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-   -   Calculating Displacement Ratios (http://www.sailnet.com/forums/buying-boat-articles/19471-calculating-displacement-ratios.html)

 Tom Wood 10-14-2000 09:00 PM

Calculating Displacement Ratios

<HTML><!-- eWebEditPro 1.8.0.2 --><P>When calculating Displacement/Length ratios and Sail Area/Displacement ratios, I can never come up with the answers that appear in articles and boat builder’s literature. Can you help?<BR><BR>Vick.</P><B><P>Tom Wood responds:</P></B><P>Actually, we've already published several articles that explain those formulas, for example, Beth Leonard's <FONT color=#000000><A class=articlelink href="http://www.sailnet.com/forums/showthread.php?threadid=19382">Comparing Cruising Boats</A>&nbsp;and Randy Harman's <A class=articlelink href="http://www.sailnet.com/forums/showthread.php?threadid=20371">Choosing the Right Boat</A>.</FONT></P><P>The trouble most people run into when running these numbers is: (1) not using the correct 2,240 pounds for a long ton, (2) not using the correct 64 pounds for the displacement of one cubic foot of seawater, and (3) difficulties calculating displacement to the 2/3 power (the cubic root of displacement in cubic feet, squared), which usually takes either a high-powered scientific calculator or a lot of trial and error.</P><P><TABLE cellSpacing=0 cellPadding=0 align=center border=0><TBODY><TR><TD height=8></TD></TR><TR><TD vAlign=center><A href="http://www.sailnet.com/store/item.cfm?pid=6637"><IMG height=75 src="http://www.sailnet.com/images/content/authors/wood/101500_adtw_choosing.gif" width=320 border=0></A></TD></TR></TBODY></TABLE><P></P></HTML>

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