June 20, 2005

Summer Series 1,2,3

K and I did some practicing for the upcoming North Americans in Huntington Lake, Ca. Here's the plots for the three races:
We had very light winds for the first race; it died out on us during the downwind. There was only one data point taken by the GPS over a distance of 2500 yards and it indicated we had a speed of about 1 knot.

061805_1.gif
for the second and third races the sea breeze filled in and we had some good races.

Race 2
061805_2.gif

Race 3
061805_3.gif

Summer Series Race 3leg1leg2leg3leg4
start time13:20:3513:26:3813:30:1113:35:31
finish time13:26:3813:30:1113:35:3113:39:48
elapsed0:06:030:03:330:05:200:04:17
hours0.1008330.0591666670.08888890.071389
nm0.2930.2780.2770.292
mean vmg2.9057854.6985915493.116254.090272
mean speed4.9325.2364.7174.679
mean angle53.9018926.1864462248.6511189629.05232

I tried an experiment during the last race. I intentionally sailed a larger angle to the mark than I normally do on the last downwind leg. The wind speeds were relatively the same during this race and I wanted to see how that affected the performance of the boat. From what I can tell, the hotter angle seems to have been a good thing. We were 44 seconds faster, and our VMG was 0.6 knots faster, which is a huge difference. I want to repeat the experiment and see if we can't duplicate this result. We didn't have much traffic around us; so if we were sailing in a large fleet that could have caused us trouble. That's what makes this game so interesting. Change the number of boats in the fleet; or change the weather conditions even slightly and the outcome can be totally different.

Posted by Bob at June 20, 2005 09:30 PM