9780997392005 - the art and science of sails par whidden, tom; levitt, michael (22 résultats)
- Couverture rigide
Vendeur : GreatBookPrices, Columbia, MD, Etats-UnisGreatBookPrices
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Occasion - Comme neuf
EUR 25,55
EUR 2,29 expéditionExpédition nationale : Etats-UnisQuantité disponible : 9 disponible(s)
Etat : As New. Unread book in perfect condition.
- Couverture rigide
Vendeur : INDOO, Avenel, NJ, Etats-UnisINDOO
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Occasion - Comme neuf
EUR 27,91
Frais de port gratuitsExpédition nationale : Etats-UnisQuantité disponible : Plus de 20 disponibles
Etat : As New. Unread copy in mint condition.
- Couverture rigide
Vendeur : GreatBookPrices, Columbia, MD, Etats-UnisGreatBookPrices
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 25,63
EUR 2,29 expéditionExpédition nationale : Etats-UnisQuantité disponible : 9 disponible(s)
Etat : New.
- Couverture rigide
Vendeur : INDOO, Avenel, NJ, Etats-UnisINDOO
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 28,00
Frais de port gratuitsExpédition nationale : Etats-UnisQuantité disponible : Plus de 20 disponibles
Etat : New. Brand New.
- Couverture rigide
Vendeur : Grand Eagle Retail, Bensenville, IL, Etats-UnisGrand Eagle Retail
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 34,92
Frais de port gratuitsExpédition nationale : Etats-UnisQuantité disponible : 1 disponible(s)
Hardcover. Etat : new. Hardcover. 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 di…fference 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. A bible of modern sail handling and selection. It is presented in an oversize format along with four/color photographs. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.
- Couverture rigide
Vendeur : Rarewaves USA, OSWEGO, IL, Etats-UnisRarewaves USA
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 37,98
Frais de port gratuitsExpédition nationale : Etats-UnisQuantité disponible : 2 disponible(s)
Hardback. Etat : New. 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 -- now in its second printing -- is published by North Sails Group, LLC and written by th…e 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, CEO of North Marine Group, which includes North Sails, and Levitt, who has written 14 books, 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 utilizationnot 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 and symmetric spinnakers. And in this edition for the first time they address downwind aerodynamics. The book celebrates the complexity and beauty of sails in words and pictures and of the whole rarefied sport of sailing.
- Couverture rigide
Vendeur : Russell Books, Victoria, BC, CanadaRussell Books
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 28,52
EUR 17,32 expéditionExpédition depuis Canada vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardcover. Etat : New. Special order direct from the distributor.
- Couverture rigide
Vendeur : Revaluation Books, Exeter, Royaume-UniRevaluation Books
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 30,94
EUR 17,55 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 4 disponible(s)
Hardcover. Etat : Brand New. 2nd edition. 182 pages. 11.25x9.25x1.00 inches. In Stock.
- Couverture rigide
Vendeur : Rarewaves.com USA, London, LONDO, Royaume-UniRarewaves.com USA
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 52,88
Frais de port gratuitsExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardback. Etat : New. 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 -- now in its second printing -- is published by North Sails Group, LLC and written by th…e 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, CEO of North Marine Group, which includes North Sails, and Levitt, who has written 14 books, 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 utilizationnot 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 and symmetric spinnakers. And in this edition for the first time they address downwind aerodynamics. The book celebrates the complexity and beauty of sails in words and pictures and of the whole rarefied sport of sailing.
- Couverture rigide
Vendeur : GreatBookPricesUK, Woodford Green, Royaume-UniGreatBookPricesUK
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 36,95
EUR 17,55 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 8 disponible(s)
Etat : New.
- Couverture rigide
Vendeur : Brit Books, Milton Keynes, Royaume-UniBrit Books
Contacter le vendeurVendeur avec une évaluation de 4 étoilesEtat: Occasion - Assez bon
EUR 35,73
EUR 18,71 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardcover. Etat : Used; Very Good. ***Simply Brit*** Welcome to our online used book store, where affordability meets great quality. Dive into a world of captivating reads without breaking the bank. We take pride in offering a wide selection of used books, from classics to hidden gems, ensuring there is something for every liter…ary palate. All orders are shipped within 24 hours and our lightning fast-delivery within 48 hours coupled with our prompt customer service ensures a smooth journey from ordering to delivery. Discover the joy of reading with us, your trusted source for affordable books that do not compromise on quality.
- Couverture rigide
Vendeur : Kennys Bookshop and Art Galleries Ltd., Galway, GY, IrlandeKennys Bookshop and Art Galleries Ltd.
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 44,73
EUR 9,50 expéditionExpédition depuis Irlande vers Etats-UnisQuantité disponible : 10 disponible(s)
Etat : New. A bible of modern sail handling and selection. It is presented in an oversize format along with four/color photographs. Num Pages: 182 pages, 15 colour illustrations, 200 colour illustrations. BIC Classification: WSD; WSSN3. Category: (G) General (US: Trade). Dimension: 224 x 284 x 2. Weight in Grams: 68. . 2016. 2nd… Edition. Hardcover. . . . .
