round foot

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" height=90 BGCOLOR="#99CCFF" TEXT="#080000" bgproperties="fixed" background="03e76bc1egdyqn.png"> <div> <FONT SIZE="5" COLOR="#FFFFCC" FACE="Arial" ><B>start</B></FONT><B>   |  </B></div> <div> <A HREF="id54.htm" TARGET="_top" TITLE="WELCOME"><U>WELCOME</U></A>   |   <A HREF="id55.htm" TARGET="_top" TITLE="what do you want to make"><U>what do you want to make</U></A>   |   <A HREF="id56.htm" TARGET="_top" TITLE="measuring"><U>measuring</U></A>   |   <A HREF="id52.htm" TARGET="_top" TITLE="Statements"><U>Statements</U></A>   |   <A HREF="id57.htm" TARGET="_top" TITLE="measuring the jib"><U>measuring the jib</U></A>   |   <A HREF="id62.htm" TARGET="_top" TITLE=" jib formula,s"><U> jib formula,s</U></A>   |   <A HREF="id58.htm" TARGET="_top" TITLE="measuring the mainsail"><U>measuring the mainsail</U></A>   |   <A HREF="id65.htm" TARGET="_top" TITLE="formula,s for 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BGCOLOR="#99CCFF" TEXT="#080000" bgproperties="fixed" background="03e76ba3.png"> <div> how to make the  rounded foot</div> <div> to make an exact calculation for the compleet sail you must calculate the </div> <div> round foot first ,this means that the gore's of each panel which runs on to the foot has a different angle,in this way a round foot is created</div> <div> for an average curve I mostly use the following rule,</div> <bR> <DIV ALIGN="LEFT"></DIV> <div> place 1/3 of the length clew up    on 2/5 of the length tack/clew      work from the tack</div> <bR> <div> <IMG SRC="12626eb0.jpg" border=0 width="550" height="235" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div> this means that the panel with this mark has the same gore aswel in the ruff as in the exact calculations and is the deepest point in the foot ,,,its easy for checking. </div> <div> the panels that come's from the clew are used to make a smooth line to this x-panel and the panels that are going on to the tack are used for making a smooth line to this point.</div> <bR> <div> an example,,,</div> <div> lets say that we have a sail that has 9 panels in the foot the clewdown is 180 cm.</div> <div> so 180:9=20.</div> <div> so all the gore's in the <U>ruff</U> calculation is 20cm. for each panel .</div> <div> this means that if we cut all panels with a gore of 20 cm.,</div> <div> we end up on the tack with a straight lined foot but we want a <U>round foot</U> </div> <div> so lets try this</div> <div> between the x-panel and the clew we have 5 panel's</div> <div> we start with </div> <div> panel 1 is cut off as good as 90 degrees so the gore is 0</div> <div> panel 2 needs a little gore lets say -2 cm.</div> <div> panel 3 needs a little more gore lets say -6 cm.</div> <div> panel 4 needs a little more lets say -10 cm.</div> <div> panel 5 we give -15cm gore see how we crawl to the gore of the x-panel</div> <div> Xpanel6   -20cm. <U>same gore as the ruff calculations</U>  </div> <bR> <div> now we complete the foot  with the 3 panels left in a nice curve to the tack</div> <bR> <div> panel 7 but not to fast up lets say -30cm.</div> <div> panel 8 now we need to go up so lets give this one -42cm.</div> <div> panel 9 as last one we end up with a smooth line by the tack with -55cm.gore</div> <bR> <div> in a sailtable it looks like this.</div> <div>   </div> <DIV ALIGN="LEFT"></DIV> <div> <TABLE BORDER="2" CELLPADDING="2" CELLSPACING="1" WIDTH="534" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 24 WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP><NOBR><div> afterlenght   </div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> peakgore</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> luffgore</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> footgore</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> forelenght </div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 1</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div> 0</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 2</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div>    - 2</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 3 </div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div>  - 6</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 4 </div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div>   - 10</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div>  panel 5</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div> - 15</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 6 </div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP><NOBR><div> - x 20 x</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 7</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div>   - 30</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 8 </div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div>  - 42</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 24 ><NOBR><div> panel 9</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="107"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="107" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="71" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP WIDTH="71"><div> - 55</div> </tD> <tD VALIGN=TOP WIDTH="96"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="24" ALIGN="bottom" WIDTH="96" HSPACE="0" VSPACE="0"></tD> </tR> </TABLE></div> <bR> <div> the gore's of the peak and luff  are mostly the same as in the ruff calculation </div> <div> so the changing  numbers are from the fore and after side length of each panel.  </div> <div>   </div> <bR> <div> <U>the soma of al the new gore's in the round foot are equal to the length clew down</U>                                               </div> <bR> <div> <IMG SRC="133260e0.jpg" border=0 width="550" height="270" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <div> the yellow line's are fictional lines that runs from the gore then 90 degrees over to the atherside of the panel to give you the exact markingplace for making the closing line (the foot of the sail)which make's the triangular complete.</div> <bR> <div>  the line in the X panel this  has  same angle aswel in the ruff as in the exact calculations </div> <bR> <bR> <bR> <bR> <bR> <bR> <bR> <bR> </td> </tr></table></body>