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21st Century Sailing Multihulls



A.Y.R.S.
Presents:

21st Century
Sailing Multihulls

Joseph
Norwood
Jr.


Paperback, in 2 parts, 150 pages
£5.00/$8.00, AYRS members
£10.00/$16.00, non-members
plus shipping

This seminal work by one of sailing technology's most knowledgeable authors is available now at an incredible price. This book may well become the defininitive primer for cutting edge technology in offshore fast and comfortable multihull sailcraft in the coming decades. The book covers everything from formulae-generated minimal drag hull shapes to wind and water turbine powered, faster than wind craft. Come learn about Thom rotors, capable of lift coefficients over 20, at L/D's of 35, and why this technology was wrongly abandoned 70 years ago. Learn what to expect of hydrofoils offshore, and how to design them. Learn why a hybrid of the Atlantic and Pacific proa may be the fastest, safest cruising sailcraft on the planet.

CONTENTS

PREFACE
- in which the reader is told what to expect and a few friends are thanked.
1 - INTRODUCTIONS
- in which we look at the wind on a moving object and see how a sailing boat
utilizes it.
2 - PERFORMANCE CRITERIA
- in which we grapple with the general theory of multihull sailing craft
3 - HULLS AND OUTRIGGERS
- in which we derive the criteria for miminum-resistance hulls and present an easy
method to design them
4 - WINGSAILS
- in which we examine the pros and cons of rigid permanently deployed wingsails
5 - WIND AND WATER TURBINES
- in which we see what it takes to sail directly into the wind and to sail directly
downwind faster than the wind
6 - BOARDS AND RUDDERS
- in which we examine leeway prevention and steering for advanced multihulls and
come to some novel conclusions
7 - ROTORS
- in which we find that a rotating circular cylinder with fences may provide maximum
sailing performance at minimum cost
8 - HYDROFOIL APPLICATIONS
- in which we evaluate hydrofoil applications to pitch and roll stability, and to
seakeeping and performance enhancement
9 - SYMETRIC MULTIHULLS
- in which we arrange the foregoing bits and pieces into laterally symetruc
catamarans and trimarans
10 - ASYMETRIC MULTIHULLS
- in which we take a critical look at proas and see that they may constitute the
ultimate multihull configuration
11 - POSTSCRIPTS AND AFTERTHOUGHTS
- in which we fill in some gaps and try to answer some of the questions
12 - REFERENCES

As a service to AYRS members and to current owners of 21st Century Sailing Multihulls, an errata in either Adobe Acrobat (.pdf) or zipped GIF formats are available:

http://www.dcss.org/ayrs/AYRSpubs/erratalink.html

With this file, and the FREE reader available free from Adobe Systems, you can read the errata on-screen, or print it full size, at the highest resolution your printer is capable. New purchasers of the book will receive the printed errata with the book.

Join AYRS for just £20/$30 per year and order the book with your membership. Save £5/$8!

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