Downwind polar diagram to determine velocity made good at various wind speeds for a hypothetical displacement sailboat and sail plan. The blue and red dots denote the optimum downwind velocity made good (VMG) for each wind speed. For example, for a windspeed of 10 kts, optimum VMG is almost 6 kts on a course of 150°, whereas for a windspeed of 20 kts, optimum VMG is almost 8 kts on a course of 174°. After <cite class="book" style="font-style:normal">Textor, Ken (1995)      <i> <a rel="nofollow" class="external text" href="https://books.google.com/books?id=2JIbS0c1XPwC&amp;pg=PA50&amp;dq=downwind+sailing&amp;hl=en&amp;sa=X&amp;ei=LoggVeSSCsvlsAX2oIDICA&amp;ved=0CB4Q6AEwAA#v=onepage&amp;q=downwind%20sailing&amp;f=false">The New Book of Sail Trim</a></i>, Sheridan House, Inc., pp. 228  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/0924486813" title="Special:BookSources/0924486813">0924486813</a>. </small></cite>, pp. 52-3.
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