is as useful today as when it was first published. Teaching the fundamentals of the start line, beating to windward, rounding a mark, wind abeam, before the wind. This book is a wonderful collection of anecdotes, tactics and case studies. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.
Book Synopsis Aero-hydrodynamics of Sailing by : Czeslaw A. Marchaj
Download or read book Aero-hydrodynamics of Sailing written by Czeslaw A. Marchaj and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The international classic work of reference for anyone wishing to understand the factors governing the performance of a sailing boat. Everyone interested in yacht design should read this book. A new Appendix in this Third Edition presents a simple graphic method for predicting a yacht's behavior.
Book Synopsis Aero-hydrodynamics of Sailing by : Czesław A. Marchaj
Download or read book Aero-hydrodynamics of Sailing written by Czesław A. Marchaj and published by . This book was released on 1988 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sailplane Design by : Vittorio Pajno
Download or read book Sailplane Design written by Vittorio Pajno and published by . This book was released on 2006 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Design and Development of the Para-sail Parachute by : W. J. Everett
Download or read book The Design and Development of the Para-sail Parachute written by W. J. Everett and published by . This book was released on 1965 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents in summary form some of the design aspects of the Para-Sail parachute and the developmental work which has been accomplished thru [sic] flight testing during the past three years. During this period the aerodynamic performance has been improved and a high deployment reliability established. As a result of these efforts a wide variety of Para-Sail applications has [sic] developed and new ones are being considered. These applications range from space craft recovery to its [sic] use as a training aid for aircraft crews. At present the number of applications for gliding parachutes concepts appears to be limited only by the imagination.
Book Synopsis Aero-hydrodynamics and the Performance of Sailing Yachts by : Fabio Fossati
Download or read book Aero-hydrodynamics and the Performance of Sailing Yachts written by Fabio Fossati and published by A&C Black. This book was released on 2009-12-18 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: A groundbreaking technical analysis of yacht design based on cutting edge research in the field of aero-hydrodynamics.
Book Synopsis The Symmetry of Sailing by : Ross Garrett
Download or read book The Symmetry of Sailing written by Ross Garrett and published by Sheridan House, Inc.. This book was released on 1996 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is a detailed study of the motive forces of a yacht written in clear and accessible terms. The author has the rare gift of enabling his readers to relate the nautical phenomena with which they are so familiar to a scientific explanation of how and why these occur. The first part covers downwind sailing, upwind sailing, sails, the hull, and the dynamic motion of a yacht. Part Two is devoted to more mathematical explanations of the same phenomena for those requiring a more scientific approach.
Book Synopsis Determination of the Stability, Drag, and Aerodynamic Center of the Para-Sail by : Eugene L. Haak
Download or read book Determination of the Stability, Drag, and Aerodynamic Center of the Para-Sail written by Eugene L. Haak and published by . This book was released on 1965 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of a parachute is significantly influenced by the aerodynamic parameters related to tangential and nominal force and aerodynamic moment. This report contains the experimentally determined value of tangent and normal force and moment coefficients for the Para-Sail parachute as a function of the angle of attack in the incompressible flow regime. Furthermore, the line of action of the resultant aerodynamic force with respect to the parachute centerline as well as the magnitude of the front and rear riser forces have been determined.
Book Synopsis Unsteady Aerodynamics of Upwind-sailing and Tacking by : Frederik C. Gerhardt
Download or read book Unsteady Aerodynamics of Upwind-sailing and Tacking written by Frederik C. Gerhardt and published by . This book was released on 2011 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Predicting unsteady sailing yacht performance is of significant current interest to racing syndicates and yacht designers alike because it is anticipated that optimising boats for dynamic conditions will lead to large performance gains. Such optimisations are usually carried out with the aid of Dynamic Velocity Prediction Programs (DVPPs). These programs require knowledge about the behaviour of the sails in unsteady flow. To this end Part A of this work looks at the simplified unsteady aerodynamics of a yacht that sails upwind in waves. Unsteady thin aerofoil theory is extended to the case of two interacting aerofoils representing the headsail and mainsail. The developed novel method is analytical in nature and is based on representing the sail bound vorticity distributions and the unsteady vortex wakes by planar vortex sheets. The theory is successfully validated against data from the literature and pressure distributions from wind tunnel tests. An application of the theory to the case of an International America's Cup Class yacht that pitches in waves reveals that the time-varying components of the aerodynamic forces are small and that only very little energy can be extracted from the unsteady flow about the sails and converted into thrust. Part B looks at the aerodynamics of a yacht that tacks. Since today's DVPPs usually suffer from a lack of available data on the behaviour of the sail forces at very low apparent wind angles a series of quasi-steady experiments was carried out. Test results for different tacking scenarios (headsail flogging or backed) are presented in a form that facilitates incorporation into a DVPP. The quasi-steady approach used in the wind tunnel tests does not account for unsteady effects like the aerodynamic inertia due to the 'added mass' of the sails. The added inertia of a sail can, however, be estimated by 'strip theory'. Using expressions from the literature and experimental results it is found that such a strip theory over-estimates the added inertia of a mainsail by about 20%because it neglects the three-dimensional flow around the head and the foot of the sails. Using the DVPP FS Equilibrium the influence of added sail inertia on the tacking behaviour of a yacht is studied and it is found that added sail inertia has a small but noticeable influence on tacking performance.
