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pointing, pinching, VMG

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17K views 68 replies 20 participants last post by  colemj  
#1 ·
Hello,

I am racing my boat in a double handed series. This is simple, casual, non-spinnaker racing (for me). I am sailing with my daughter and we're having lots of fun.

Last night we sailed in just about perfect conditions: Wind 7-10 true, flat seas. On the upwind leg I had the sails trimmed in hard. Halyard and outhaul set properly (IMHO). I had the upwind mark programmed into my plotter (B&G Vulcan), I was displaying SOG and VMG to the mark.

I noticed that VMG was highest when it felt like I was pinching. SOG would decrease but VMG would increase. The inner tell tails on the headsail were fluttering. The heasail was in all the way, the cars were set right too (even break of the tell tails from top to bottom.

I definitely felt like I was pinching and if I headed down a little the SOG would increase and the telltails looked better but the VMG decreased.

So, am I best off trying to maximize VMG or steering to the tell tails?

Thanks,
Barry
 
#62 ·
Done a lot of racing. Upwind depends a lot on the wind, boat seas etc, Not reduced to a number rather winners have a sense for the boat. Hard describe. In heavy winds you may want to feather up. When the boat feels sluggish you may want to slacken off. The best learning I got was from an old salt who has us kids sail blindfolded.
 
#63 ·
We have also used blindfold (well closed eyes to be more accurate) technique in NSW Heron Dinghys junior training camps for teenagers about 2000 to help them develop feel, also teaching them to change direction by changing trim of sails, eg mainsheet on harder and jib softer to go more to windward, main softer and jib harder to steer to leeward. Many also say that the best car racing drivers start young in go karts and develop a feel through the seat of the pants.
 
#67 ·
I know nothing about the Vulcan plotter, but on our B&G Tritons, VMG is a configurable datum for a variable in a display page. B&G software tends to be very similar across devices, so I suspect you have the same ability. Is there a data box available where you can choose which data to show?

Mark
 
#68 ·
Yes, optimize VMG.

The exception is if you are not sailing dead to windward. In that case, the best VMG will be slightly different on each tack (look at the polar).

The computer will tell you the best VMG dead up wind. But as Joshamee Gibbs said "But we're not trying to find north (sail dead up wind) are we?"