Author(s): Tom Whidden
This is not your parents' Art and Science of Sails, written by Tom Whidden and Michael Levitt and published in 1990 by St. Martin's Press. The first edition sold more than 20,000 copies. The Second Revised Edition 2016 is published by North Sails Group, LLC and written by the same duo. What a difference 25 years makes! Today there are one-piece sails made over a 3D mold in the shape they will assume in the wind. Sail plans have radically evolved to fractional rigs, fat-head mains, and non-overlapping jibs. That is true for racing boats as well as cruising. Thus, ninety percent of the text is new, as are almost all of the more than 100 photographs and technical illustrations. The authors focus on circulation as they did in the first edition, but now come at it from a different direction. And for the first time anywhere, they attempt to quantify its effects. Where the wind speeds up and why as it passes over a sail plan, and where it slows down and why. Circulation theory is familiar to aerodynamicists for at least 100 years and is argued about by sailors at least since 1973, when the late Arvel Gentry loosed his theories on the sailing world. Gentry was an aerodynamicist at Boeing by day and a sailor on the weekends. And the theories used to explain why airplanes fly were at odds with the theories of why sailboats sail to weather and what the slot actually does. Whidden and Levitt utilize explanations like circulation to answer such diverse questions as: * Why fractional rigs, fat-head mains, and non-overlapping jibs have come to predominate. * Why and how leech twist can be a sail-trimmer's best friend. * Why a yacht designer positions the mast, keel, and rudder to create some weather helm. * Why the safe-leeward position is advantageous relative to the entire fleet, not just to the boat you tacked beneath and forward of. * Why a mainsail's efficiency is improved with added upper roach, beyond the value of the extra area. * Why the miracle of upwind sailing is not that there is so much lift but so little drag. * Why, when sailing upwind, the main is always trimmed to a tighter angle than the jib. * What a polar diagram tells us or why tacking downwind is almost always faster than sailing directly to a mark. There is also an in-depth look at the wonders of material utilization-not just materials. Indeed there have been no new fibers accepted into sailmaking for over 20 years. It is how they are used that makes the difference. In the last three chapters, the authors drill down on mainsails, headsails, and downwind asymmetric or symmetric spinnakers. And in this edition for the first time they address downwind aerodynamics. The book celebrates the complexity and beauty of sails and of the whole rarefied sport of sailing.
"I've known Tom Whidden for quite a while since he crewed for me on the 12-Metre Nefertiti. He has always been a student of the technical and business aspects of sailmaking. Whidden has a common-sense approach gained from hands-on ocean racing experience." -- Ted Hood, yacht designer, sail maker "Whidden and Levitt know as much about sails as anybody alive, and they show it in this book. I wish I'd had it to read during my 150-days around alone in American Promise." -- Dodge Morgan, Recordbreaking solo round the world sailor "I'm sure the book will become must reading for anyone who is genuinely interested in knowing why sails work the way they do." -- Charles Mason, Executive Editor (former) Sail Magazine
Tom Whidden is President of North Sails, the world's largest sailmaker. He is also one of the world's most experienced sailors and sailboat racers. Tom Whidden is also author of Championship Tactics, by Tom Whidden, Gary Jobson, and Adam Loory, St. Martin's Press. 1990, ISBN 0312042787. The Art Science of Sails (First Edition) by Tom Whidden and Michael Levitt, St. Martin's Press, 1990. ISBN 10: 0312044178 Michael Levitt is a journalist, sailor and author of numerous sailing books including Herding Tigers: The North Sails Story, by Michael Levitt, North Sails Group, LLC, 2009, ISBN 978-0-615-28649. Ted Hood Through Hand and Eye, by Ted Hood and Michael Levitt, Mystic Seaport, 2006, ISBN 0-939511-14-2. The North Sails Story by Michael Levitt, Fabio Ratti Editoria, 1999 ISBN 10: 0615286496. The America's Cup-the History of Sailing's Greatest Competition in the Twentieth Century by Dennis Conner and Michael Levitt, St. Martin's Press, 1998, ISBN 0-312-18567-7. The Official Record of West McLaren Mercedes Haymarket Specialist Publications Ltd Publishing 1998 ISBN 9780860249580. The Official Record of West McLaren Mercedes, Haymarket Specialist Publications Ltd 1997 ISBN 10 0860249573 Around the World in 79 Days, by Cam Lewis and Michael Levitt, 1996, Delta ISBN 0-385-31326-8.
Introduction... 8 Chapter 1 / An Artist and a Scientist... 18 Chapter 2 / Materials and Technique Matter ... 32 Chapter 3 / The Science of Sails, ...50 Chapter 4 / From Aerodynamic Theory to Practice, ...68 Chapter 5 / Three Dimensional Molded Sails: 3DL 3Di, ... 86 Chapter 6 / The Computer Science of Sailmaking, ... 110 Chapter 7 / Mainsails, ...120 Chapter 8 / Headsails, ... 134 Chapter 9 / Downwind Sails, ... 150 Bibliography ... 170 Index...