VMG rules! Make sure you understand the difference between VMG (wind based) and VMG (ground based or GPS based).
VMG wind is what you want when racing windward/leewards. It's VMG directly upwind or downwind. VMG that you see on a GPS is actually WCV (Waypoint Closure Velocity). It's the speed at which you are approaching or closing on the waypoint. If you set the windward or leeward mark as the waypoint, WCV will tend to zero as you approach the layline. If you want to approximate VMG wind in your GPS, set a waypoint 20+ miles directly past the mark. That is, if the upwind mark is set at 180 degrees, 2 miles, set a waypoint at 180 degrees 22-25 miles. Dennis C. Touche' 35-1 #83 Mandeville, LA On Thu, Sep 4, 2014 at 8:29 AM, Josh Muckley via CnC-List < [email protected]> wrote: > Yeah I got my but kicked during a fun race because of VMG downwind. I > knew it and was avoiding dead down by keeping the wind at 120° but the > other guy was keeping the wind closer to 90°. It just didn't look right > being that far off course but he beat me across the line by a very wide > margin AND he rated 168 to my 75. Ugh! > > Josh > On Sep 4, 2014 8:54 AM, "Jean-Francois J Rivard via CnC-List" < > [email protected]> wrote: > >> On the Wing and Wing thing I'm with Josh. I don't have a whisker pole >> and I discovered that using the method Josh described it's actually pretty >> easy to keep the 135% jib full without a pole. I'm on a lake without >> swells so a preventer is not really needed, just keeping a close eye on the >> sails / helm / wind gauge does the trick. >> >> However.. If you want to go fast down wind without a spin you're very >> likely to be better off going broad reach and gybing. It's more work but >> VMG does not lie. I've tested it in racing situations and even on pretty >> short legs it's faster as long as you respect the laylines.. This will >> become clearer if you can check your boat's polars. ( if you can find them) >> >> You can read-up on VMGon these sites: >> <http://www.oceansail.co.uk/Articles/VMGArticle.html> >> <http://www.oceansail.co.uk/Articles/VMGArticle.html> >> http://www.oceansail.co.uk/Articles/VMGArticle.html >> http://sail.navas.us/why-vmg-matters.html >> >> Here's a VMG app for your phone: >> http://www.sailracer.net/application/downwind.php >> >> Here's an explanation on polars: >> http://features.boats.com/boat-content/2013/09/sailing-101-understanding-polars-through-animation/ >> >> Have fun learning the finer points of sailing.. >> >> >> Regards >> >> Francois Rivard >> 1990 34+ "Take Five" >> Lake Lanier, Georgia. >> >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> >> Email address: >> [email protected] >> To change your list preferences, including unsubscribing -- go bottom of >> page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >> >> >> > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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