Commercial fishing I had a steadying sail with a surface area of about 25% of the side profile. It made a worthwhile difference on a 55' round bottom when running. When fishing I also had flopper stoppers. When shutdown and drifting at night with the right conditions and rudder set, it would sometimes sail at about 1 knot. Enough to keep the bow into the swell. One night made about 15 miles in 8 hours across the swell, unplanned.
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