UPWIND RACING IN VENUE WITH ROTARY CURRENTS
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ADVANTAGE RACING QUIZ OF THE MONTH ...
UPWIND RACING IN VENUE WITH ROTARY CURRENTS |
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| Rotary currents do not pass through zero at minimum and then reverse direction, but rather decrease to a non-zero minimum and then increase in a different direction, often at right angles to the original flow. This is common in U.S. venues such as San Francisco Bay, and in the 2008 Olympic venue. The left panel below shows the boat at the beginning of an upwind leg to mark "54", at a time when there is an opposing current of 0.5 knots (shown by the blue streamers). During the next 90 minutes, the current will increase to 2.5 knots and shift direction by 60 degrees. The time to reach the mark is approximately 30 minutes, at which time the current pattern will be as shown in the right panel. | |
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| QUESTION: WHAT IS THE OPTIMAL UPWIND ROUTE TO REACH THE MARK (left side of course, right side, up the middle, or something else) ? ? ? | |
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