- Couverture rigide
Vendeur : Shiny Owl Books, Gloucester, NSW, AustralieShiny Owl Books
Contacter le vendeurVendeur avec une évaluation de 4 étoilesEtat: Occasion - Assez bon
EUR 41,60
EUR 19,92 expéditionExpédition depuis Australie vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardcover. Etat : Very Good. Etat de la jaquette : Very Good. Revised Second Edition. Size: Large (27 to 34cm). Item Type: Book. Text body is clean and unmarked. Binding tight, spine fine. Minor marks and wear to book and jacket. ISBN/EAN: 9780997392005. **Heavy Book. A Postage surcharge may be requested. Contact us BEFORE order…ing for a quote. Click Ask Bookseller a Question** *** WE ONLY POST TO AUSTRALIA, NZ, CANADA, JAPAN, SINGAPORE & UK VIA THIS SERVICE***.
- Couverture rigide
Vendeur : Kennys Bookstore, Olney, MD, Etats-UnisKennys Bookstore
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 54,72
EUR 9,10 expéditionExpédition nationale : Etats-UnisQuantité disponible : 10 disponible(s)
Etat : New. A bible of modern sail handling and selection. It is presented in an oversize format along with four/color photographs. Num Pages: 182 pages, 15 colour illustrations, 200 colour illustrations. BIC Classification: WSD; WSSN3. Category: (G) General (US: Trade). Dimension: 224 x 284 x 2. Weight in Grams: 68. . 2016. 2nd… Edition. Hardcover. . . . . Books ship from the US and Ireland.
- Couverture rigide
Vendeur : Revaluation Books, Exeter, Royaume-UniRevaluation Books
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 49,29
EUR 17,55 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardcover. Etat : Brand New. 2nd edition. 182 pages. 11.25x9.25x1.00 inches. In Stock.
- Couverture rigide
Vendeur : Rarewaves USA United, OSWEGO, IL, Etats-UnisRarewaves USA United
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 39,86
EUR 43,31 expéditionExpédition nationale : Etats-UnisQuantité disponible : 1 disponible(s)
Hardback. Etat : New. 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 -- now in its second printing -- is published by North Sails Group, LLC and written by th…e 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, CEO of North Marine Group, which includes North Sails, and Levitt, who has written 14 books, 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 utilizationnot 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 and symmetric spinnakers. And in this edition for the first time they address downwind aerodynamics. The book celebrates the complexity and beauty of sails in words and pictures and of the whole rarefied sport of sailing.
- Couverture rigide
Vendeur : moluna, Greven, Allemagnemoluna
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 39,60
EUR 48,99 expéditionExpédition depuis Allemagne vers Etats-UnisQuantité disponible : 2 disponible(s)
Gebunden. Etat : New. A bible of modern sail handling and selection. It is presented in an oversize format along with four/color photographs.InhaltsverzeichnisIntroduction.
- Couverture rigide
Vendeur : THE SAINT BOOKSTORE, Southport, Royaume-UniTHE SAINT BOOKSTORE
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 68,30
EUR 25,34 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 5 disponible(s)
Hardback. Etat : New. New copy - Usually dispatched within 4 working days.
- Couverture rigide
Vendeur : CitiRetail, Stevenage, Royaume-UniCitiRetail
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 48,80
EUR 43,30 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardcover. Etat : new. Hardcover. 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 di…fference 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. A bible of modern sail handling and selection. It is presented in an oversize format along with four/color photographs. Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.
- Couverture rigide
Vendeur : GreatBookPricesUK, Woodford Green, Royaume-UniGreatBookPricesUK
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Occasion - Comme neuf
EUR 82,27
EUR 17,55 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 8 disponible(s)
Etat : As New. Unread book in perfect condition.
- Couverture rigide
Vendeur : AussieBookSeller, Truganina, VIC, AustralieAussieBookSeller
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 73,21
EUR 32,05 expéditionExpédition depuis Australie vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardcover. Etat : new. Hardcover. 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 di…fference 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. A bible of modern sail handling and selection. It is presented in an oversize format along with four/color photographs. Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.
- Couverture rigide
Vendeur : Rarewaves.com UK, London, Royaume-UniRarewaves.com UK
Contacter le vendeurVendeur avec une évaluation de 5 étoilesEtat: Neuf
EUR 49,01
EUR 76,07 expéditionExpédition depuis Royaume-Uni vers Etats-UnisQuantité disponible : 1 disponible(s)
Hardback. Etat : New. 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 -- now in its second printing -- is published by North Sails Group, LLC and written by th…e 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, CEO of North Marine Group, which includes North Sails, and Levitt, who has written 14 books, 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 utilizationnot 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 and symmetric spinnakers. And in this edition for the first time they address downwind aerodynamics. The book celebrates the complexity and beauty of sails in words and pictures and of the whole rarefied sport of sailing.
