Isbn: 9780997392005 - the art and science of sails (23 résultats)

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  • Langue : anglais

    Edité par Seapoint Books & Media LLC, 2016

    0997392002 / 9780997392005

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    Vendeur : Better World Books, Mishawaka, IN, Etats-UnisBetter World Books

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    Etat: Occasion - Satisfaisant

    EUR 22,90

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    Expédition nationale : Etats-Unis

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    Etat : Good. Former library copy. Pages intact with minimal writing/highlighting. The binding may be loose and creased. Dust jackets/supplements are not included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : GreatBookPrices, Columbia, MD, Etats-UnisGreatBookPrices

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    Etat: Occasion - Comme neuf

    EUR 25,89

    EUR 2,32 expédition 
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    Quantité disponible : 3 disponible(s)

    Etat : As New. Unread book in perfect condition.

  • Langue : anglais

    Edité par Simon and Schuster, 2016

    0997392002 / 9780997392005

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    Vendeur : INDOO, Avenel, NJ, Etats-UnisINDOO

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    Etat: Occasion - Comme neuf

    EUR 28,29

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    Etat : As New. Unread copy in mint condition.

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : GreatBookPrices, Columbia, MD, Etats-UnisGreatBookPrices

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    Etat: Neuf

    EUR 25,98

    EUR 2,32 expédition 
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    Quantité disponible : 5 disponible(s)

    Etat : New.

  • Langue : anglais

    Edité par Simon and Schuster, 2016

    0997392002 / 9780997392005

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    Vendeur : INDOO, Avenel, NJ, Etats-UnisINDOO

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    EUR 28,37

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    Etat : New. Brand New.

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : California Books, Miami, FL, Etats-UnisCalifornia Books

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    Etat: Neuf

    EUR 32,55

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    Quantité disponible : 5 disponible(s)

    Etat : New.

  • Langue : anglais

    Edité par Seapoint Books, Sydney, NSW, 2016

    0997392002 / 9780997392005

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    Vendeur : Grand Eagle Retail, Bensenville, IL, Etats-UnisGrand Eagle Retail

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    EUR 35,39

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    Expédition nationale : Etats-Unis

    Quantité 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 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. 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.…

  • Langue : anglais

    Edité par Seapoint Books and Media LLC, US, 2016

    0997392002 / 9780997392005

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    Vendeur : Rarewaves USA, HEBRON, KY, Etats-UnisRarewaves USA

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    EUR 37,48

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    Expédition nationale : Etats-Unis

    Quantité disponible : 3 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 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, 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.…

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : Revaluation Books, Exeter, Royaume-UniRevaluation Books

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    Etat: Neuf

    EUR 34,92

    EUR 17,44 expédition 
    Expédition depuis Royaume-Uni vers Etats-Unis

    Quantité disponible : 3 disponible(s)

    Hardcover. Etat : Brand New. 2nd edition. 182 pages. 11.25x9.25x1.00 inches. In Stock.

  • Langue : anglais

    Edité par Seapoint Books and Media LLC, US, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : Rarewaves.com USA, London, LONDO, Royaume-UniRarewaves.com USA

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    Etat: Neuf

    EUR 53,05

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    Expédition depuis Royaume-Uni vers Etats-Unis

    Quantité disponible : 4 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 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, 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.…

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : Russell Books, Victoria, BC, CanadaRussell Books

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    Etat: Neuf

    EUR 36,12

    EUR 17,55 expédition 
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    Quantité disponible : 5 disponible(s)

    Hardcover. Etat : New. Special order direct from the distributor.

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : Kennys Bookshop and Art Galleries Ltd., Galway, GY, IrlandeKennys Bookshop and Art Galleries Ltd.

