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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html;CHARSET=iso-8859-1"> <META NAME="GENERATOR" Content="Symantec Visual Page Mac 1.1.1"> <TITLE>AYRS No 120</TITLE> </HEAD> <BODY BGCOLOR="#FFFFFF"> <DIV ALIGN="RIGHT"> <P><A HREF="http://ourworld.compuserve.com/homepages/Fishwick/ayrs.htm"><FONT SIZE="2">AYRS Pages |</FONT></A><A HREF="../../speedsl/"><FONT SIZE="2"> Dave Culp Speedsailing |</FONT></A><FONT SIZE="2"> </FONT><A HREF="http://ourworld.compuserve.com/homepages/Fishwick/ayrslist.htm"><FONT SIZE="2">Order this Book</FONT></A><FONT SIZE="2"> </FONT><A HREF="#errata"><FONT SIZE="2">| Errata</A></FONT><SPACER TYPE="HORIZONTAL" SIZE="65"> <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="10" WIDTH="100%"> <TR> <TD WIDTH="50%" VALIGN="MIDDLE" BGCOLOR="#FFFFFF"><IMG SRC="cover.gif" WIDTH="215" HEIGHT="282" ALIGN="LEFT" ALT="21st Century Sailing Multihulls" BORDER="0" HSPACE="30"></TD> <TD WIDTH="50%" VALIGN="TOP"> <P> <H3 ALIGN="RIGHT"><IMG SRC="1pix.gif" WIDTH="45" HEIGHT="280" ALIGN="RIGHT" BORDER="0"><BR> <BR> A.Y.R.S.<BR> Presents:</H3> <H2 ALIGN="RIGHT">21st Century<BR> Sailing Multihulls</H2> <H3 ALIGN="RIGHT">Joseph<BR> Norwood<BR> Jr.</H3> <P ALIGN="RIGHT"><BR> Paperback, in 2 parts, 150 pages<BR> £5.00/$8.00, AYRS members<BR> £10.00/$16.00, non-members<BR> plus shipping </TD> </TR> <TR> <TD WIDTH="50%" VALIGN="TOP"><FONT SIZE="2">This seminal work by one of sailing technology's most knowledgeable authors is available now at an incredible price. This book may well become <B>the</B> 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</FONT></TD> <TD WIDTH="50%" VALIGN="TOP"><FONT SIZE="2">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.</FONT></TD> </TR> </TABLE> </DIV> <P ALIGN="CENTER"><FONT SIZE="2"><B>CONTENTS</B></FONT></P> <BLOCKQUOTE> <BLOCKQUOTE> <P><FONT SIZE="2"><B>PREFACE </B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which the reader is told what to expect and a few friends are thanked.</I><BR> <B>1 - INTRODUCTIONS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we look at the wind on a moving object and see how a sailing boat <BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>utilizes it.</I><BR> <B>2 - PERFORMANCE CRITERIA</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we grapple with the general theory of multihull sailing craft</I><BR> <B>3 - HULLS AND OUTRIGGERS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we derive the criteria for miminum-resistance hulls and present an easy<BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>method to design them</I><BR> <B>4 - WINGSAILS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we examine the pros and cons of rigid permanently deployed wingsails</I><BR> <B>5 - WIND AND WATER TURBINES</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we see what it takes to sail directly into the wind and to sail directly <BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>downwind faster than the wind</I><BR> <B>6 - BOARDS AND RUDDERS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we examine leeway prevention and steering for advanced multihulls and <BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>come to some novel conclusions</I><BR> <B>7 - ROTORS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we find that a rotating circular cylinder with fences may provide maximum <BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>sailing performance at minimum cost</I><BR> <B>8 - HYDROFOIL APPLICATIONS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we evaluate hydrofoil applications to pitch and roll stability, and to <BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>seakeeping and performance enhancement</I><BR> <B>9 - SYMETRIC MULTIHULLS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="10"><FONT SIZE="2"><I>- in which we arrange the foregoing bits and pieces into laterally symetruc <BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>catamarans and trimarans</I><BR> <B>10 - ASYMETRIC MULTIHULLS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>- in which we take a critical look at proas and see that they may constitute the <BR> </I></FONT><SPACER TYPE="HORIZONTAL" SIZE="18"><FONT SIZE="2"><I>ultimate multihull configuration</I><BR> <B>11 - POSTSCRIPTS AND AFTERTHOUGHTS</B><BR> </FONT><SPACER TYPE="HORIZONTAL" SIZE="15"><FONT SIZE="2"><I>- in which we fill in some gaps and try to answer some of the questions</I><BR> <B>12 - REFERENCES</B></FONT> </BLOCKQUOTE> </BLOCKQUOTE> <P><A NAME="errata"></A><FONT SIZE="2">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:</FONT> <CENTER> <A HREF="http://www.dcss.org/ayrs/AYRSpubs/erratalink.html"><FONT SIZE="2">http://www.dcss.org/ayrs/AYRSpubs/erratalink.html</FONT></A></CENTER> <BR> <FONT SIZE="2">With this file, and the FREE reader available free from </FONT><A HREF="http://www.adobe.com/prodindex/acrobat/readstep.html"><FONT SIZE="2">Adobe Systems</FONT></A><FONT SIZE="2">, 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.<BR> <BR> </FONT><A HREF="http://www.ayrs.org/joinayrs.htm"><FONT SIZE="2">Join AYRS for just £20/$30 per year</FONT></A><FONT SIZE="2"> and order the book with your membership.<B> </B></FONT><B>Save £5/$8!</B></P> <P><FONT SIZE="2" FACE="Arial, Helvetica">Questions? Suggestions? Ideas for links? Send 'em to: </FONT><A HREF="mailto:[email protected]"><FONT SIZE="2" FACE="Arial, Helvetica"><I>[email protected]<BR> <BR> </I></FONT></A><FONT SIZE="2" FACE="Arial, Helvetica"><I>"AYRS" and the logo are copyright Amateur Yacht Research Society and are used with permission</I></FONT></P> <P ALIGN="CENTER"><A HREF="mailto:[email protected]"><FONT SIZE="2">Comments? |</FONT></A><A HREF="http://ourworld.compuserve.com/homepages/Fishwick/ayrs.htm"><FONT SIZE="2"> AYRS Pages |</FONT></A><FONT SIZE="2"> </FONT><A HREF="../../speedsl/"><FONT SIZE="2">Dave Culp Speedsailing </FONT></A><A HREF="../speedsl/"><FONT SIZE="2">|</FONT></A><FONT SIZE="2"> </FONT><A HREF="http://ourworld.compuserve.com/homepages/Fishwick/ayrslist.htm"><FONT SIZE="2">Order this Book</FONT></A> </BODY> </HTML>