NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Wind & Current Navigation
From: Fred Hebard
Date: 2003 Apr 16, 23:26 -0400
From: Fred Hebard
Date: 2003 Apr 16, 23:26 -0400
Dan, It's always nice to see problems posed on which one can ruminate. We have a full moon tonight, which will increase tides. I believe the tides also are increased by being near the equinox. So you may have experienced much more tide than you usually encounter, although so soon after low tide is puzzling. The wind pushing you sideways is resisted by the keel(s) of the boat quite a bit, whereas nothing resists the current, to a first approximation. Also, you boat is not a perfect sail, as Peter Fogg pointed out. Perhaps one of the engineers lurking near will enlighten us on the efficiency of various types of sails. When you are first getting underway, you have not had an opportunity to evaluate the effect of the various forces pushing on your boat, so it is more difficult to compensate. I can nervously envision that sinking feeling as you were set in towards that pier with very little you could do to get yourelf away. Perhaps throwing a bit of chaff into the water in the future would be enlightening, or looking at the water swirl around an anchor chain or some such. The orientation of free-swinging boats at anchor relative to wind direction might also be helpful. Fred