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Dulcinea is hull 17 of the 37 Swan that dominated ocean racing in 1970-71. With her pronounced tumblehome and low windage profile, Dulcinea is a beautiful Sparkman & Stephens design with Nautor heirloom quality. She has the classic S&S lead fin keel and skeg rudder that provides excellent upwind performance and fast, sea kindly passage making. Her provenance is well-known and documented. She has been in the fresh water U.S. Great Lakes since 1984. Since 2000 she has been extensively upgraded by her current owner for shorthanded sailing, including a Dacron mainsail by North Sails (new 2019), North Marathon 3DL #1 genoa (2016), North asymmetrical spinnaker (2007), two pairs of self-tailing chromed bronze primary winches (one pair at the helm) and four chromed bronze self-tailing halyard winches, boom with three (3) reefs & new gooseneck (2002), all new Type 316 stainless standing rigging (2002), all new running rigging (2007-2019), massive below-deck Raymarine hydraulic autopilot (2003) with backup (2017), end-boom sheeting to a Harken traveler (2006), all new AC, DC, coax, and instrument wiring (2004-2019), five batteries (2015-2017), Balmar high-output alternator (2012) and smart regulator (2009), Raymarine ST60 instruments (2000-2010), lifelines (2002), 3-blade feathering MaxProp (2006), Ultrasuede upholstery (2017). No teak decks. And the list goes on….Lying Chicago.
Equipment: Text me or email me with your email address for a copy of the full list of the upgrades accomplished since 2000.
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
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