Book Synopsis Yacht Sail Aerodynamics by : F. D. Hales
Download or read book Yacht Sail Aerodynamics written by F. D. Hales and published by . This book was released on 1989 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Full-scale Investigation of the Aerodynamic Characteristics of a Model Employing a Sailwing Concept by : Marvin P. Fink
Download or read book Full-scale Investigation of the Aerodynamic Characteristics of a Model Employing a Sailwing Concept written by Marvin P. Fink and published by . This book was released on 1967 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation has been conducted in the Langley full-scale tunnel to determine the aerodynamic characteristics of a full-scale model employing a sailwing concept and having a wing aspect ratio of 11.5. The wing had a rigid leading-edge spar, rigid root and wing-tip ribs with a trailing-edge stretched between these ribs, and a fabric covering stretched between the leading and trailing edeges. The fabric of the sail maintained a smooth airfoil contour over the installed angle-of-attack range, but some rippling occurred at the trailing edge near the wing root as the wing stalled. The aerodynamic characteristics of the sailwing, in particular the maximum lift and maximum lift-drag ratio, compared favorably with those of conventional hard wings. A lateral-control device based on the wing-warp principle was effective at angles of attack below that for wing stall, but at angles near stall, the control effectiveness became low and nonlinear.
Book Synopsis The Aero- and Hydromechanics of Keel Yachts by : J.W. Slooff
Download or read book The Aero- and Hydromechanics of Keel Yachts written by J.W. Slooff and published by Springer. This book was released on 2015-04-29 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: How and why does sail boat performance depend on the configuration and trim of boat and sails? This book provides the yachtsman with answers in a relatively straightforward account of the physical mechanisms of sailing. It presents an accessible overview of the fluid dynamic aspects of sailing and sailing technology, addressing both aeromechanics and hydromechanics. Readers are provided with the basic principles of physics and general mechanics that will assist their understanding of the fluid mechanics of sailing yachts. Rich appendices cover not only in-depth,mathematical-physical treatments and derivations for those wishing to explore further, but also helpful summaries of basic mathematical notions for those wishing to refresh their knowledge. This work explores keel yachts, specifically single-masted mono-hulls with ‘fore-and-aft’, Bermuda-rigged sails. However, much of it is applicable to other types of sailing vessels such as multi-hulls, yachts with multiple masts, windsurf boards and the like. Yachtsmen, yacht designers and professionals of sailing technology will all find something of interest in this work which provides explanations of the mechanics of sailing in a way that is scientifically justified, whilst remaining appealing to those wishing to use their knowledge on-board a sailing vessel.
Book Synopsis An Experimental Investigation of Full-scale Sail Aerodynamics Using Pressures, Shapes and Forces by : Dario Motta
Download or read book An Experimental Investigation of Full-scale Sail Aerodynamics Using Pressures, Shapes and Forces written by Dario Motta and published by . This book was released on 2015 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sail aerodynamics is an active field of study in the research community. The basic behaviour of sails in steady conditions is well known due to numerical computations and wind tunnel testing, but there are several unanswered questions about the sail aerodynamics in actual, dynamic, sailing conditions. The unsteady aerodynamics of upwind sails has been addressed very few times in the past, both by numerical and experimental methods, and there is still a lack of knowledge on the unsteady aerodynamics of downwind sails. At the present time only full-scale testing can give some of the answers to the questions of what is really happening to downwind sails on the water. This project aims at improving the understanding of the unsteady aerodynamics of downwind sails at full-scale. This is done by measuring instantaneous pressures and sail shapes at full-scale, and combining them to obtain the aerodynamic forces developed from the sails. The measuring system, developed at the University of Auckland and named FEPV (`Force Evaluation via Pressures and VSPARS'), is validated for both upwind and downwind sailing by comparing its predictions with wind tunnel measurements carried out at the Twisted Flow Wind Tunnel of the University of Auckland. The steady aerodynamics of upwind and downwind sails at full-scale are investigated, at first, in this project, by averaging the measured pressures, sail shapes and yacht motions over chosen recording times. The averaged differential pressure distributions across the sail sections are compared with the expected and measured pressure fields from the literature. The calculated aerodynamic forces are compared with wind tunnel measurements, and a good agreement is found. The unsteady aerodynamics of downwind sails is then investigated by combining the knowledge of the instantaneous values of the differential pressures across the sails, of the sail shapes and of the aerodynamic forces. The results of two different tests, carried out on a J80 and a Stewart 34 class yachts respectively, are presented in this thesis. In either case, the yacht is equipped with an asymmetric spinnaker and it is found that, even in relatively steady wind conditions and limited yacht motions, the spinnaker has a very dynamic behaviour. The periodic folding and filling of the spinnaker luff influences the differential pressure distributions, in particular near the luff , and the aerodynamic forces, which have large variations from their average values during the recording time. The recovery of the sail shape is found to produce very large suctions near the luff and an increase in the drive force that would not be otherwise achieved.
Book Synopsis Numerical Analysis of the Sail Aerodynamics by : Grzegorz Liskiewicz
Download or read book Numerical Analysis of the Sail Aerodynamics written by Grzegorz Liskiewicz and published by LAP Lambert Academic Publishing. This book was released on 2010-06 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction phenomenon causes two sails (the jib and the main sail) working together in an upwind condition to produce a larger lift force than a sum of lifts generated on the sails operating alone. In spite of the fact that this phenomenon is widely known to both sailors and sail designers, its reason is still regarded arguable. The aim of this work is to use the advantages of numerical methods to provide an exhaustive description of the aerodynamical mechanisms causing the sails to interact. In order to attain this aim, an adequate simulation methodology has been developed. The authors have used various types of meshes corresponding to different sail combinations (two for single sails, three for different configurations of interacting sails). Every geometry has been examined for eight different angles of attack. All the obtained results are throughly analyzed and compared to the references available.
Book Synopsis Understanding Aerodynamic Characteristics of Windsurfing by : Paul Ng
Download or read book Understanding Aerodynamic Characteristics of Windsurfing written by Paul Ng and published by . This book was released on 1992 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
