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From: Albin43SDtr (no email)
Date: Fri May 25 2007 - 13:52:38 EDT
'Lo All,
My old sailboat, before I built the interior, which brought the bow
way down (reducing bow windage), used to hunt like a cheetah on the
savannah if anchored on a single line (two anchors spaced at about
40-60 degrees stopped all hunting). Any boat that has the center of
wind resistance forward of the center of lateral resistance will hunt
to some extent. This is because the center of lateral resistance is
the point where the boat moves sidewise without turning when that
point is pushed. The center of wind resistance is the point where the
wind force is centered. The greater the distance, the more violently
it will hunt (all factors considered for that specific boat). The
more windage relative to lateral resistance, the more violently it
will hunt. This is why "riding sails" are put on sailboats. They are
very effective, and were especially effective on our old sailboat.
I did find that if I rigged a bridle, setting a snatch block on the
anchor rode and adjusting the bridle line with a main sheet winch, by
shortening the bridle line, I could keep the bow from passing through
what would be a straight line from the anchor, center of wind
resistance, and the center of lateral resistance, thus stopping the
incessant hunting. This essentially held the boat in a
non-streamlined condition, laying on one tack. The greater the wind,
the greater the angle of tackrequired to stop the hunting. Of course,
it also significantly increased the load on the anchor. I did not
like this arrangement and quickly adopted a two rode anchoring
scheme, then ultimately made a riding sail.
The Celestial does not hunt, fortunately. That is one advantage to
having the dinghy stored on top of the sundeck roof as well as the
overall shape of this type vessel (full length keel, long aft cabin).
When bringing her home after purchasing her, on our 2nd night aboard,
as usual, I got up in the middle of the night to check the anchor and
all and was astonished to find 2-3' waves running past us, but the
Celestial was serenely sitting with no real discernable movement. It
was quite noisy outside, but in the aft-cabin, all was quiet. :)
The advantage of a bridle, from my experiences, is to use it as an
anchor rode snubber, and forget any real hope of it stopping the
hunting tendency.
Just thinking out loud.... YMMVVG
Take care and be safe.
Wayne
M/V Celestial
Albin43 Sundeck
Panama City, FL area
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