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    Etat: Neuf

    EUR 43,89

    EUR 9,50 expédition 
    Expédition depuis Irlande vers Etats-Unis

    Quantité disponible : Plus de 20 disponibles

    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. . . . . …

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : GreatBookPricesUK, Woodford Green, Royaume-UniGreatBookPricesUK

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    Etat: Occasion - Comme neuf

    EUR 38,57

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    Expédition depuis Royaume-Uni vers Etats-Unis

    Quantité disponible : 3 disponible(s)

    Etat : As New. Unread book in perfect condition.

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : GreatBookPricesUK, Woodford Green, Royaume-UniGreatBookPricesUK

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    EUR 39,00

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    Etat : New.

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : Kennys Bookstore, Olney, MD, Etats-UnisKennys Bookstore

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    EUR 53,74

    EUR 9,22 expédition 
    Expédition nationale : Etats-Unis

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    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. …

  • Langue : anglais

    Edité par Seapoint Books, USA, 2016

    0997392002 / 9780997392005

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    Vendeur : Shiny Owl Books, Gloucester, NSW, AustralieShiny Owl Books

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    Etat: Occasion - Assez bon

    EUR 41,92

    EUR 20,19 expédition 
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    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 ordering for a quote. Click Ask Bookseller a Question** *** WE ONLY POST TO AUSTRALIA NZ CANADA USA JAPAN SINGAPORE SWITZERLAND & UK VIA THIS SERVICE*** .…

  • Langue : anglais

    Edité par Seapoint Books, 2016

    0997392002 / 9780997392005

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    Vendeur : Revaluation Books, Exeter, Royaume-UniRevaluation Books

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    EUR 50,09

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    Hardcover. Etat : Brand New. 2nd edition. 182 pages. 11.25x9.25x1.00 inches. In Stock.

  • Langue : anglais

    Edité par Seapoint Books and Media LLC, US, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : Rarewaves USA United, HEBRON, KY, Etats-UnisRarewaves USA United

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    Etat: Neuf

    EUR 39,01

    EUR 43,89 expédition 
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    Quantité disponible : 3 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 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, 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.…

  • Langue : anglais

    Edité par SEAPOINT BOOKS, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : moluna, Greven, Allemagnemoluna

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    Etat: Neuf

    EUR 39,79

    EUR 48,99 expédition 
    Expédition depuis Allemagne vers Etats-Unis

    Quantité disponible : 5 disponible(s)

    Etat : New. A bible of modern sail handling and selection. It is presented in an oversize format along with four/color photographs.InhaltsverzeichnisIntroduction.

  • Langue : anglais

    Edité par Seapoint Books, Sydney, NSW, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : CitiRetail, Stevenage, Royaume-UniCitiRetail

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    Etat: Neuf

    EUR 48,49

    EUR 43,02 expédition 
    Expédition depuis Royaume-Uni vers Etats-Unis

    Quantité 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 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. 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.…

  • Langue : anglais

    Edité par NewSouth Publishing, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : THE SAINT BOOKSTORE, Southport, Royaume-UniTHE SAINT BOOKSTORE

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    Etat: Neuf

    EUR 67,86

    EUR 25,17 expédition 
    Expédition depuis Royaume-Uni vers Etats-Unis

    Quantité disponible : 7 disponible(s)

    Hardback. Etat : New. New copy - Usually dispatched within 4 working days.

  • Langue : anglais

    Edité par Seapoint Books, Sydney, NSW, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : AussieBookSeller, Truganina, VIC, AustralieAussieBookSeller

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    Etat: Neuf

    EUR 73,78

    EUR 32,48 expédition 
    Expédition depuis Australie vers Etats-Unis

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    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 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. 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.…

  • Langue : anglais

    Edité par Seapoint Books and Media LLC, US, 2016

    0997392002 / 9780997392005

    • Couverture rigide

    Vendeur : Rarewaves.com UK, London, Royaume-UniRarewaves.com UK

    Vendeur avec une évaluation de 5 étoiles
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    Etat: Neuf

    EUR 50,16

    EUR 75,58 expédition 
    Expédition depuis Royaume-Uni vers Etats-Unis

    Quantité disponible : 3 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 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, 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.…