A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2016 Jul 27, 10:29 -0700
Be careful of your fellow sailboat racers for they are a tricky lot ;-) There is a penalty to tacking so fewer is generally better. Where things get complicated is when the wind shifts favoring one tack over another (see attached Wikipedea blurb). As a rule most sailboats can make good 45° to the true wind which means going 1.4 NM on two tacks to make good 1 NM directly toward the mark. Another factor to keep in mind will be speed through the water vs. speed over ground which is a function of ocean current vector sums. Down wind sailing is counter intuitive in that steering off the mark and jibbing will get you to the mark faster if there is any noticable increase in speed with a course adjustment (up to 20°).
The best book I know of on this subject is SAIL POWER by Wallace Ross.
From: Graham England
Date: 2016 Jul 27, 08:55 -0700