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Sailing question
Wayne.B wrote:
On Mon, 17 Sep 2007 09:57:15 -0400, "Reginald P. Smithers III" wrote: it is common for racing boats to sail 30 degrees into the wind. That is the so called apparent wind angle (AWA) as viewed from onboard the boat while it is moving. The true wind angle (TWA) is rarely less than 40 degrees even on a fast racing boat. The TWA on a typical cruising boat will usually be in the range of 45 to 50 degrees. The difference between AWA and TWA is caused by the boats forward motion. The most accurate way to estimate TWA without complicated instrumentation is to sail the boat first on one tack and then the other. Note the compass heading on each tack, calculate the difference and divide by two. For example if you are sailing a close hauled course of 45 degrees on starboard tack and 135 degrees on port tack, the difference is 90 and your true wind angle is approximately 45 degrees off the bow. Using the example above, the AWA would be about 35 degrees in a typical cruising boat sailing in moderate wind speeds. I stand corrected. |
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